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Issue 1, Volume 4,
January 2009
Title of the Paper: Metal Chamber
Temperature Control by Using Fuzzy PID Gain Auto-tuning Strategy
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Authors: Shiuh-Jer
Huang, Yi-Ho Lo
Abstract: Although PID control scheme is widely employed in industrial control
systems, it is hard to search the model-free appropriate control gains for
achieving good dynamic performance. The selected constant PID control gains
can not achieve consistent control accuracy for different temperature setting
points or testing runs. In addition, the temperature control system has
nonlinear time-delay, time-varying, slow response speed and one-way control
input characteristics, it is also difficult to accurately estimate the dynamic
model for designing a model-based general purpose temperature controller to
achieve good control performance. Recently, temperature is become an important
production control parameter in chemical and semiconductor industry. How to
design an appropriate gains auto-tuning control strategy for achieving
accurate temperature control accuracy has become an interesting research
topic. Here two model-free auto-tuning PID and fuzzy PID control strategies
are introduced to design a general temperature controller for different
plants. The designed temperature control plants have heater control phase only
without cooling control function. The experimental results show that these
control schemes can obtain reasonable control performance. The steady state
error of the step input response is less than 0.2 without overshoot. The
setting point dynamic response behaviour is better than that of the
model-based IMC-PID due to the modelling uncertainty and modelling error.
Keywords: Temperature
control, gain auto-tuning, fuzzy PID and one-way control input
Title of the Paper: On the Modelling
and Controller Design for the Outpouring Phase of the Pouring Process
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Authors: M. P. Tzamtzi,
F. N. Koumboulis, M. G. Skarpetis
Abstract: The present work contributes towards modeling and control of the
outpouring phase of a pouring process, where the liquid container is carried
by a robotic manipulator. The dynamics of the liquid motion are approximated
by the well-known pendulum-type model, where the length and the mass of the
pendulum vary with time due to liquid outpouring. The dynamics of the liquid
transfer structure, including the carrying manipulator, the container and the
liquid, are approximated by the dynamics of a robotic structure that
incorporates virtual prismatic joints and corresponding weightless links to
represent variations of the liquid level and corresponding variations of the
pendulum length within the tank. The performance of a two stage control design
scheme on the control of liquid outpouring and the suppression of liquid
sloshing during the outpouring phase of the pouring process is studied for the
derived model using simulation results. The designed scheme combines a partial
inverse dynamics controller with a PID controller, tuned with the use of a
“metaheuristic” search algorithm. Both controllers have been designed for a
nominal model, ignoring the loss of liquid’s mass due to outpouring.
Keywords: Robotic
applications, Robot Control, Nonlinear Control, Pouring Process, Sloshing
Control
Title of the Paper: An Application of
Fuzzy Delphi and Fuzzy AHP for Multi-criteria Evaluation on Bicycle Industry
Supply Chains
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Authors: Jao-Hong Cheng,
Chih-Huei Tang
Abstract: Under global saving energy and carbon wave and increasing incomes,
the bicycle not only is a traditional transportation but also has become a
tour and sport tool. Concerning the bicycle industry, the prior researches
worked on analyzing bicycle tire suppliers and focused on the business
strategy and cost analysis. Therefore, the purpose of this study is to
identify critical factors related to the bicycle supplier selection. Primary
criteria to evaluate supplier selection is obtained by the literatures survey
and applying fuzzy Delphi method (FDM), and then fuzzy analytic hierarchy
process (FAHP) is employed to calculate the weights of these criteria, so as
to build the fuzzy multi-criteria model of bicycle supplier selection. The
results indicate a greatest weight on the dimension of bicycle supplier
selection, and four critical evaluation criteria related to bicycle supplier
selection are delivery time, service quality, optimum price, and product
quality.
Keywords: Bicycle
Industry, Supply Chain, Analytic Hierarchy Process (AHP), Fuzzy Delphi Method
(FDM), Fuzzy Analytic Hierarchy Process (FAHP)
Title of the Paper: The Structure of
Modular Walking Robot MERO Displacement Systems, Support of the Heavy Load
Transportation
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Authors: Ion Ion, Luige
Vladareanu, Ion Simionescu, Aurelian Vasile
Abstract: The modular constructions of the walking robots led to a more
suppleness and very good adaptation to any terrain surface. Some of the most
significant components of the walking robots are the mechanisms of the
displacement systems. The design of the leg mechanisms implies the solving of
several problems regarding the static stability, the forces distribution,
balancing of the gravitational forces in order to diminish the power
consumption, optimization of the foot sole shape, optimization of the
kinematic dimensions of the leg etc The advantages of legged system for
off-road have been gradually recognised. One of the most important advantages
is mobility. The Modular walking robots represent a special category of
robots, characterized by having the power source embarked on the platform. The
weight of this source is an important part of the total charge that the
walking robot must transport. That is the reason why the walking system must
be designed so that the mechanical work necessary for displacement, or the
highest power necessary for act it, should be minimal A modular walking robot
can traverses most natural terrain. Walking robots better protect the
environment, as their contact to the ground is discrete, which considerably
diminishes the area underwent to crushing; the robot’s weight can be optimally
distributed all over the supporting surface, by controlling the forces.
Altering the distance to the ground, the robot can pass over young trees or
other vegetation, growing in the passage area.
Keywords: Modular Walking
Robot, Static Balancing, Shifting System ,Legs, Stability margin
Title of the Paper: Voltage-Dependent
Parameter Refinement for Single-phase Induction Motors using Genetic
Algorithms
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Authors: N. Naewngerndee,
T. Kulworawanichpong
Abstract: This paper presents a genetic-based approach to correct the
parameters for single-phase induction motors in various supply voltage levels.
From conventional tests, electrical (resistances and inductances) and
mechanical (moment of inertia and damping coefficient) parameters of the
stator and the rotor can be estimated. The set of obtained parameters is able
to apply for steady-state performance analyses. In transient states, motor
responses generated by these parameters are not met the condition of
acceptable accuracy. By some efficient search method incorporate with
experimental data, the obtained parameters can be refined to yield the best
curve fitting in both transient and steady-state responses. A 0.37-kW, 220 V,
50 Hz single-phase induction motor was used for test to verify the
effectiveness of the proposed algorithm. Furthermore, with six different motor
supply voltages, voltage-dependent parameters of single-phase induction motors
can be established. As a result, the voltage-dependent parameters of the
induction motors can be satisfactorily improved to represent the motor dynamic
in various supply voltages.
Keywords: Single-phase
induction motor, Space-phasor model, Voltage-dependent parameter, Genetic
algorithm, Retardation test, blocked-rotor test, No-load test
Title of the Paper: High Accurate
Positioning Technique for AUV
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Authors: Tain-Sou Tsay
Abstract: In this paper, a high accurate positioning technique is proposed for
autonomous underwater vehicle(AUV). It needs not position correction from
Global Position System (GPS) above the sea surface and short- or long-baseline
acoustic positioning system(SBL or LBL) under the sea. Two long time
experiments gave maximal and average deviations are less than 33.6m and 15.1m;
respectively. Position deviations are verified by tracking datum of a
long-baseline acoustic position system with post navigation processing datum.
These deviations are much less than the tracking range of sonar. High accurate
positioning results let vehicles have less supporting from launching vessel
and give flexible and mobile operations.
Keywords: Position
estimation, Navigation and guidance, Autonomous underwater vehicle
Issue 2, Volume 4,
February 2009
Title of the Paper: Transformation
of a Production/assembly Washing Machine Lines into a Lean Manufacturing
System
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Authors: E. Romano, L.
C. Santillo, P. Zoppoli
Abstract: The scope of this work is the complete re-organization of production
flow according to the Lean Thinking philosophy for the industrial
applications. The complete re-organization implementation of material flow
management has been performed through the supermarket sizing which
replenishment kanban logic has been adopted. To implement this strategy the
goal is to achieve "Interdependent connected Processes" adopting the Pull
System methodology in the Just in Time production environment. From the narrow
sense the JIT manufacturing philosophy is to produce the right quantity at the
right time with the right quantity level. In JIT the production is triggered
by a kanban signal, which comes from the costumer order or the master
production schedule, the signal then flowing backwards. By implementing JIT
concepts in manufacturing, many of the practitioners experience advantages
such as shorter lead times, fewer inventories, and higher quality. In the case
study, developed in the Whirlpool Europe Naples factory, we have a first stage
that consists of sizing the amount of "Kanban reintegration" codes, and the
second stage in which we have simulated with ARENA and verified the progress
of production flow in the hypothesized system, that has underlined the
improvement of the business performances and great flexibility.
Keywords: Pull system,
kanban, simulation, supermarket pull, Sequential Learning, pattern production
schedule
Title of the Paper: System
Approach to Synthesis, Modeling and Control of Complex Dynamical Systems
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Authors: Armen G.
Bagdasaryan
Abstract: The basic features of complex dynamical and control systems,
including systems having hierarchical structure, are considered. Special
attention is paid to the problems of synthesis of dynamical models of complex
systems, construction of efficient control models, and to the development of
simulation techniques. An approach to the synthesis of dynamic models of
complex systems that integrates expert knowledge with the process of modeling
is proposed. A set-theoretic model of complex system is defined and briefly
analyzed. A mathematical model of complex dynamical system with control, based
on aggregate description, is also proposed. The structure of the model is
described, and architecture of computer simulation system is presented,
requirements to and components of computer simulation systems are analyzed.
Keywords: Systems,
complexity, dynamics, modeling, control, simulation, computer simulation
system
Title of the Paper: NN-based
Algorithm for Control Valve Stiction Quantification
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Authors: H. Zabiri, A.
Maulud, N. Omar
Abstract: Control valve stiction is the most commonly found valve problem in
the process industry. Quantification of the actual amount of stiction present
in a loop is an important step that may help in scheduling the optimum
maintenance work for the valves. In this paper, a Neural-network based
stiction quantification algorithm is developed. It is shown that the
performance of the proposed quantification algorithm is comparable to other
method whereby accurate estimation of the stiction amount can be achieved even
in the presence of random noise. Its robustness towards external oscillating
disturbances is also investigated.
Keywords: Control valve,
stiction, neural network, quantification
Title of the Paper: Petri
Nets and Fuzzy Sets in Hybrid Controllers Synthesis: The Discrete-Event Aspect
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Authors: Lucien Ngalamou,
Leary Myers
Abstract: This paper presents a design approach intended for the modeling and
synthesis of discrete-event modules of hybrid controllers by combining a model
of computation and a soft computing synthesis approach. The model of
computation is based on coloured Petri nets (CPNs) and the soft computing
method uses fuzzy logic. The design approach converts Petri net models into
their equivalent fuzzy sets for rapid prototyping on embedded controllers or
programmable Logic devices. The Petri net model of a discrete-event controller
is captured and modeled using DesignCPN software tool whose latest version is
called CPNTool. Design/CPN (CPNTool) uses colored Petri nets (CPNs) in model
representation. Fuzzy sets generated in the conversion process are compatible
inputs (fuzzy sets) to the Xfuzzy software, which is a fuzzy logic software
for the design of fuzzy controllers. Xfuzzy can generate equivalent C and VHDL
codes from fuzzy sets.
Keywords: Model of
computation, coloured Petri nets, soft computing, fuzzy sets, and
discrete-event controller
Issue 3, Volume 4,
March 2009
Title of the Paper: Numerical
Simulation of a Flexible Plate System for Vibration Control
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Authors: A. R.
Tavakolpour, I. Z. Mat Darus, M. Mailah
Abstract: This research presents an investigation into the numerical
simulation of a flexible thin plate using Finite Difference (FD) and Finite
Element (FE). Based on the FD method, an appropriate model of a thin plate was
derived and its corresponding natural frequencies were estimated. Then, FE
modeling of the plate system was implemented using the ANSYS software and the
corresponding modes of vibration were computed by modal analysis. The obtained
vibration modes for both models were then evaluated and compared. A number of
attempts have been carried out to determine the nodal lines on the plate in
order to identify the critical observation points for appropriate locations of
the sensors using the FE simulation. Finally, the effectiveness of FD method
for real time application was verified by comparative assessment of the
obtained natural frequencies with the exact value reported by other
researchers. The FD method was found to be the better choice than FE method to
model a plate structure for real-time active vibration control.
Keywords: Finite
Difference, Finite Element, Flexible Plate, Active Vibration Control, Dynamic
Modeling
Title of the Paper: Space Vector
Double Frame Field Oriented Control of Six Phase Induction Motors
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Authors: M. Kamari, M.
Keramatzadeh, R. Kianinezhad
Abstract: In this paper a new rotor field orientation control of six phase
induction machine is proposed. The machine has two three phase windings
spatially shifted by 30 electrical degrees. The dynamic model of the machine
is based on the three two dimensional orthogonal subspaces. The proposed
method uses a simple estimator for identifying rotor flux and its orientation.
To eliminate the extra harmonic currents of stator windings that produce
losses, space vector PWM technique and double synchronous frame current
controller is employed. The simulation results illustrate the validity and
efficiency of the proposed method.
Keywords: Six-phase
induction machine; Vector control; Space voltage modulation
Title of the Paper: The Algorithm
of Obstacle Avoidance based on Improved Fuzzy Neural Networks Fusion for
Exploration Vehicle
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Authors: Shunming Li,
Jianghui Xin, Weiyan Shang, Shen Huan, Wenqing Xiu
Abstract: In order to improve the vehicle steering stability, and avoid the
obstacles fast and accurately, the fuzzy neural networks has been developed,
in detail introduced this algorithm control principle. Advance control
algorithm usually needs much more prior knowledge and depends on the accuracy
model of process. However, fuzzy logic control technology is applied to
control the plants having fuzzy, uncertainty, high-order, heavy lag without
accurate mathematics model. The neural network has the advantage of
self-learning, memory ability, fault-tolerant and parallel processing etc. The
back propagation neural network was taken as framework, combining an improved
fuzzy control algorithm, to realize the fuzzy-neural control of the
exploration vehicle’s navigation. It can use the improved fuzzy theory and
neural networks together to form an improved fuzzy neural networks control
system. So it can auto pick-up the fuzzy rule and build the subordinate
function, it’s self-organizing and self-learning the control knowledge which
is needed for steering process and precise obstacle avoidance. The result of
simulation analyses indicate that the method proposed in the paper can achieve
safe and stability in steering control of obstacle avoidance of exploration
vehicle.
Keywords: Fuzzy neural
networks, obstacle avoidance, exploration vehicle, steering stability, pattern
matching, path planning
Title of the Paper: Tension Robust
Control Strategy Based on Self-Optimizing Algorithm
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Authors: Jinbao He,
Yongyi He, Shuai Guo, Minglun Fang
Abstract: In tension systems, the main concern is to decouple the tension and
velocity in spite of radius variations and other perturbations. To solve this
control problem and design the optimal controller, this paper develops a
mixed-sensitivity robust H∞ control based on self-optimizing algorithm. First,
the modeling of the tension system is presented with relative theorems.
Second, a mixed-sensitivity robust H∞
control which reduces the coupling between tension and velocity is compared to
PID controller. But the H∞
controller is conservative, the H∞
controller method with parameter fuzzification is introduced. At low velocity,
the H∞
control method with parameter fuzzification gets fine results. However, for
the high velocity and real time requirements of tension system, the H∞ control
method with parameter fuzzification cannot keep the controller optimal always.
Therefore the tension robust control strategy based on self-optimizing
algorithm is proposed. The controller is optimized by hyper generation GA (HGGA)
which reduces computing time. Furthermore, the current error and the change of
the error are turned to compensate time delay. In order to test the
effectiveness of the proposed algorithms, the tension experiment platform
analog system is developed based on DSP (TMS320LF2407A) board. Finally the
algorithms in this paper are tested in tension system platform, and the
feasibility has been verified.
Keywords: Tension system,
robust control, parameter fuzzification, genetic algorithm (GA), hyper
generation GA (HGGA), time delay, DSP
Issue 4, Volume 4,
April 2009
Title of the Paper: Pseudo-Equivalence
of Fuzzy PID Controllers
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Authors: Constantin
Volosencu
Abstract: This paper presents a pseudo-equivalence of digital fuzzy PID
controllers with linear PID controllers in the continuous time domain.
Transfer functions and equivalence relations between controller’s parameters
are obtained for the common structures of the fuzzy PID controllers. The
pseudo-equivalence is made using a graphic analytical analysis based on the
input-output transfer characteristics of the fuzzy block, the linear
characteristic of the fuzzy block around the origin and the usage of the gain
in origin obtained as an origin limit of the variable gain of the fuzzy block.
An algorithm of equivalence is presented. The paper presents a unitary theory,
which may be applied to the most general fuzzy PID controllers, developed
using all kind of membership functions, rule bases, inference methods and
defuzzification methods. The term “pseudoequivalence” is emphasized because
there is no straight equivalence between the non-linear fuzzy controllers and
the linear PID controllers. A case study of a control system using linear and
fuzzy controllers is presented. The action mode of the fuzzy controller is
analyzed. Based on the transient characteristics a comparison analyses is
done. Better control quality criteria are demonstrated for control systems
using fuzzy controllers.
Keywords: Fuzzy logic,
control systems, PID controllers
Title of the Paper: Identification of
the De-synchronization, Synchronization and Forced Oscillation Phenomenon of a
Nonlinear System
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Authors: Marius-Constantin
Popescu, Onisifor Olaru, Valentina Balas
Abstract: The phenomena of de-synchronization, synchronization, and forced
oscillation has been investigation using describing function theory for a two
input and two output nonlinear system containing saturation-type
nonlinearities and subjected to high-frequency deterministic signal for the
purpose of limit cycle quenching. The analytical results have been compared
with the results of digital simulation Matlab-Simulink for a typical example
varying the nonlinear element.
Keywords: Signal
stabilization, Limit cycle, Forced oscillation, Dither, Saturation
Title of the Paper: An Approach to
Fault Diagnosis of Rolling Bearings
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Authors: A. A. Roque, T.
A. N. Silva, J. M. F. Calado, J. C. Q. Dias
Abstract: The present paper aims to demonstrate why usually when theoretical
mathematical models are used to compute the frequencies corresponding to a
faulty rolling bearing a deviation is obtained between the computed values and
the real frequencies emitted by such a device. A laboratory rolling bearing
test ring has been developed to perform the current studies. From the obtained
results we highlight the impact of the cage rotation frequency on the referred
deviation of measured values from the theoretical ones.
Keywords: Fault detection,
Fault isolation, Fault diagnosis, Rolling bearing, Condition based maintenance
Title of the Paper: Dynamics and Flight
control of the UAV Formations
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Authors: Teodor-Viorel
Chelaru, Valentin Pana, Adrian Chelaru
Abstract: The purpose of this paper is to describe the flight of an Unmanned
Aerial Vehicles (UAV) formation by using a 6 degrees of freedom (6 DOF)
models. The problem of flight formation will be approached in a simple manner,
by using a 3 DOF models, as well as using the complex equations that describe
the movement of the 6 DOF for UAV. This theoretical development allows us to
define a control structure based on direct commands, which is useful in
practical applications. The work will present and analyze the calculus results
for each developed solution. The novelty of this paper consists in the
definition and testing of some practical solutions for an algorithm that can
control an UAV formation. This algorithm allows decrypting the flight of a
single UAV, as well as the entire formation. The conclusions will focus the
practical possibility of implementing such algorithm on a UAV formation.
Keywords: UAV, Flight,
Formation, Dynamic, Control
Issue 5, Volume 4,
May 2009
Title of the Paper: Control of a
Radiative Furnace under Precise and Uncertainty Conditions
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Authors: Peyman Nazarian
Abstract: This paper discusses the control of a radiative furnace under
precise and imprecise modeling. Regarding nonlinearity nature of the process,
in the precise case, feedback linearization technique is applied to the
furnace and under uncertainty conditions, sliding mode control is used. The
conditions are completely practical and have gained from an industrial
process.
Keywords: Feedback
Linearization – Radiation – Furnace – Uncertainty – Sliding Mode Control
Title of the Paper: A Unified Approach
for Sensitivity Design of PID Controllers in the Frequency Domain
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Authors: Tooran Emami,
John M. Watkins
Abstract: In this paper a graphical technique is introduced for finding all
continuous-time and discrete-time proportional integral derivative (PID)
controllers that satisfy an H? sensitivity constraint of an arbitrary order
transfer function with time delay. These problems can be solved by finding all
achievable PID controllers that simultaneously stabilize the closed-loop
characteristic polynomial and satisfy constraints defined by a set of related
complex polynomials. A key advantage of this procedure is that it only depends
on the frequency response of the system. The delta operator is used to
describe the controllers, because it not only possesses numerical properties
superior to the discrete-time shift operator, but also converges to the
continuous-time controller as the sampling period approaches zero. A unified
approach allows us to use the same procedure for discrete-time and
continuoustime H? sensitivity design of PID controllers.
Keywords: Sensitivity
design, frequency response, delta domain, PID controllers, and time delay
Title of the Paper: Robust Performance
Characterization of PID Controllers in the Frequency Domain
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Authors: Tooran Emami,
John M. Watkins
Abstract: In this paper a method is introduced for finding all proportional
integral derivative (PID) controllers that satisfy a robust performance
constraint for a given single-input-single-output transfer function of any
order with time-delay. This problem can be solved by finding all achievable
PID controllers that simultaneously stabilize the closed-loop characteristic
polynomial and satisfy constraints defined by a set of related complex
polynomials. A key advantage of this procedure is that it only depends on the
frequency response of the system and does not require the plant transfer
function coefficients. If the plant transfer function is given, the procedure
is still appropriate. The ability to include the time-delay in the nominal
model of the system will often allow for designs with reduced conservativeness
in the plant uncertainty and an increase in size of the set of all PID
controllers that robustly meet the performance requirements.
Keywords: Robust
performance, frequency response, PID controllers, and time-delay
Issue 6, Volume 4,
June 2009
Title of the Paper: Multiple Method
Switching System for Electrical Appliances using Programmable Logic Controller
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Authors: S. K.
Subramaniam, S. H. Husin, S. A. Anas, A. H. Hamidon
Abstract: Smart switching system is designed for smart home control
applications. The system uses real time programmable logic controller (PLC)
for switching the electrical appliances. Electrical appliance is a part of our
daily needs for mankind. When such needs are in a very high demand, the user’s
requirement is also increasing to access their electrical appliances in a more
flexible way and also safer to use. The system is capable of switching any
electrical appliances manually, preprogrammed and remotely. The most common
practice in our daily life’s is manual switching. Manual switching is done
with human access according to instant needs. The second method in this system
is preprogramming method which allows the users to program the usage of
certain electrical appliances in advance or repetitively. Such function can be
used on daily, weekly, monthly and even yearly basis based on the requirements
of the user. The third method in this system is remote switching where the
users are capable of sending Short Messaging System (SMS) to switch ON and OFF
their electrical appliances using mobile phones. Global System for Mobile
Communication Modulator and Demodulator (GSM Modem) enables SMS commands to be
received to the PLC. The applications of technology have seen many new
intelligent systems overwriting the conventional method to ease human life in
many ways. Many systems are designed to be flexible for the users and enable
them to communicate for the latest status of their electrical appliances at
any time. Such applications will be practical and benefits for both the
domestic and industrial users from various level of electrical applications
without boundaries.
Keywords: Smart home,
smart switching system, intelligent controller, Short Messaging System,
Programmable Logic Controller
Title of the Paper: Speed Control of
Double Stator Synchronous Machine Supplied by two Independent Voltage Source
Inverters
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Authors: Nazih Moubayed
Abstract: In high power applications, power division methods for AC high power
converters and machines are used. The rated power of the elementary converters
and/or machines becomes lower when the number of converters and/or machines
increases. Therefore, power switches with high switching frequency can be
used. Then, the current and torque ripples would have theoretically lower
amplitude. The speed control of a double stator synchronous machine supplied
by two independent voltage source inverters, which is an application of power
division, is studied in this paper. After presenting the system under
consideration, three strategies of current control are treated. The speed
control method is also discussed.
Keywords: Multi-converter,
double stator machine, power division, current and speed control
Title of the Paper: Using the Black-Box
Approach with Machine Learning Methods in Order to Improve Job Scheduling in
GRID Environments
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Authors: Daniel Vladusic
Abstract: This article focuses on mapping jobs to resources with use of
off-the-shelf machine learning methods. The machine learning methods are used
in the black-box manner, having a wide variety of parameters for internal
cross validation. In the article we focus on two sets of experiments, both
constructed with a goal of congesting the system. In the first part, the
machine learning methods are used as assistants for the base resource
selection algorithms, while in the second part, they are used to directly
select the resource for job execution. We set up two experiments with
different objectives. In the first experiment, the objective was to maximize
the number of jobs finished within the deadline, while in the second
experiment, the objective was to minimize the job tardiness. Finally, in the
first part we were changing resource selections of simple job dispatching
algorithms, while in the second part, we were employing the optimization
scheme of the ALEA algorithm [15]. The results show that even with a such
black-box approach of the off-the-shelf machine learning methods, we can
achieve improvements or at least get comparable results.
Keywords: Scheduling,
distributed systems, GRID, dispatching jobs in GRIDs, machine learning
Issue 7, Volume 4,
July 2009
Title of the Paper: Applying
Intelligent Fuzzy Control to Reduce Hysteresis Effect of Force Actuator in a
SPM
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Authors: Jium-Ming Lin,
Po-Kuang Chang
Abstract: This research is to use fuzzy controller to eliminate hysteresis
effect of a force actuator for a Scanning Probe Microscope (SPM). This
improvement has been verified by MATLAB simulation and practical
implementation to reduce the hysteresis effect of the force actuator.
Comparisons with two previous designs with and without Linear Velocity
Transducer (LVT) for inner-loop feedback compensation are also made. Thus the
new system design is cheaper and valuable.
Keywords: SPM, LVT, LVDT,
Fuzzy controller, PI compensator, Force actuator, Hysteresis effect
Title of the Paper: Extended Static
Output Feedback: An H2-H1 Control Setting
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Authors: Addison
Rios-Bolivar, Francklin Rivas, Gloria Mousalli
Abstract: This contribution aims the problem about controller synthesis in H2
and H1 for linear time invariant systems (LTI), by means of the extended
static feedback of the output. The method consists of designing feedback gains
for the injection of the output and its derivatives, which corresponds to the
control signal. Conditions for the existence of such controllers are
established. The stabilization problem is formulated in the context of linear
matrix inequalities (LMI). Multiobjective Performance Indices are also
considered
Keywords: Static Output
Feedback, Robust Control, LMI, Polytopical Uncertainty
Title of the Paper: Application of
Braking/Traction Control Systems to the Scaled Active Steering Testbed in the
Railway Vehicle
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Authors: Min-Soo Kim,
Hyun-Moo Hur
Abstract: Active steering system of railway vehicles has proven its ability to
bridge the gap between stability and curve friendliness. Generally scaled
railway vehicles were developed to reproduce the fundamental dynamic behavior
of the full size railway vehicle in laboratory conditions. This paper
describes the design of the braking/traction control systems as a part of a
1/5 scaled railway vehicle for active steering testbed which is to alleviate
wheel/rail contact forces and to decrease wheel/rail wear. This system
consists of two steering actuators, a steering controller, and various sensor
systems to detect lateral displacement, vibration, track curvature, and so on.
The control strategy of the braking/traction is founded on the velocity
difference of two axle speed of the driving bogie. Running test results of 1/5
scaled active steering vehicle on the curved track show that the proposed
braking/traction control systems has good performance.
Keywords: Braking/Traction
Control Systems, Active Steering, Railway Vehicle, Scaled Model, Testbed
Title of the Paper: Fuzzy Controller
Design with the Degree of Non-uniformity for the Scaled Active Steering
Testbed in the Railway Vehicle
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Authors: Min-Soo Kim
Abstract: In urban transit systems, rail passenger vehicles are often required
to negotiate tight curves. Running curve railway, the wheelsets of
conventional vehicles generally misalign radically with the track increasing
wheel/rail contact forces and resulting in increased wheel and rail wear,
outbreak of squeal noise, fuel consumption, and risk of derailment. To solve
these problems, modified suspension system designs, application for alternate
wheel profiles, active and semi-active steering techniques have been proposed.
Active steering system has proven its ability to bridge the gap between
stability and curve friendliness. This paper presents a technique for
improving the performance of active steering fuzzy control systems by
adequately changing the widths of triangular fuzzy membership functions.
Experiment results show that the proposed fuzzy controller robustly yields
good performance comparing with conventional controller.
Keywords: Fuzzy
Controller, Degree of Nonuniformity, Active Steering, Railway Vehicle, Scaled
Model
Title of the Paper: Active Cord
Mechanism (ACM) Controller for Biologically Inspired Robots Designed with
Frequency Response Approach
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Authors: Anubhuti Saha,
R. P. Chatterjee, Sarbari Datta
Abstract: Multi-segmented robots earn some basic advantages of assembling and
disassembling of their body parts and different types of movement in a single
body structure. Snake robots can manifolds four types of motion in the surface
level using different transfer function. The main task is to derive the
transfer function of each segment that can control the snake body to navigate
with Active Cord Mechanism. Lead compensators are subject to improve the speed
of response of the snake body while lag compensators optimize its errors in
deviation while obstacle avoidance. A composite of lag-lead compensator is
discussed and examined for SUPRA Institutional Serpentine robot to be employed
in a coal mine for disaster management. The side winding movement is taken
into consideration and wireless control of snake robot is a matter of
importance. This paper holds a discussion over the controller design procedure
using frequency response approach and shows a comparison between the lead-lag
and only lag compensators with their transient and impulse responses. Finally
results are shown to support the stability analysis of the designed control
system.
Keywords: ACM, snake
robot, frequency domain approach, lag-lead compensator
Title of the Paper: Modular System for
Process Control Testing
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Authors: Ioana Fagarasan,
S. St. Iliescu, Iulia Dumitru, Nicoleta Arghira, I. Bucur
Abstract: A modular system for processes simulator and control diagram
implementation can replace a vast number of expensive systems used to
simulate, to design and to test the programming of programmable logical
control (PLC) systems graphically and practically. Different processes are
simulated and associated with different types of control application and with
different complexity factors in order to develop control algorithms and
implement them into the PLC unit. The process and control simulator is
hardware and software intergraded system for multifunctional educational
platforms that enables training and practical work. The system’s modularity
allows an easy development of the system and can be use in future development
by adding FPGA (Field-Programmable Gate Array) components.
Keywords: Electrical
process, mechanical process, system simulator, control system design, PLC
Title of the Paper: Evolutionary
Computation for Minimizing Makespan on Identical Machines with Mold
Constraints
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Authors: Tzung-Pei Hong,
Pei-Chen Sun, Sheng-Shin Jou
Abstract: This paper focuses on minimizing makespan of identical-machines
scheduling problems with mold constraints. In this kind of problems, jobs are
non-preemptive with mold constraints and several identical machines are
available. Feasible solutions are randomly generated and evolved by the
proposed approach and an adjustment operator is designed to fill up the empty
time slot due to the mold constraint. The proposed approach can also be easily
extended to solve the same problem but with the fitness function of the total
complete time. Experiments with and without the adjustment operator are made
to analyze the performance of the proposed approach. Experimental results show
that the adjustment operator does increase the performance of the scheduling.
Keywords: Identical
Machine, Evolutionary Computation, Scheduling, Makespan, Adjustment Operator
Issue 8, Volume 4,
August 2009
Title of the Paper: Theoretical and
Practical Aspects of Heating Equation
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Authors: Marius-Constantin
Popescu, Valentina E. Balas, Gheorghe Manolea, Liliana Perescu-Popescu, Nikos
Mastorakis
Abstract: We are interested in a null controllability problem for a class of
strongly degenerate heat equations. Heat equation parameters are represented
graphically (temperature, heat flux) for a particular situation. Then, first
for all T>0, we prove a regional null controllability result at time T at
least in the region where the equation is not degenerate. The proof is based
on an adequate observability inequality for the homogeneous adjoint problem.
This inequality is obtained by application of Carleman estimates combined with
the introduction of cut-off functions. Then we improve this result: for all
T`>T, we obtain a result of persistent regional null controllability during
the time interval [T,T]. We give similar results for the (non degenerate) heat
equation in unbounded domain. Analysis by numerical simulation of the heating
room space has highlighted that the use of composite materials instead of the
usual materials of construction is more advantageous in terms of achieving the
microclimate conditions, making possible, within certain limits of temperature
exterior, a passive air conditioning, which involves reducing energy
consumption.
Keywords: Representation
equations, Control, Null controllability, Air conditioning
Title of the Paper: Theory and
Application of the Composed Fuzzy Measure of L-Measure and Delta-Measures
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Authors: Hsiang-Chuan
Liu, Chin-Chun Chen, Der-Bang Wu, Tian-Wei Sheu
Abstract: The well known fuzzy measures, λ-measure and P-measure, have only
one formulaic solution. Two multivalent fuzzy measures with infinitely many
solutions were proposed by our previous works, called L-measure and δ-measure,
but the former do not include the additive measure as the latter and the
latter has not so many measure solutions as the former. Due to the above
drawbacks, in this paper, an improved fuzzy measure composed of above both,
denoted Lδ -measure, is proposed. For evaluating the Choquet integral
regression models with our proposed fuzzy measure and other different ones, a
real data experiment by using a 5-fold cross-validation mean square error (MSE)
is conducted. The performances of Choquet integral regression models with
fuzzy measure based Lδ -measure, L-measure, δ-measure, λ-measure, and
P-measure, respectively, a ridge regression model, and a multiple linear
regression model are compared. Experimental result shows that the Choquet
integral regression models with respect to extensional L-measure based on
γ-support outperforms others forecasting models.
Keywords: Lambda-measure,
P-measure, Delta-measure, Gamma-support, composed fuzzy measure, Choquet
integral regression model
Title of the Paper: Actual Situation
and Perspectives on Wind Energy Usage in Banat Region
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Authors: I. Szeidert, O.
Prostean, N. Budisan, I. Filip, V. E. Balas, G. Prostean
Abstract: This paper presents synthetically some of the actual trends in the
unconventional energy resources in case of non-polluting wind energy. There
are presented the worldwide efforts engaged on the increase of the wind energy
usage and particularly in the Banat Region, Romania. There is presented the
experience of the researchers from Banat Area and their most important
achievements. There is highlighted the importance of the induction generator
in the wind energy conversion systems and there are stated conclusions based
on practical implementations regarding the optimization of the operation of
induction generators through terminal voltage control. There are identified
the potential participants and the existing legal regulations regarding the
wind energy utilization program and the potential investors. There are stated
objective conclusions regarding the problematic of the wind energy usage in
Romania.
Keywords: Wind energy
usage, wind energy conversion systems (WECS), induction generator, synchronous
generator, wind aggregates, legal regulations, wind programs
Title of the Paper: Intelligent
Steganalytic System: Application on Natural Language Environment
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Authors: Roshidi Din,
Azman Samsudin
Abstract: This paper presents a consolidated view of the computational
intelligence used in the natural language steganalysis. In order to understand
the human intelligence on natural language, four major computational
intelligence methods have been identified. They are bayesian, fuzzy logic,
neural network, and genetic algorithm. This paper also presents a measurement
tool to measure the natural language intelligent system properties based on
steganalysis objectives. It can be learned that the more suitable intelligent
systems to be applied in steganalysis domain properties are: neural network,
genetic algorithm and fuzzy logic.
Keywords: Computational
Intelligence, Steganalysis, Intelligent Steganalytic System, Natural Language
Steganalysis
Title of the Paper: Modeling, Analysis
and Motion Control of a Pan Tilt Platform based on Linear and Nonlinear
Systems
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Authors: Imran S. Sarwar,
Javaid Iqbal, Afzaal M. Malik
Abstract: This paper deals with the modeling, analysis and controlled motion
control of a two degree of freedom pan tilt platform (PTP) for positioning or
aiming a device. The PTP has two revolute joints. The PTP is a device that
makes it possible for the camera to point in a desired direction when mounted
under a carrier such as an aircraft. The objective of this research work is to
derive a linear and nonlinear control system of the PTP to point in a desired
direction within allowable specifications. To perform the analysis and
simulation, all the parameters involved in the system dynamics were
identified. To achieve the motion control a feedback control system with PD
controllers was simulated and tested for the position control of pan and tilt
mechanism. These PD controllers were derived from linear system model were
used in nonlinear control system simulation and tested with real system. The
nonlinear control system developed in this paper is nearest to the physical
system. The motion controller results matched closely with the simulation
results.
Keywords: Linear model,
Nonlinear model, Analysis, Motion control, Security system
Title of the Paper: Controlled Jump
Markov Processes with Local Transitions and their Fluid Approximation
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Authors: Alexey
Piunovskiy
Abstract: Stochastic jump processes, especially birth-and-death processes, are
widely used in the queuing theory, computer networks and information
transmission. The state of such process describes the instant length of the
queues (numbers of packets at different edges to be transmitted through the
net). If the birth and death rates are big, trajectories of such processes are
close to the trajectories of deterministic dynamic systems. Therefore, if we
consider the related optimal control problems, we expect that the optimal
control strategy in the deterministic (‘fluid’) model will be nearly optimal
in the underlying stochastic model. In the current paper, a new technique for
calculating the accuracy of this approximation is described. In a nutshell,
instead of the study of trajectories, we investigate the corresponding dynamic
programming equations. It should be emphasized that we deal also with
multiple-dimensional lattices, so that the results are applicable to complex
communicating systems of queues. Other areas of application are population
dynamics, mathematical epidemiology, and inventory systems.
Keywords: Birth-and-death
process, Continuous time Markov chain, Fluid model, Optimal control, Queuing
system, Dynamic programming, μC-rule, Inventory
Title of the Paper: A Method and an
Algorithm for Obtaining the Stable Oscillatory Regimes Parameters of the
Nonlinear Systems, with Two Time Constants and Relay with Delay and Hysteresis
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Authors: Nutu Vasile,
Moldoveanu Cristian-Emil, Somoiag Pamfil
Abstract: The object of this paper is the oscillatory stable regime of a
particular nonlinear system. This particular nonlinear system includes a
relay, and its linear part is characterized by a transfer function with two
time constants. In the beginning, the paper shows a method that can be used in
the calculus of the parameters for the limit stable cycle, which is
appropriated for these nonlinear systems. After that, the method is
particularized for two different commutation lows of the relay nonlinearity:
relay with hysteresis and relay with delay time. The different commutation
laws induced, for the same linear parts, different shapes and parameters for
the oscillatory stable regimes proper to assembly nonlinear system. These
differences are presented in a case study.
Keywords: Nonlinear
systems, oscillatory regime, relay, delay time, hysteresis, calculus method,
algorithm
Issue 9, Volume 4,
September 2009
Title of the Paper: Lattices for
3-Dimensional Fuzzy Data Generated by Fuzzy Galois Connections
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Authors: Narcis Clara
Abstract: Vagueness and high dimensional space data are usual features of
current data. The paper is an approach to identify conceptual structures among
fuzzy three dimensional data sets in order to get conceptual hierarchy. We
propose a fuzzy extension of the Galois connections that allows to demonstrate
an isomorphism theorem between fuzzy sets closures which is the basis for
generating lattices ordered-sets.
Keywords: Fuzzy Ternary
Relations, Fuzzy Galois Connections, Fuzzy Closure Operators, Isomorphism
Theorem, Lattice
Title of the Paper: Intelligent
Supervision of Petroleum Processes based on Multi-Agent Systems
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Authors: Miguel Angel
Ramirez Canelon, Jacinto Davila, Eliezer Colina Morles
Abstract: This work presents a methodology for the design of an intelligent
supervisory system that combines the principles of fuzzy logic, the Internal
Model Control (IMC) architecture and the paradigm of Multi-Agent Systems
(MAS). The methodology has been conceived to be applied in an intelligent
supervisory system, specifically for two kinds of complex petroleum industrial
processes: the gas-oil separation process and the oilheating process. The
supervision proposal takes into account the fact of using standard local
supervisors schemes connected between themselves and to a global supervisor so
that local objectives in each process can be met, thereby letting the global
or social objective be obtained through the application of basic mechanism of
communication, cooperation and coordination; where these objectives have been
previously defined and structured in a hierarchical manner. The paper includes
some computational simulations performed under MATLAB / SIMULINK and the
results obtained show a good overall system performance.
Keywords: Multi-Agent
System, event detectors, intelligent supervisor system, internal model control
Title of the Paper: A Neo-Fuzzy
Approach for Bottom Parameters Estimation in Oil Wells
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Authors: Edgar Camargo,
Jose Aguilar, Addison Rios, Francklin Rivas, Joseph Aguilar-Martin
Abstract: In this work, an approach for the bottom parameters estimation in
oil wells is presented. It is based on neural networks and fuzzy logic,
specifically on the neo-fuzzy-neuron model. We propose a neo-fuzzy system
compose by two neo-fuzzy neurons. For validating the results, the estimation
is applied in oil wells based on the artificial gas lift method, using
variables of the head of the wells, particularly the gas and production
pressures.
Keywords: Neuro-fuzzy
models, oil system production, artificial gas lift wells, parameters
estimation, neo-fuzzy neurons, oil wells
Title of the Paper: Methods for
Parameters Identification of a HVAC Installation
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Authors: Virginia Finca,
Radu Zglimbea, Emilian Greaban, Constantin Marin
Abstract: This paper presents a procedure for time variant system
identification based on some experimental studies. Some of the system
parameters change in time according to unknown laws. These laws are expressed
as finite degree time polynomials whose parameters are included in the set of
parameters to be identified. Mainly it is an extension of the procedure
developed in [1]. The theoretical methods are now applied on some concrete
platform. Our paper presents the concretization of some experimental
identification methods on experimental workbench from Quanser. HVAC
installation is a test installation for controlling temperature in a chamber,
and for parameters identification
Keywords: Continuous time
systems, Identification, Nonlinear systems, HVAC, Quanser
Title of the Paper: Stabilization of
Linear Time-varying Uncertain Delay Systems with Double Triangular
Configuration
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Authors: Tomoaki
Hashimoto, Takashi Amemiya
Abstract: This paper investigates the feedback stabilization problem of linear
time-varying uncertain delay systems using linear memoryless state feedback
control. Each uncertain parameter and each delay under consideration may take
arbitrarily large values. In such a situation, the locations of uncertain
entries in the system matrices play an important role. It has been shown that
if a system has a particular configuration called a triangular configuration,
then the system is stabilizable irrespectively of the given bounds of
uncertain variations. In this paper, so far obtained stabilizability
conditions are developed into the ones called a double triangular
configuration. The objective of this paper is to show that if a system has
such an extended configuration, then the system is also stabilizable
independently of both the bounds of uncertain parameters and time delays. An
illustrative example is presented to verify the effectiveness of the obtained
result.
Keywords: Stabilization,
Linear systems, Time delay, Uncertain systems, N-matrix
Title of the Paper: Design of Control
Systems Based on Vector Error
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Authors: Oleg N.
Agamalov
Abstract: A new approach to the design of control systems is offered. This
approach based on definition the vector error allowing combining in real time
a stage of identification of unknown plant and calculation of control. The
measurement method of a vector error with use of Hilbert transform also it is
shown.
Keywords: Vector error,
identification, nonlinear system, Hilbert transform, stability
Issue 10, Volume 4,
October 2009
Title of the Paper: An Alternative
Collection of Structural Invariants for Matrix Pencils under Strict
Equivalence
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Authors: A. Diaz, M. I.
Garcia-Planas
Abstract: We consider pairs of matrices (E;A), representing singular linear
time invariant systems in the form Ex_ (t) = Ax with E;A 2 Mp£n(C) under
restricted equivalence. In this paper we obtain an alternative collection of
invariants that they permit us to deduce the Kronecker canonical reduced form.
As application we obtain a reduced form form systems under proportional and
derivative feedback as well proportional and derivative output injection.
Keywords: Singular linear
systems, canonical reduced form, structural invariants
Title of the Paper: Some Observations
on Development and Testing of a Simple Autotuning Algorithm for PID
Controllers
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Authors: Bohumil Sulc,
Stanislav Vrana
Abstract: Although a wide range of control algorithms are available, PID
controllers are still the most widely used type. Even control engineers who
have a good knowledge of advanced control algorithms prefer PID controllers
when they are asked to design the control circuit for a new device. This is
because of their price and because of the simplicity and reliability of the
control algorithm. The PID control algorithm enables anyone with a basic
knowledge of mathematics to gain some idea of what happens inside the
controller during the control process, how the manipulated value is computed
and its dependence on the control error. The main disadvantage of standard PID
type controllers is the absence of autotuning features. Implementation of such
controllers requires time-consuming tuning, and very often the presence of
expensive experts. Therefore, there is quite strong pressure to equip new PID
controllers with simple autotuners. Recently, tuners based on relay
experiments have become popular. However, the use of autotuners of this kind
requires the control process to be stopped temporarily during the relay
experiment. For these reasons, even controllers equipped with these autotuning
facilities are used without any tuning, sometimes even with the factory
presetting. This unsatisfactory situation has motivated us to develop a new
frequency response based autotuning algorithm that does not use any model of
the controlled plant and enables the controller parameters to be changed
without the necessity to break the control process.
Keywords: PID controller,
laboratory model, tuning, model-free, implementation, optimality, mathematical
model, autotuning
Title of the Paper: Vertical Transport
Installations Balance Survey
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Authors: Florin Dumitru
Popescu, Ilie Mitran
Abstract: The operation of vertical transport installations are based on cable
systems with electrical adjustable operation, which ensures the technical
conditions regarding time variation in speed, the current in the main
actuation engines and the acceleration during start-up and breaking. The
actuation electrical systems are part of the category of the fast process of
the automation equipment. For the vertical transport installation the size
which has to be controlled from a command is the speed, the dependent factor
being the tahogram. Adjusting determines the dependence of the sizes in the
process, through a default law, both in relation to the independent sizes and
in relation to the dependent ones from the process, assuring the reduction of
the influence of harmful sizes to the process. The stability of an automatic
system can be defined in different ways. We will consider stability of an
automatic system, that feature which is that when it is subjected to the
action of one harmful size of the moment the system will return in the end at
the stationary phase. Thus, the Balance Survey also deals with the
determination of variation functions in time of the current of the main
actuation motor, of speed (main electrical actuation motor rpm) when starting
the vertical transport installation, as well as the study in time of the
variation of speed when applying loading shock.
Keywords: Nyquist
stability criterion, place of transfer, transfer function, speed adjustment
Title of the Paper: Simulation of the
Heat Exchangers Dynamics in MATLAB & Simulink
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Authors: Pavel Nevriva,
Stepan Ozana, Ladislav Vilimec
Abstract: Heat exchangers that transfer energy from flue gas to steam are
important units of thermal power stations. Their inertias are often decisive
for the design of the steam temperature control system. In this paper, the
analysis and the simulation of the dynamics of the steam superheater are
discussed. Superheater is simulated as a unit of a control loop that generates
steam of desired state values. To simulate the steam superheater on the
computer, the exchanger is described by the set of partial differential
equations. The equations are then solved numerically by modified finite
difference method. Discussion of method and qualitative and quantitative
results are presented. Paper describes use of Simulink S-functions which make
it possible to set-up the most complex systems with complicated dynamics.
There’s a comparison of M and C S-functions, which are two main approaches
when building user-defined blocks in Simulink, regarding both the performance
and the efficiency of the simulation for M and C versions of the codes and the
possibility to perform a real-time simulation.
Keywords: Simulation, Heat
exchangers, Superheaters, Partial differential equations, Finite difference
method, MATLAB&Simulink, S-functions, Real-time
Issue 11, Volume 4,
November 2009
Title of the Paper: DSP based Simulator
for Excitation Control of Synchronous Generator
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Authors: Damir Sumina,
Igor Erceg, Gorislav Erceg
Abstract: This paper proposes a DSP based simulator for the implementing and
testing control algorithms. The simulator is used to control a synchronous
power plant model in real time. The simulator consists of a PC, on which the
synchronous generator connected to AC network is simulated, connected through
a communication channel to a DSP into which the control algorithm has been
implemented. The simulator enables verification of the control algorithm on a
simulation model in real time. In real time the simulator enables faster
processes of engineering, implementing and verifying control algorithms not
only for the voltage control system of a synchronous generator, but also for
other systems able of having mathematical and simulation models. This paper
shows a comparison in the case when both the system model and the control
structure are simulated and for a case when the model is simulated on a
computer and the control structure implemented in the DSP. The implementation
of a conventional and a nonlinear synchronous generator voltage control
structure has been presented. These methods were tested in the cases of
voltage reference change, mechanical power change and the case of a short
circuit on the transmission line.
Keywords: Real time
simulation, DSP based simulator, synchronous generator, excitation control,
nonlinear control
Title of the Paper: A Theoretical and
Empirical Analysis of Convergence Related Particle Swarm Optimization
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Authors: Milan R. Rapaic,
Zeljko Kanovic, Zoran D. Jelicic
Abstract: In this paper an extensive theoretical and empirical analysis of
recently introduced Particle Swarm Optimization algorithm with Convergence
Related parameters (CR-PSO) is presented. The convergence of the classical PSO
algorithm is addressed in detail. The conditions that should be imposed on
parameters of the algorithm in order for it to converge in mean-square have
been derived. The practical implications of these conditions have been
discussed. Based on these implications a novel, recently proposed
parameterization scheme for the PSO has been introduced. The novel optimizer
is tested on an extended set of benchmarks and the results are compared to the
PSO with time-varying acceleration coefficients (TVAC-PSO) and the standard
genetic algorithm (GA).
Keywords: Global
Optimization, Swarm Intelligence, Evolutionary Computation, Particle Swarm
Optimization (PSO), Algorithm Analysis
Title of the Paper: Analysis of Quality
Parameters Influence to Translation of IPTV Service
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Authors: Rasa Bruzgiene,
Lina Narbutaite, Tomas Adomkus
Abstract: The most important for everyone of people to have good time and
relax during TV translations in the work day evening. Nowadays interactive TV,
as IPTV (Internet Protocol Television - digital television, transmiting over
IP networks) is very popular in each country. TV signals for end-users are
transmitted by broadcast Internet network, using Internet protocol (IP). The
most important for end-user is receiving qualitative IPTV service with no any
interference during TV translation. One of the most impact for qualitative
IPTV service is effective and optimal assignment of data streams. It depends
on processing time of data streams in nodes of network. Operative assignment
of data streams is a critical problem for qualitative broadcasting of IPTV
service. In this paper we analyse the assignment of data streams in core and
access networks, influence of intensity and delay for assignment of data
streams in different nodes of real and simulated IPTV networks. The main
results showed that the efficiency of real IPTV network is less than
efficiency of simulated IPTV network.
Keywords: IPTV, MOS, Data
streams, Video streams, Delay, IPTV Headend, Access network, End – user,
Quality of IPTV, STB
Title of the Paper: New Management for
the Control Three Tank System
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Authors: Marius-Constantin
Popescu, Gheorghe Manolea, Liliana Perescu-Popescu, Nikos Mastorakis
Abstract: The development of fuzzy regulators designed for conduction of
neminimum faze sistems need a great volum of work conected to: defining the
basic rules, chosing the values of free parameters of fuzzy regulators and
checking the stability of the automated guiding sistems with fuzzy regulators.
The objectives of this paper consists in the application of FuzzyLib library
regulators to develop quasi-fuzzy PI Mamdani-type equipment for laboratory
management system with three tanks and the modification of software and
interface to enhance the existing flexibility in the sense of providing the
facility to develop more regulators.
Keywords: Nonlinear
mathematical model, Fuzzy regulators
Issue 12, Volume 4,
December 2009
Title of the Paper: Componentwise
Stability of the Singular Discrete Time System using the Methodology of the
Drazin Inverse
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Authors: Habiba Mejhed,
Nour El Houda Mejhed, Abdlaziz Hmamed
Abstract: The asymptotic (exponential) stability in the sense of componentwise
approach is considered for one and two dimensional linear discrete-time
singular systems. The two dimensional system is described by
Fornasini-Marchesini model. The main motivation for these results is the need,
particularly felt in the evaluation in a more detailed manner of the dynamical
behaviour of linear discrete-time singular systems. Combining the basic theory
of Drazin inverse and the results reported in the case of the discrete time
linear systems (see Hmamed, 1997), both necessary and sufficient conditions
are established ensuring the componentwise asymptotic (exponential) stability.
In addition, numerical examples are proposed to illustrate the correctness of
the obtained results.
Keywords: Componentwise
stability; Singular system; discrete time systems; 2D Fornasini-Marchesini
model; Drazin inverse theory
Title of the Paper: Dynamic Behavior of
Closed Grinding Systems and Effective PID Parameterization
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Authors: Dimitris
Tsamatsoulis
Abstract: The object of the present study is to investigate the dynamic of
closed circuit cement mills and based on that to tune robust PID controllers
applied to three actual installations. The model that has been developed,
consisting of integral part, time delay and a first order filter, is based
exclusively on industrial data sets collected in a period more than one year.
The model parameters uncertainty is also assessed varying from 28% to 36% as
the gain is concerning and 34% to 42% as regards the time delay. As
significant sources of model uncertainty are determined the grinding of
various cement types in the same cement mill and the decrease of the ball
charge during the time. The Internal Model Control (IMC) and M - Constrained
Integral Gain Optimization (MIGO) methods are utilized to adjust the
controller parameters. Specially by implementing the MIGO technique robust
controllers are built deriving a daily average IAE 2.3-3% of the set point
value. Due to the high flexibility and effectiveness of MIGO, the controllers
can be parameterized by taking into account the cement type ground and the
power absorbed. Subsequently the attenuation of main uncertainties leads to
improvement of the regulation performance.
Keywords: Dynamic, Cement,
Mill, Grinding, Model, Uncertainty, PID, tuning, robustness, sensitivity
Title of the Paper: An Adaptive
Quantum-based Evolutionary Algorithm for Multiobjective Optimization
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Authors: Jerzy Balicki
Abstract: An Adaptive Quantum-based Multi-criterion Evolutionary Algorithm
called AQMEA is a new paradigm of decision making for complex systems.
Quantum-based algorithms utilize a new representation for the smallest unit of
information, called a Q-bit, for the probabilistic representation that is
based on the concept of qubits. Evolutionary computing with Q-bit chromosomes
has a better characteristic of population diversity than other
representations, since it can represent linear superposition of states
probabilistically. Moreover, we consider the three-criterion problem of task
assignment.
Keywords: Quantum
algorithms, multi-criterion optimization, distributed systems
Title of the Paper: Robust Motion
Control of Biped Walking Robots
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Authors: Ashraf A. Zaher,
Mohammed A. Zohdy
Abstract: This paper proposes a robust mathematical approach for motion
control. The proposed control tech-nique is applied to a three-degree of
freedom Biped walking robot for illustration. The design technique is di-vided
into two major steps; the first one is to establish a robust position control
scheme with both guaranteed stability and trajectory tracking capability using
a model-reference technique that assumes only the knowledge of the upper bound
of the model uncertainty. The performance of this step is investigated for the
two cases of point-to-point and trajectory-following motions. The second step
is to design an intelligent path planner for the walking Biped that takes all
motion constraints into account. Animation is used to check for both motion
har-mony and trajectory following. The real-time applicability of the proposed
controller is investigated and tra-deoffs between stability and performance
are carefully studied. In addition, real-time potential of the controller is
being studied for further application.
Keywords: Model-Reference
Control, Robotics, GAIT Analysis, and Modeling and Simulation
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