|
|
|
Issue 1, Volume 3,
January 2008
Title of the Paper: Genetic Algorithm Optimization of Fuel Consumption in Compressor
Stations
DOWNLOAD FULL PDF
Authors: B. Fahimnia, R. Molaei, M. Ebrahimi
Abstract: Natural gas passing through pipelines is transported via compressor stations. These stations are
usually installed at above 60 miles away from intervals in order to overwhelm the pressure loss generated
through the friction or the heat exchanging. Different compressors have been utilized in these stations to
acquire the constraint gradient pressure and maintain the required mass flow rate at the delivery. A
considerable proportion of the transported gas is however consumed to supply the drift force. Since currently
millions of MMSCFD gases are transferred between countries, it seems indispensable to propose a precise
model to minimize the consumed fuel and to stumble on suitable decision-making variables.
This paper analyzes non-linear mathematical relationships which are required to evaluate the steady,
isothermal, one-dimensional and compressible flow inside the pipes. In the next stage, the study establishes the
equations associated to the compressor performance and it finally evaluates the rate of fuel consumption in the
power generator. The activities are divided into two categories: a) simulation by means of the computational
modules, related to the fluid specifications and the main components of the transmission system, b)
amelioration through the exploitation of the optimization methodology using genetic algorithms. Spread sheets
are utilized as useful tools to establish a relationship among the aforementioned sections and the analysis of
the system comportment. The optimization modeling aims to improve the fuel consumption in the compressor
stations available in the network commensurate with the stipulations of the transmission system.
Keywords:
Optimization, Genetic Algorithm, Compressor Station, Fuel Consumption, Spread Sheets
Title of the Paper: The
Study
of
Novel
Detection
Approach
for
OCS
Dynamic
Parameters
of
High-speed
Electrified
Railway
DOWNLOAD FULL PDF
Authors: Chen Tanglong, Ma Fengchao, Zhou Yan
Abstract: This paper starts with dynamic response of pantograph slider, and computes the dynamic
parameters of pantograph-catenary system such as contact force, hard spot, pull-off value and contact wire
height by utilizing the transfer function matrix gained beforehand and the displacements of pantograph slider
measured with the laser range sensors configured at the low voltage side. The paper also deducts the numerical
algorithm of response matrix and transfer function matrix, demonstrates the feasibility of reducing the number
of laser range sensors, and verifies its effectiveness by simulation with a simple example. Keywords:
OCS (Overhead Contact System); Pantograph; System Response; Contact Force; Pull-off Value;
Hard Spot; Contact Wire Height; Laser Testing Displacement
Title of the Paper: Original Method for Stability Analysis of Mechatronic
Systems with Asynchronous Machines
DOWNLOAD FULL PDF
Authors: Sorin Enache, Aurel Campeanu,
Ion Vlad, Monica Adela Enache
Abstract: This paper details an original method for the stability analysis of mechatronic systems driven by
asynchronous machines. The mathematical basis of the method and a few characteristics obtained with an
adequate Matlab program are presented. The windows of the program for monitoring of the experimental tests
are also depicted. Finally a series of experimental tests and the conclusions confirming the validity of the
proposed method are presented.
Keywords: stability, mechatronic system, asynchronous machine, variable frequency, parameters, software.
Title of the Paper: Evaluation of Hand Grasping by Instrumented Glove
DOWNLOAD FULL PDF
Authors: Tamara Supuk, Tadej Bajd, Vlasta Zanchi
Abstract: In this paper the evaluation of effectivenes of instrumented glove in measurement of hand opening and
preshaping during reach-to-grasp movement is described. In the experiment presented in this work the reach-to-grasp
movement of one healthy subject was measured by two different types of motion-tracking devices (3D optical system,
Optotrak, and commercial instrumented glove, 14 sensors Ultra Data Glove) with the aim to answer if the rather simple
glove-system can substitute complex and expensive optical system in assessment of hand preshaping during reach-tograsp.
Keywords: hand kinematics, reach-to-grasp movements, hand preshaping, hand model, instrumented glove,
rehabilitation
Title of the Paper: Resonance at motion of a body in the Mars's atmosphere under biharmonical moment
DOWNLOAD FULL PDF
Authors: Vladimir S. Aslanov
Abstract: An uncontrolled motion of a reentry vehicles in the rarefied Mars's atmosphere is investigated. Such reentry vehicle has small lengthening and a blunted form for effective braking [1]. This type of Lander can have three balancing positions of a spatial angle of attack: α = 0, α* != 0, α* = π depending on the position of the center mass. The change of a dynamic pressure the descent into the atmosphere can lead to resonance. It is shown, that the numerical integration of motion equations does not give reliable results due to the probabilistic character of transients with related to resonance. The conditions of movement stability are received identified for various areas of movement under resonance. The suggestion is to calculate the top and bottom parameters of movement using averaged equations. The research shows that the resonance could cause the accident the Beagle 2 Lander.
Keywords:
Uncontrolled Reentry Vehicle, Resonance, Stability, Separatrice, Atmosphere, Mars
Title of the Paper: Experimental Design and Models of Power System
Optimization and Control
DOWNLOAD FULL PDF
Authors: R.C. Berredo, L.N. Canha, P.Ya. Ekel,
L.C.A. Ferreira and M.V.C. Maciel
Abstract: This paper reflects results of research into the use of factorial experimental design for rational
constructing sensitivity models as well as functionally oriented models for system optimization and control.
The questions of overcoming difficulties of statistical evaluating the results of experiments with models of
systems, but not real systems are discussed. The results of the paper are of a universal character and are
illustrated by applications to power engineering problems: coordinated voltage and reactive power control in
power systems in regulated and deregulated environments, based on fuzzy logic technology with applying
diverse types of sensitivity indices, and monocriteria and multicriteria optimization of network configuration in
distribution systems with constructing functionally oriented models to evaluate power system reaction.
Keywords:
Sensitivity Models, Functionally Oriented Models, Factorial Experimental Design, Fuzzy Logic
Based Voltage and Reactive Power Control, Distribution Network Reconfigutration.
Title of the Paper: Synthesis Of Attitude Motion Of Variable Mass Coaxial Bodies
DOWNLOAD FULL PDF
Authors: Anton V. Doroshin
Abstract: This work involves the research of a motion of a mechanical system consisting from coaxial bodies of variable mass in a translating coordinate system. The author gives a theorem on the change in the angular momentum of a system of variable mass coaxial bodies with respect to translating axes. The dynamic equations of motion are constructed using the example of two coaxial bodies. The modification of mass parameters of coaxial bodies (mass, moments of inertia) causes nontrivial changes of system angular motion. The article describes a special developed method for qualitative phase space analysis, based on the evaluation of a phase trajectory curvature. The method suggested makes it possible to determine the phase trajectory shape and to synthesize conditions for special motion modes realization (for example, nutation angle monotonous diminution or magnification). The results obtained can be used to describe the motion of a coaxial dual-spin spacecraft, performing active maneuvers with a change in mass.
Keywords:
Coaxial Bodies, Unbalanced Gyrostat, Dual-Spin Spacecraft, Variable Mass, Active Maneuvers, Attitude Motion, Qualitative Method, Phase Trajectory Curvature
Title of the Paper: One Type of Controller Design
for Delayed Double Integrator System
DOWNLOAD FULL PDF
Authors: Katarina Zakova
Abstract: The aim of this paper is to present a constrained pole assignment controller that is based on the
analysis of optimal settings for the double integrator system. It takes into account parasitic delays in the control
structure and constraints imposed on the control signal. In addition, one can find here approximation procedure
resulting to the models that were used at the controller design. The whole design is illustrated on two examples.
Keywords:
Pole assignment control, constraints, saturation, double integrator model, delays, approximation.
Issue 2, Volume 3,
February 2008
Title of the Paper: Novel Approach for Detection and Tracking of Explosive Carrying Mobile
Humans with Odor-Sensor Based Multisensor Networks
DOWNLOAD FULL PDF
Authors: Ahmet Kuzu, Metin Gokasan, Seta Bogosyan
Abstract: In this study, a distributed system which could be used to detect and track an explosive carrying mobile
human is designed. As a novel approach to existing odor detection and tracking methods, a technique which combines
odor and sound detection is proposed for increased accuracy. To this aim, a MEMS sensor network including a
pressure sensor, an accelerometer, a microphone, an odor sensor and electronic unit is proposed. For the electronic unit
of this system a sensor network and least square estimation based sensor fusion algorithm is developed and simulated.
The results are evaluated with respect to various paths of two humans, one carrying the explosive. The results show
that odor sensing alone is not sufficient for the accurate determination of the odor track, and that by adding other
conventional tracking methods, accuracy could be increased.
Keywords: Odor, Tracking, Sensor networks, Sensor fusion, Least squares, Explosive
Title of the Paper: A Solution to the Continuous and Discrete-Time Linear Quadratic Optimal Problems
DOWNLOAD FULL PDF
Authors: Corneliu Botan, Florin Ostafi
Abstract: The paper establishes a non-variational procedure in order to obtain the solution to an optimal control problem. The optimal control refers to a quadratic criterion with finite final time, regarding a time-variant linear system, for continuous and discrete time cases. The proposed solution is more convenient for implementation by comparison with the classical ones. The indicated optimal controller is advantageous especially in the time-invariant case. New solutions to Riccati differential / difference equations are also presented. Keywords:
optimal control, linear quadratic, finite final time, continuous and discrete time, Riccati equation
Title of the Paper: Specification of a Multiagent System for Planning and Management of the Production Factors for Automation based on the SCDIA Framework and MASINA Methodology
DOWNLOAD FULL PDF
Authors: Jose Aguilar, Mariela Cerrada, Francisco Hidrobo,
Jorge Chacal, César Bravo
Abstract: In this work, we propose a general reference model for planning and production factors management. Then, such a model is applied for proposing a system for the ERP problem for the automation applications. This multiagent system is specified in the framework of the SCDIA reference model by using the MASINA Methodology. Keywords:
Industrial Automation, Enterprise Resource Planning (ERP), Multiagent Systems (MAS)
Title of the Paper: Optimal Adaptive Fuzzy Control for a Class of Unknown Nonlinear
Systems
DOWNLOAD FULL PDF
Authors: I. Lagrat, A. El Ougli , I Boumhidi
Abstract: In this paper, we present an optimal adaptive fuzzy controller for a class of nonlinear systems with
unknown nonlinear dynamics. The strategy of control is based on the fuzzy systems and linear matrix
inequalities (LMI). The adaptive fuzzy logic system is used to approximate the unknown dynamics; we exploit
the linear structure of a Takagi-Sugeno fuzzy system with constant conclusion to design an indirect adaptive
fuzzy controller. The auxiliary compensation control is added to attenuate the influence of external disturbances
and to remove fuzzy approximation error. The design of the auxiliary control relies on LMI and the Lyapunov
technique for achieving stability and specified performance. The adaptation laws of the adjustable parameters
are deduced from the stability analysis, in the sense of Lyapunov, to get a more accurate approximation level.
Simulation results are given to illustrate the tracking performance. Keywords:
Nonlinear systems, Adaptive control, Fuzzy systems, Takagi-Sugeno Fuzzy Model, LMI,
Lyapunov Approach.
Title of the Paper: Speed-Sensorless Nonlinear Predictive Control of a Squirrel Cage Motor
DOWNLOAD FULL PDF
Authors: I. I. Siller-Alcala, M. Abderrahim, J. Jaimes-Ponce,
and R. Alcantara-Ramirez.
Abstract: This paper presents a nonlinear generalised predictive control scheme for a squirrel cage motor without speed sensor. Some of the difficulties faced are due to uncertainties in the parameters measurements, high cost to obtain state measurements in addition to the inherently non-linear behaviour. The control scheme presented is composed of a positioning predictive control and an open loop observer used to obtain state measurements. The proposed control scheme allows a simple and straightforward implementation. The effectiveness of this control algorithm has been successfully verified through simulations. Keywords:
Nonlinear System, Predictive Control, Induction Motor, Speed-sensorless control, Open loop observer.
Title of the Paper: The Simulation Hybrid Fuzzy Control of Scara Robot
DOWNLOAD FULL PDF
Authors: Marius-Constantin Popescu, Ilie Borcoşi
Onisifor Olaru, Luminiţa Popescu, Florin Grofu
Abstract: This paper presents the simulation of a Hybrid Fuzzy Controller suitable for industrial
applications. The developed Hybrid Fuzzy Controller consists of a weighted combination of the Direct Fuzzy
Controller and Indirect Fuzzy Controller and a gradually activated supervisory controller. The unique feature
of the Hybrid Fuzzy Controller is that no mathematical models of the plant are required and the proposed
controller is able to adequately estimate the bound functions on-line, which are required for the determination
of the supervisory controller. The supervisor controller in the sense that all signals are bounded guarantees
global stability of the closed-loop system. The approach of rapid prototyping is utilized to implement the
Hybrid Fuzzy Controller so as to control a Selectively Compliance Assembly Robot Arm. Simulink, an
interactive graphical software for simulating dynamic systems, is used to model, simulate and analyse the
dynamic system. Keywords:
SCARA Robot, Simulink, Hybrid Fuzzy Controller
Title of the Paper: Conventional Control and Fuzzy Control Algorithms for Shape
Memory Alloy based Tendons Robotic Structure
DOWNLOAD FULL PDF
Authors: Bizdoaca Nicu-George, Petrisor Anca, Bizdoaca Elvira
Abstract: Shape memory alloy offer an interesting solution, using the shape transformation
of the wire/structure in the moment of applying a thermal type transformation able to offer the
martensitic temperature. This thermal transformation can be inducted using electrical current
and a suitable control strategy. In order to assure an efficient control of robotics SMA
actuator, a mathematical model and numerical simulation of the resulting model is required.
For an efficient study a Simulink block is developed (block for user configurable shape
memory alloy material). Due a particular possibility SMA actuator connection, a modified
dynamics for wire or tendon actuation is presented. The control possibilities are explored: PI,
PD,PID and fuzzy logic controller are connected to the single link SMA actuation.
Experimental results and numerical simulations are presented and observations are formulated. Keywords:
smart materials, shape memory alloy, robotics, conventional control, fuzzy logic, numerical
simulation
Title of the Paper: Model-based Control and Learning Control Method for
Automobile Idle Speed Control using Electric Throttle
DOWNLOAD FULL PDF
Authors: Teruji Sekozawa
Abstract: Recently, it has become important to reduce the fuel consumption of automobile engines in order to
reduce the amount of CO2 emission. Reduced consumption can be achieved by reducing the idle rotation speed.
However, the idling stability at low idle speeds tends to be worse than that at higher idle speeds. Thus, more
accurate idle speed control is required. In the present paper, we propose an engine model-based feed-forward
idle control system. The model-based control system is demonstrated to achieve better control results. In
addition, aging and environmental changes (such as temperature reduction) vary with the torque required for
driving in-vehicle equipments and cause a deterioration of control for maintaining the idle speed. Regarding this
problem, a new learning control method is developed and applied to an actual vehicle to verify that
controllability can be improved. Keywords:
Idle speed control, Engine model, Feed-forward control, Electric throttle system,
Model-based control, Environmental changes, Learning control
Issue 3, Volume 3,
March 2008
Title of the Paper: Performance Evaluation of Static Transfer Switch
DOWNLOAD FULL PDF
Authors: Ramesh Pachar, Harpal Tiwari
Abstract: This paper investigates the performance of GTO switches based STS system for improving the
power quality of a sensitive three-phase RL load. Performance of the proposed system is compared with IEEE
Benchmark System (STS-1). Extensive simulations are carried out to validate the use of GTO switches in
medium voltage systems to achieve a lesser transfer time in network reconfiguration. Performance evaluation of
GTO based STS system is carried out under various faults/disturbance conditions. Simulations are performed
using simulink tool of MATLAB software package. Keywords:
Power Quality, Static Transfer Switch, Preferred Source, Alternate Source, Transfer Time,
Detection Time, Sensitive load, Control Logic.
Title of the Paper: Simulation of n-r Robots
DOWNLOAD FULL PDF
Authors: Popescu Marius-Constantin, Borcoşi Iilie,
Olaru Onisifor, Antonie Nicolae
Abstract: Modelling and simulation of n-DOF robots with revolute joints are presented in the paper. First,
numerical effective equations to solve the direct kinematics of n-degree-of-freedom robots are derived.
Following this, the dynamic model based on Lagrangian equation is developed. In the model the characteristics
of robots are utilized and therefore the complexity of the model is increasing slower with the number of degrees
of freedom compared with the general type of manipulators. Next, some cost functions for n-R robots and their
gradients are presented. The derived models represent the basis of the software package "Robotic Toolbox"
implemented in Matlab. The package allows the user to create and simulate different systems considering
robots. Matlab functions and Simulink blocks provided include forward kinematics, dynamics and several
utility functions. Keywords:
Modelling; Redundant robots; Simulation n-r robots.
Title of the Paper: Fuzzy Clustering Based Models Applied
To Petroleum Processes
DOWNLOAD FULL PDF
Authors: Miguel Angel Ramirez Canelon and Eliezer Colina Morles
Abstract: The application of fuzzy clustering techniques has recently become in a very useful alternative in the
area of modeling and identification of complex industrial processes. In particular, fuzzy clustering techniques
such as Fuzzy C-Means and the Gustafson-Kessel (GK) algorithms will be analyzed and applied in details in
this paper. These algorithms will be implemented in the construction of Takagi-Sugeno fuzzy models for the
gas-liquid separation process, the water-oil separation process and the oil-heating process, which are important
processes in the oil industry. Validations of the obtained fuzzy models will be performed and some conclusions
will be established. Keywords:
Fuzzy clustering, Fuzzy C-Means, Gustafson-Kessel (GK) algorithm, least-squares method,
artificial lift production methods, production separator, washing-tanks and fired heaters.
Title of the Paper: Servo Tracking of Three-Dimensional Motion by the Parallel
Trinocular
DOWNLOAD FULL PDF
Authors: Chi-Cheng Cheng, Lan-Yuan Hsu,
Gwo-Long Lin, And Chien-Hung Chiang
Abstract: This study develops a novel least-squares algorithm for recovering the translational motion
parameters of a moving object using a parallel trinocular vision system. Although the proposed approach
overcomes the matrix singularity problem inherent in binocular observers, its implementation is somewhat
complex. Accordingly, a compact closed-form version of the algorithm is proposed to facilitate real-world
visual imaging applications. The closed-form scheme not only resolves the matrix singularity problem, but
also avoids the requirement for matrix manipulation and is therefore computationally efficient. The validity of
the closed-form scheme is verified by comparing the known translation displacements of a target object with
the estimated values. The results demonstrate that the proposed scheme accurately recovers the translational
motion parameters provided that the movement of the target in the depth direction is of limited magnitude
only. To verify the practical applicability of the proposed scheme, a servo tracking experiment is performed in
which a parallel trinocular system mounted on a servo-driven positioning platform is used to track the motion
of a target object as it is moved through a series of 3D displacements. The experimental results demonstrate
that the closed-form scheme enables the parallel trinocular vision system to track the target effectively.. Keywords:
Machine vision, Optical flow, Signal processing, Tronocular, Visual servo.
Title of the Paper: Real Time Monitoring in Web Telerobotics
DOWNLOAD FULL PDF
Authors: Ionut Resceanu, Marius Niculescu
Abstract: There is a growing need for humans to perform complex remote operations and to extend the intelligence and experience of experts to distant applications. A blending of human intelligence, modern information technology, remote control, and intelligent autonomous systems is required. Telerobotics goes beyond autonomous control in that it blends in human intelligence and action as appropriate. It goes beyond teleoperation in that it incorporates as much autonomy as is possible or reasonable. A new approach for solving one of the fundamental problems facing teleautonomous systems is discussed: the need to overcome time delays due to telemetry and signal propagation. Optimized maintenance can reduce operating costs by demanding less resources and avoiding equipment breakdown, hence ensuring that daily manufacturing and production will not be interrupted. Web-based maintenance is one of the most efficient methods for optimizing maintenance. The Web-based monitoring system discussed provides remote sensing, monitoring, and on-line fault diagnosis for equipment, together with a collaborative maintenance platform for international experts to interactively share their experiences in maintenance. Keywords:
Telerobotics, Web, Internet, Control, TCP/IP, UDP, Real-Time, Monitoring
Title of the Paper: Advances of OPC Client Server Architectures for Maintenance Strategies
-
a Research and Development Area not only for Industries
DOWNLOAD FULL PDF
Authors: Schwarz M.H, Boercsoek J
Abstract: OPC is a matured and accepted standard in industries, but hardly used in industrial applications developed
at universities, especially in Europe. Publications in this area, either using OPC-communication or developing
applications have been hardly increased over the past several years. This paper reports the current state of the
standard, but also describes current problems and how they can be managed and overcome. The authors also give an
overview of the recently published new standard, which is called: OPC unified approach. After the fundamentals are
described in this paper, the authors present their experiences with OPC to combine it with methods and procedures to
develop a modern maintenance system. It also reports current developments at the Department of Computer
Architecture and System Programming at the University of Kassel. Keywords:
OLE for process control, OPC, client-server architecture, condition based maintenance, unified
architecture, OPC unified approach, OPC-UA
Title of the Paper: Manuscript received Nov. 19, 2007; revised Feb. 7, 2008
DOWNLOAD FULL PDF
Authors: K S Sandhu, Dheeraj Joshi
Abstract: This paper presents a new and simple model for the steady-state analysis of single and parallel operated self-excited induction generators (SEIG). In this paper an attempt has been made to incorporate the unjustified assumptions in an existing (Watson's) model. This has resulted into an improved model for the estimation of performance of SEIG. A close agreement of simulated results using proposed modeling with experimental values on test machines proves the validity and superiority of proposed model. Further proposed model is extended for the analysis of a system comprising of number of such machines operating in parallel. Keywords:
Parallel operation, steady state analysis, self-excited induction generator (SEIG), wind energy conversion.
Title of the Paper: Q-Learning Based on Hierarchical Evolutionary Mechanism
DOWNLOAD FULL PDF
Authors: Masaya Yoshikawa, Takeshi Kihira, Hidekazu Terai
Abstract: Reinforcement learning is applied to various fields such as robotics and mechatronics control. The
reinforcement learning is an efficient method to control in unknown environment. This paper discusses a new
reinforcement learning algorithm which is based on Genetic Algorithm and has a hierarchical evolutionary
mechanism. The proposed learning algorithm introduces new adaptive action value tables and it enables sharing
knowledge among agents effectively. Regarding sharing knowledge among agents, the knowledge is inherited not
only across the generations, but also in one generation. As a result, the proposed algorithm achieves effective
learning, and realizes robustness learning. Computational simulations using the pong simulator which executes
table tennis prove the effectiveness of the proposed algorithm. Keywords:
Q-Learning, Genetic Algorithm, Sharing knowledge among agents, Robustness of learning,
Hierarchical evolutionary mechanism
Issue 4, Volume 3, April 2008
Title of the Paper: Simulation of 3D Temperature Fields of Sensors Supported by 2D IR Camera Images of Sensors' Surface Temperatures
DOWNLOAD FULL PDF
Authors: Pavel Nevriva , Zdenek Machacek, Jan Krnavek
Abstract: In this paper, the calculation of temperature fields inside sensors' bodies is discussed. The temperature of a sensor is a function of time and spatial coordinates. Structures of mathematical models describing the temperature fields depend on the environment in which sensors operate. In this paper, temperature fields in sensors are described by the Fourier partial differential equation. Mathematical model of the particular sensor has many parameters which are known with limited accuracy. To upgrade this accuracy, the physical model incorporating both the analyzed sensor and the ambient conditions similar to the real ones is built. Mathematical model is constructed and calculated to solve tasks described by the physical model. Differences between analytical and experimental results are used for an adaptive correction of parameters of the mathematical model. In this paper, differences between models are evaluated from differences between surface temperatures of the sensors. At the physical model, sensor's surface temperature is measured by the infrared camera. At the mathematical model, sensor's temperature is obtained solving the Fourier partial differential equation by the finite element method. It is calculated by the ANSYS Workbench software. Numerical values of sensors' surface temperatures from both models can be displayed as images. To compare the experimental and analytical results, images generated by the IR camera are transformed by a set of image processing functions. Both the general method and the case study results obtained on the complex problem of the analysis of the heat transfer dynamics of the motor oil level gauge are presented. Keywords:
simulation, image processing, finite element methods, sensors.
Title of the Paper: Controls Ways of the Transportation Capacity Variation for the Canvas Conveyer
DOWNLOAD FULL PDF
Authors: Florin Dumitru Popescu
Abstract: Mining transportation is an important element of the economic efficiency rising in mining sector, because the transportation average included in the cost of production for one tone of extracted coal, represents approximately half of it. In order to control the transportation system and to have enough information about the below-ground and the above-ground manufacturing process, it is necessary to keep a close look on the transported output through the canvas conveyer.The permanent measurement of the mining material volume controlled by continuous transporting equipment machines implies knowing its transversal section profile at a given moment and the instantaneous velocity of the transporting belt conveyor. The approximation of the material profile section is done by measuring the level of the transporting material in different points and afterwards by approximating the corresponding curve through methods of numerical interpolation. In this paper two approximation (interpolation) methods are presented: Lagrange and the spline functions method. The present study wants to solve the problem by using some unconventional methods, in order to assure reliability, precision, as well as the possibility of integrating it into the mining monitoring system. The constant measurement of the cross section of the transported material through the canvas conveyer, as well as of the belt speed, leads to the determination of the transported volume, and depending on it, knowing the average density, you can determine the output. Keywords:
Interpolation, Lagrange, Spline, Polynomial, Function, Ultrasound Transducers
Title of the Paper: Multiple Modeling and Fuzzy Predictive Control of
A Tubular Heat Exchanger System
DOWNLOAD FULL PDF
Authors: A. H. Mazinan and N. Sadati
Abstract: In this paper, a novel generalized predictive control (GPC) strategy using multiple models approach has been presented. The proposed strategy is realized based on the Takagi-Sugeno-Kang (TSK) fuzzy-based modeling for control of a tubular heat exchanger system. In this strategy, different operating environments of the system with varying parameters are first identified. Then for each environment, a linear model and its corresponding fuzzy predictive controller are designed. For demonstrating the effectiveness of the proposed approach, simulations are done and the results are compared with those obtained using the single model predictive control approach. The results can verify the validity of the proposed control scheme. Keywords:
Fuzzy generalized predictive control, TSK fuzzy-based modeling, multiple models control approach, tubular heat exchanger system, the best model identification, operating environments.
Title of the Paper: Impact of MOSFET's performance on its threshold voltage and its influence on design of MOS inverters
DOWNLOAD FULL PDF
Authors: Milaim Zabeli, Nebi Caka, Myzafere Limani, Qamil Kabashi
Abstract: The aim of this paper is to research the impact of physical parameters which characterize the MOSFET transistors structure on the threshold voltage values and its influence on critical voltage values which characterize digital circuits that contain the MOSFET transistors. The results obtained emphasize the impact of each single physical parameter on the total value of the threshold voltage. By adjusting the values of MOSFET physical parameters the accepted threshold voltage can be achieved. Since the threshold voltage will have influence on critical voltage values which characterise MOS inverters and delay times during transfer logic states between stages, it must be taken into consideration during design phase of logic gates that contain the MOSFET transistors. Keywords:
Threshold Voltage, MOSFET Parameters, Enhancement-Type NMOS, Impurities, Doped Density, Short-Channel, Narrow-Channel, Voltage Level, Propagation Delay, Critical Values.
Title of the Paper: A Novel and Accelerated Genetic Algorithm
DOWNLOAD FULL PDF
Authors: Huang Bao-Juan, Zhuang Jian, Yu De-Hong
Abstract: Genetic algorithm (GA) is very helpful when the developer does not have precise domain expertise, because GA possesses the ability to explore and learn from their domain. At present, the research of GA mainly focuses on the three operators and devotes to improve the algorithm efficiency and avoid premature convergence. This paper presents a cycle mutation operator and a novel selection operator; accordingly, an improved cycle mutation genetic algorithm (ICMGA) is schemed, The experimental results compared with other genetic algorithms validate the performance of this algorithm, such as the exploration ability in search space, the stabilization and calculation speed, are all superior to other algorithms, and ICMGA is not sensitive to the initial population distribution. Keywords:
Genetic algorithm, Evolution algorithm, mutation operator, selection operator, and cycle mutation operator
Title of the Paper: DSP-Based Two-Synchronized Motors Control System
Using External FPGA Design
DOWNLOAD FULL PDF
Authors: Omar Al-Ayasrah and Ayman Al-Lawama
Abstract: There are many applications that have more than one motor to be controlled dependently to execute
the same task or independently to execute different tasks at the same time with high performance low cost
control system. This paper presents a Two-Synchronized Motors Control System Using External FPGA Design
with high performance and low cost for a variety of applications. The proposed technique is DSP and FPGA
based system. An external FPGA structural design is interfaced with the PWM Generation Unit of the D SP
board for the use of Two-Motor Control using one DSP Processor. The system is implemented using the
Analog Devices Blackfin™ ADSP-BF561 dual core Digital Signal Processor (DSP). Core 1 is dedicated to
implement the motor one control algorithm while core 2 mainly implements the motor two control algorithm
with one PWM Generation Uni t to reduce the overall cost and complexity of the motors control system. The
FPGA design is implemented using VHDL language and downloaded successfully to the XILINX VERTEX-E
FPGA. The FPGA board is then interfaced successfully with the ADSP PWM Unit. Simulation and
experimental results are achieved successfully and introduced in this paper. Keywords:
Blackfin ADSP-BF561, FPGA, Two Motors Control.
Title of the Paper: A Practical Approach for Position Control of a Robotic Manipulator
Using a Radial Basis Function Network and a Simple Vision System
DOWNLOAD FULL PDF
Authors: Bach H. Dinh, Matthew W. Dunnigan, Donald S. Reay
Abstract: This paper proposes a new practical approach using a RBFN (Radial Basis Function Network) to
approximate the inverse kinematics function of a robot manipulator. It can be effectively applied for position
control of a real robot-vision system in which robot movement in the workspace is observed by a camera. In
fact, there are several traditional methods based on the known geometry of the manipulator to determine the
relationship between the joint variable space and the world coordinate space. However, these traditional
methods are impractical if the manipulator geometry cannot be determined easily, a robot-vision system for
example. Therefore, a neural network with its inherent learning ability can be an effective alternative solution
for the inverse kinematics problem. In this paper, an approach using a RBFN with predefined centres in the
hidden layer (distributed regularly in the workspace) and a combination of the strict interpolation method and
the LMS (Least Mean Square) algorithm is presented for effective learning of the inverse kinematic function.
By using the strict interpolation method and constrained training data an appropriate approximation of the
inverse kinematic function can be produced. However, this solution has the difficulty of how to collect the
constrained training patterns whose inputs are selected at pre-defined positions in the workspace. Additionally,
the LMS algorithm can incrementally update the linear output-layer weights through an on-line training
process. Thus, the proposed idea of combining these techniques can produce the advantages of both methods to
deal with the difficulties in practical applications, such as the sensitive structure of a real robot-vision system or
a realistic situation where the initial setup and application environments are different. To verify the
performance of the proposed approach, practical experiments have been performed using a Mitsubishi PA10-
6CE manipulator observed by a webcam. All application programmes, such as robot servo control, neural
network, and image processing were written in C/C++ and run in a real-time robotic system. The experimental
results prove that the proposed approach is effective. Keywords:
RBFN, robot-vision, strict interpolation, inverse kinematics, PA10-6CE manipulator.
Title of the Paper: A Robust Forced Dynamic Sliding Mode Minimum Energy Position Controller for Permanent Magnet Synchronous Motor Drives
DOWNLOAD FULL PDF
Authors: Stephen J. Dodds, Gunaratnam. Sooriyakumar, Roy Perryman
Abstract: As a contribution towards improving the environment, a new position controller for vector controlled electric drives employing permanent magnet synchronous motors (PMSM) is presented that achieves approximately 27% less frictional energy loss than a conventional controller adjusted to give the same manoeuvre time for the same initial and final positions. The frictional energy loss minimisation is carried out within the constraint of a velocity-time profile of fixed form to achieve prescribed manoeuvre times for relatively large step reference position changes. Optimal settings of the parameters of the velocity-time profile are made to minimise the energy loss. The control system robustness is achieved through the use of two control techniques, forced dynamic control (FDC) and sliding mode control (SMC), which maintain the velocity-time profile regardless of the mechanical load presented to the motor. The closed loop system automatically enters a linear operational mode with prescribed dynamics as the demanded position is approached, enabling derivative feed forward pre-compensation techniques to eliminate dynamic lag if needed. Vector control is achieved by an FDC direct axis current control loop with zero reference input, assuming a non-salient PMSM. The only information required from the user is the reference position and the required manoeuvre time. For commissioning, no time consuming adjustment of PI controllers is needed in contrast to conventional vector controlled drives. Only the following parametric entries are needed: a) the motor power and voltage ratings, the permanent magnet flux, the number of pole pairs and an estimate of the total moment of inertia presented to the rotor, to calculate the maximum rotor angular acceleration magnitude for which no motor control torque saturation can occur and b) the settling time for the FDC direct axis current control. Since a specified manoeuvre time may be realised, the method is especially suited to applications in which more than one position control loop has to be coordinated. The performance of the new controller and its advantages over a conventional controller adjusted to yield the same settling time are demonstrated by simulations. Keywords:
Forced dynamic control, sliding mode control, synchronous motor drives, minimum energy manoeuvres.
Title of the Paper: The Influence of Disturbed Measured Values and Counter Pulses on Gas Volume Control
DOWNLOAD FULL PDF
Authors: Wacker H.D. and Boercsoek J.
Abstract: Firstly the authors explain the nature of contracts between primary suppliers of gas and local suppliers. They then describe and investigate an effect observed frequently in the field of gas volume and flow control. Instead of running a straight line, the volume controller opens or closes the control valve dramatically at the end of the accounting period. The effect turns out to be caused by a relative deviation of the measured value of the gas flow rate from the actual value, and it is explained by solving an easy differential equation. Rounding errors occurring during necessary calculations may lead to the same effect. In section 2 of their paper the authors introduce a more general linear differential equation to describe various kinds of perturbations simultaneously: relative and absolute deviations of the measured values from the actual values of the gas flow rate and pulses disturbing the pulses counting the standard volume flown so far. By solving the differential equation and analyzing the solution, the authors then explain the influence of the perturbations on the behaviour of the control valve. They too discuss the risk of running a peak load, i.e. of exceeding the contracted amount of gas.
Keywords: Gas Distribution System, Gas Supplier, Third Party Contract, electronic corrector systems, Standard Volume, Volume Control, Control Valve, flow rate, PID Control, Internal Set Point
Title of the Paper: Integrated Management and Optimization of the Sanitation Cycle Using
Intelligent Automation Systems and Communication Networks
DOWNLOAD FULL PDF
Authors: Marcelo De Souza, Sergio Luiz Pereira,
Caio Fernando Fontana and Eduardo Mario Dias
Abstract: The recognition of the importance of our planet’s water resources by human society increased
significantly during the last decade. With a growing population and environmental degradation, an efficient
management of water resources is even more vital to mankind. This article introduces a new systemic proposal
for an efficient management of water treatment stations and also the entire sanitation cycle. Maximizing the
efficiency of water resource management, as proposed in this article, requires the development and
implementation of an automation system based on intelligent systems and communication networks. Therefore,
the proposal of integrated management and optimization of the sanitation cycle presented in this article is a
contribution to the improvement of sustainability for human evolution.
Keywords: Automation, Management, Sanitation, Sustainability, Intelligent, Instrumentation, Communication
Networks
Issue 5, Volume 3, May 2008
Title of the Paper: Design and Fuzzy Control of Hand Prosthesis or Anthropomorphic
Robotic Hand
DOWNLOAD FULL PDF
Authors: Catrina Chivu, Catalin Chivu
and Catalin Georgescu
Abstract: Hand prosthesis and anthropomorphic robotic hand can be designed starting from the same
mechanical structure, actuating system and control system. Thus, it is useful to have software that helps the
engineers to design the optimum system. The present paper presents such software that includes one of the
possible mechanical structures used both in hand prosthesis and anthropomorphic robotic hands, the actuating
system and the control system. For control system was chosen the fuzzy control.
Keywords: hand prosthesis, anthropomorphic robotic hand, fuzzy control, design and simulation.
Title of the Paper: Romanian language and dialog systems
DOWNLOAD FULL PDF
Authors: Catrina Chivu, Catalin Chivu
and Catalin Georgescu
Abstract: The automated dialog systems are based on natural language processing, which has as main purpose
the development of language computing theory using knowledge specific to informatics field, as algorithms,
data structures, knowledge representation models and automat reasoning models. For many specialists in the
field, speech technology includes two main subfields: vocal synthesis and speech recognition. These two
subfields are complementary.
The present paper presents such a system developed for Romanian language.
Keywords: speech recognition, vocal synthesis, programming, prosthetics, neural network, MBroli, SAPI
Title of the Paper: Coordination of the Authority between the Vehicle Driver and a
Steering Assist Controller
DOWNLOAD FULL PDF
Authors: Liang-Kuang Chen and Bo-Jun Shieh
Abstract: Driver steering control performance varies with time during the vehicle driving course. A serial
vehicle steering assist controller is designed to provide steering correction that can compensate the difference
between the current driver and an “idealized” driver model. Using variable structure model reference adaptive
control, a robust adaptive controller for lane keeping assist is developed. To reduce the complexity in control
computations, a simplified version of the robust adaptive steering assist controller is also developed. Due to the
significant variations in human driver behaviour, the stability of the compensated system is not guaranteed and
conflict between the driver and the steering assist controller exist. A model predictive control based driver
model and a dual-loop structure driver model are employed to represent the variations in driver intention, and
the conflict between the controller and the driver is observed from computer simulations. A simple decision
making algorithm is implemented and the conflict situations are successfully avoided for different driver
behaviour modes and driving scenarios. Future work of this research will focus on implementing the designed
controller on a driving simulator and experiments with human drivers on the driving simulator.
Keywords: vehicle steering assist, driver interaction
Title of the Paper: Control Systems, Smart Sensors, Controller, Elements in a Control Loop,
Java Card and Security
DOWNLOAD FULL PDF
Authors: Nderim Zeqiri and Artan Luma
Abstract: An automatic control system is a preset closed-loop control system that requires no operator action.
This assumes the process remains in the normal range for the control system. Elements of automatic control.
Finding a transfer function for block Diagram of CNC machine-tool control system. The control system design
will attempt to evaluate the system response by determining a mathematical model for the system. We have
described the generalized schematic block-diagram for a closed loop, or feedback control system. Feedback
loop is the signal path from the output back to the input to correct for any variation between the output levels
from the set level. Programming serial and parallel port. The broad usage of Java language and Java Cards in
various different fields has made them quite applicable and implementable in different applications and
systems.
Keywords: Automation, Control, System, Serial port, Parallel port, Java, Security
Title of the Paper: Manuscript received Dec. 18, 2007; revised Mar. 10, 2008
DOWNLOAD FULL PDF
Authors: Jaswinder Singh and Aman Ganesh
Abstract: Process changes, such as flow disturbances and sensor noise, are common in the chemical and metallurgical
industries. To maintain optimal performance, the controlling system has to adapt continuously to these changes. This is a
difficult problem because the controller also has to perform well while it is adapting. The Adaptive Neural Controller
(ANC) developed in this paper satisfies these goals. Using a neural network controller, ANC modifies the network
parameters through Genetic Algorithms. Along with this a Fuzzy logic Controller is also implemented for the on-line
tuning of PID controller even in the presence of noise. The performance of these approaches has been evaluated using
data of different plants on a common set of performance indices. The simulations results show that identified GA based
Adaptive neuro-controller along with PID controller was able to adapt to process changes while simultaneously avoiding
hard constraints. The identified ANC balances the need to adapt with the need to preserve generalization, and constitutes a
general tool for adapting neural controllers on-line. While the fuzzy system which is rather simple to build and implement
(because of small computational efforts) considerably improves the system dynamics.
Keywords: Proportional-Integral-Derivative controller, Adaptive Neuro Controller, Genetic Algorithms
Title of the Paper: Possibility to Continuously Control the Tilt of Excavators with an
Inclinometer
DOWNLOAD FULL PDF
Authors: Florin Dumitru Popescu
Abstract: The main problem, on which emphasis is laid, is how to maintain the stability of rotor
excavators, the main machinery of a technological extracting system employed for coal mining, or
any other extraction machinery, in balance. The balance survey, respectively that of the stability of
these machineries is compulsory because the bearing surface is rather small compared to the other
building sub-systems outside the range of the surface, onto which much higher forces operate. The
lack of correct balance for the rotor excavators determines their operation in an inadequate dynamic
mode, or in extreme cases, there is the danger of losing stability by tilting over the excavator
respectively suffering huge material and human loss. Thus, these excavators have a mass of balance
theoretically measured during the production process. It is compulsory for the correctness of the
position and mass value of balance to be checked because there might be substantial error sources
leading to compromise the operation. For the machineries and installations that have a small bearing
surface compared to their height, an efficient control of balance can be done only if the angle of tilt of the
superstructure is known, and if the angle does not exceed certain values. The limit values of the angle of tilt
are determined by one condition, i.e. the composite force of both the interior and the exterior forces should
pierce the plan, which is bounded by the props of the machinery. In order to continuously measure the angle of
tilt of the superstructure, in any direction possible, recent studies highlight the possibility of using inclinometer
to be able to control the balance and respectively the stability of rotor excavators. By measuring the angle of
tilt for a structure considered rigid with the help of inclinometers, we are looking to evaluate the movement of
the center of gravity toward the interior of the bearing surface, which may have consequences on the stability
of the machinery. Thus a continuous control using computers over the tilt of the structure can be made
considering the two perpendicular directions, so as the limit value of the angle of stability is not exceeded.
Keywords: Barycentre, Inclinometers, Data acquisitioning card, Artificial horizon, Excavator
Title of the Paper: Controls Ways of the Transportation Capacity Variation for
the Canvas Conveyer
DOWNLOAD FULL PDF
Authors: Florin Dumitru Popescu
Abstract: Mining transportation is an important element of the economic efficiency rising in mining sector,
because the transportation average included in the cost of production for one tone of extracted coal, represents
approximately half of it. In order to control the transportation system and to have enough information about
the below-ground and the above-ground manufacturing process, it is necessary to keep a close look on the
transported output through the canvas conveyer.The permanent measurement of the mining material volume
controlled by continuous transporting equipment machines implies knowing its transversal section profile at a
given moment and the instantaneous velocity of the transporting belt conveyor. The approximation of the
material profile section is done by measuring the level of the transporting material in different points and
afterwards by approximating the corresponding curve through methods of numerical interpolation. In this
paper two approximation (interpolation) methods are presented: Lagrange and the spline functions method.
The present study wants to solve the problem by using some unconventional methods, in order to assure
reliability, precision, as well as the possibility of integrating it into the mining monitoring system. The
constant measurement of the cross section of the transported material through the canvas conveyer, as well as
of the belt speed, leads to the determination of the transported volume, and depending on it, knowing the
average density, you can determine the output.
Keywords: Interpolation, Lagrange, Spline, Polynomial, Function, Ultrasound Transducers
Title of the Paper: New PWM Switching Technique for an Optimum Inverter Operation
DOWNLOAD FULL PDF
Authors: Jasim. A. Ghaeb, Osama. M. Aloquili
Abstract: The main purpose of Pulse-Width –Modulation (PWM) technique in power inverters is to control the output voltage. The most familiar techniques: uniform-pulse-width-modulation and sinusoidal-pulse-width-modulation. A Small Boundary-Pulse-Width (SBPW) technique for improving the inverter performance is proposed. The new method is based on pulse-width technique. Varied pulse-widths for the middle and boundary pulses are produced, to obtain an improved inverter operation with less generation of harmonics. Simulation results show that the SBPW technique outperforms some of the traditional methods.
Keywords: Pulse-width–modulation (PWM) control, DC to AC inverters, Harmonic control, Energy conversion.
Title of the Paper: A Practical Approach to Control and Self-Localization of an Omni-
Directional Mobile Robot
DOWNLOAD FULL PDF
Authors: S. Ziaei-Rad, F. Janabi-Sharifi, M. Daneshpanah,
A. Abdollahi, H. Ostadi and H. Samani
Abstract: Due to their advantages, omni-directional mobile robots have found many applications especially in
robotic soccer competitions. Despite recent advances, effective control and self-localization of omni-directional
mobile robots remain as important and challenging issues. In this work, a practical approach for control and
self-localization of an omni-directional robot is proposed. For this purpose, a simplified model of the system is
derived for fast tuning of the control system parameters. In particular, strategies for fast tuning of PID/PD
coefficients for position and orientation control are devised. A vision-based self-localization and the
conventional odometry systems are fused for robust self-localization. The methods have been tested in the
RoboCup competition field using three Persia middle size omni-directional robots. The experimental results are
shown to demonstrate the effectiveness of the proposed system and its comparison with a few other compatible
approaches.
Keywords: Omni-directional, Mobile robot, Control, Self-localization.
Title of the Paper: Contact Force-Controlled SPM System Design with Fuzzy Controller
DOWNLOAD FULL PDF
Authors: Po-Kuang Chang and Jium-Ming Lin
Abstract: This research applied both the traditional PI (Proportion and Integration) compensator and the PD
(Proportion and Derivation) type fuzzy controller for a ccontact force-controlled Scanning Probe Microscope
(SPM) system design. In addition, the actuator hysteresis effect was taken into consideration. It can be seen
that the system performance obtained by the proposed fuzzy controller was much better, especially in
eliminating the actuator hysteresis effect. This improvement has been verified by MATLAB simulation and
practical implementation of a surface profiler.
Keywords: Scanning probe microscope, Force actuator, Hysteresis effect, Fuzzy controller
Title of the Paper: Mobile Satellite Antenna Tracking System Design
with Intelligent Controller
DOWNLOAD FULL PDF
Authors: Po-Kuang Chang and Jium-Ming Lin
Abstract: This research applied an intelligent controller for mobile satellite antenna tracking system design.
The intelligent controller is with both the traditional PI and the fuzzy control methods. The antenna tracking
and the stabilization loops were designed firstly according to the bandwidth and phase margin requirements.
However, the performance would be degraded if the tacking loop gain is reduced due to parameter variation.
On the other hand a PD type of fuzzy controller was also applied for tracking loop design. It can be seen that
the system performance obtained by the fuzzy controller was better for low antenna tracking gain. Thus this
research proposed an intelligent controller by taking both traditional PI and fuzzy controllers for antenna
tracking system design with appropriate weighting factors. The results show that the performances are better,
and the tracking gain parameter variation effect can be reduced.
Keywords: Antenna tracking loop, Stabilization loop, Fuzzy controller, PI compensator, Intelligent controller
Title of the Paper: Quality Evaluation Based Fuzzy Residual Modelling. Application in Hot Rolling
DOWNLOAD FULL PDF
Authors: Salah Bouhouche, Mostefa Yahi,
Benjam Hocine and Jurgen Bast
Abstract: On line quality evaluation is an important domain particularly in the complex processes where the characteristic of the product quality is difficult to measure directly. Evaluation based modelling techniques can be considered as an alternative to solve such complex problem. We consider in this work a contribution for product quality evaluation in hot rolling using fuzzy models. Residual changes are used to obtain an evaluation of product quality. Fuzzy rules are implemented in basis of the residual and first derivative changes. Application in hot rolling shows that this approach can be recommended as part of a tool of on line quality evaluation and classification.
Keywords: Fuzzy reasoning, On-line Quality Control, Quality Classification, Hot Rolling Process
Title of the Paper: Robust Control Strategy to Parameter Variations
for an Interior PM Synchronous Machine
DOWNLOAD FULL PDF
Authors: Vasile Horga, Dorin Lucache, Marcel Ratoi,
Alecsandru Simion and Mihai Albu
Abstract: The interior permanent magnet (IPM) synchronous machines have several desirable features for automotive, tools machines and residential drive applications. When operating over a wide speed range, the main problem is to assure a proper and automatically set flux weakening. The paper presents a control structure of an IPM synchronous machine proper to be used also in the motoring regime, generating regime or in an integrated starter-generator regime. The control algorithm assures insensitivity to the load parameters variation. Experimental results for both cranking and generation are shown and analyzed.
Keywords: synchronous machine, interior permanent magnet, flux weakening, vector control
Title of the Paper: Reconfigurable machine tool programming– a new approach
DOWNLOAD FULL PDF
Authors: A. Epureanu, F.B. Marin, V. Marinescu,
M. Banu and I. Constantin
Abstract: This paper presents a new programming approach based on a proposed hardware and control
architecture for the reconfigurable manufacturing tool machine. A new CAM is described based on virtual
machining algorithm that optimizes feedrate scheduling based on geometric simulation and aims to improve
the efficiency of cutting process developed using a reconfigurable machine, configured as lathe with a specific
architecture. A searching procedure is proposed to find the parameter values corresponding to cutter locations
along tool path during generation of the final surface.
Keywords: RMT programming, feedrate scheduling, reconfigurable machining system, numerical control,
optimal control, virtual machining
Title of the Paper: Online adaptive learning system for reconfigurable machine tool
DOWNLOAD FULL PDF
Authors: Marinescu V., Constantin I. C.,
Epureanu A., Banu M. and Marin F. B.
Abstract: Batch manufacturing is a widely used technique in today economy. The conceptual change of the
way in which the manufacturing machines are controlled is the most important aspect in which is possible to
conform with the market demands so their reconfigurability would not affect competitiveness. The problem to
be solved in this paper consists in a control method development for predictive control based on prediction of
the controlled variables deviation values in respect with their programmed values and also to predict the
process parameters for which chatter will appear. . The basic idea is to use the data set obtained by monitoring
the process during the manufacturing of the previous workpieces and during the current workpiece in order to
predict the controlled variable value and to train a clasiffier algorithm. The method proposed consists in
determining of the causal relation between one controlled variable and the monitored variables and then
predicting its value in order to compensate the deviation from the program.
Keywords: online learning system, reconfigurable machining system, adaptive control, predictive control,
error compensation, chatter, turning
Issue 6, Volume 3, June 2008
Title of the Paper: 3D Atmospheric Modeling based on MODTRAN4
DOWNLOAD FULL PDF
Authors: Ge Li, Zhifeng Lu, Gang Guo and Kedi Huang
Abstract: All the factors of atmospheric environment that influence the transmission of infrared radiation were analyzed in detail in the paper. Taking horizontally varying atmospheric property into consideration, a 3D model of atmospheric transmission of infrared radiation is established based on MODTRAN4. Moreover, the methods of calculating the ratio of atmospheric transmission, path radiation and single scatter solar radiation are presented. This 3D model is running by using the spectral database generated by MODTRAN4. It can handle attenuation of infrared radiation through the 3D atmosphere when target is below 60km. Implementation details are also presented.
Keywords: Infrared Radiation, Model, MODTRAN4, Path Radiation, Ratio of Atmospheric Transmission, Simulation, Single Scatter Solar Radiation
Title of the Paper: Structure Design and Indirect Adaptive General Predictive
Temperature Control of a Class of Passive HVAC
DOWNLOAD FULL PDF
Authors: Tawegoum Rousseau
Abstract: This study focuses firstly on the numerical investigation of an air conditioning unit prototype
developed to guarantee a microclimate with controlled temperature and relative humidity set points for
crop growth chambers. Numerical techniques based on Computational Fluid Dynamics (CFD) were
implemented to estimate component size and to analyze the flow characteristics of the mixed air
produced by the device. Simulations disclose a non-linear relationship between the air flow rate and the
aperture opening, and also show that the mixing zone was not perfect but could be improved by the
addition of baffles. The promising results obtained from CFD were used to improve the automation of
the device for potential application in closed greenhouses. Secondly, the indirect adaptive generalized
predictive control strategy (IAGPC) with a decentralized architecture was used to control the temperature
of the air conditioning unit. As the process involves time-varying, the use of a recursive estimation
approach with a fixed forget factor was adopted to estimate in real time the system parameters, and to
adapt simultaneously the GPC controller parameters. In order to achieve a local and global efficient
performance, the proposed decentralized IAGPC architecture was applied to two principal subsystems,
which compose the global unit. A significant real time experimental improvement in the system
performance is observed on temperature control for a wide range of operating points.
Keywords: numerical simulation, air flow distribution, time varying parameters, decentralized control,
adaptive control.
Title of the Paper: A Decision Method for Recognition in Video and Infrared
Multicameras System
DOWNLOAD FULL PDF
Authors: Cornel Barna
Abstract: This article presents an information fusion based decision method for a recognition system
composed by two video cameras and two infrared cameras. First, for each of video and infrared cameras
systems, geometric characteristics are obtained which in a second stage are used in three types of information
fusion. The decision, for determining the label of the object captured in the images is made using a soft type
rule by considering the original algorithm based on a modified Hebb-law. Comparing this result with a hard
method, it can be concluded that the performance of the presented soft method overtakes the hard one.
Keywords: Uncertainty, Information fusion, Video cameras, Infrared cameras, Soft and Hard decision
Title of the Paper: Constrained Model Predictive Control Implementation for a
Heavy-Duty Gas Turbine Power Plant
DOWNLOAD FULL PDF
Authors: Hadi Ghorbani, Ali Ghaffari and Mehdi Rahnama
Abstract: In this paper, model predictive control (MPC) strategy is implemented to a GE9001E gas turbine power plant.
A linear model is developed for the gas turbine using conventional mathematical models and ARX identification
procedure. Also a process control model is identified for system outputs prediction. The controller is designed in order to
adjust the exhaust gas temperature and the rotor speed by compressor inlet guide vane (IGV) position and fuel signals.
The proposed system is simulated under load demand disturbances. It is shown that MPC controller can maintain the rotor
speed and exhaust gas temperature more accurately in comprehension with both SpeedTronic™ control system and
conventional PID control.
Keywords: Gas turbine, Identification, ARX, Predictive control, Power plant, Modeling, Multivariable control, PID
|
|
|
