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Decoupling and soft sensor design for a class of MIMO system

Journal of Applied Sciences 2012年第21期12卷 2273-2278页

作者： Subbulekshmi, D. Kanakaraj, J. Department of Instrumentation and Control Systems Engineering PSG College of Technology Coimbatore India Department of Electrical and Electronics Engineering PSG College of Technology Coimbatore India

The aim of this research was to maintain the interacting liquid level and temperature parameter values at the desired level. The design of decoupling and linearization algorithm (Hirschom's algorithm) and soft sensor techniques for an approximated model of an interacting thermal non-linear process is presented in this work. First the nonlinear interacting system was converted into linear non interacting system using decoupling and linearization algorithm. The soft sensor techniques such as the Kalman observer and the Unknown Input Observer (UIO) was then applied to estimate the system parameters namely level and temperature for a non interacting linear MIMO system. The obtained estimated error for the plant using UIO observer was less when compared to Kalman observer. © 2012 Asian Network for Scientific Information.

关键词： Linearization

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Vessel extraction in retinal images using multilevel line detection

Vessel extraction in retinal images using multilevel line de...

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IEEE-EMBS International Conference on Biomedical and Health Informatics, BHI 2012. In Conj. with the 8th Int. Symp.on Medical Devices and Biosensors and the 7th Int. Symp. on Biomedical and Health engineering

作者： Rattathanapad, S. Mittrapiyanuruk, P. Kaewtrakulpong, P. Uyyanonvara, B. Sinthanayothin, C. Department of ICT Sirindhorn International Institute of Technology Thammasat University Thailand Department of Mathematics Srinakharinwirot University Thailand Department of Control Systems and Instrumentation Engineering King Mongkut's University of Technology Thonburi Thailand National Electronics and Computer Technology Center NSTDA Thailand

ISBN: (纸本)9781457721779

This paper presents an algorithm to segment the blood vessels in retinal images. The contribution of this work is that we exhibit how a line detection can be applied in a multi-scale framework to fulfill the sophisticated task of vessel segmentation. The key idea of our algorithm is to systematically combine the outputs of Gaussian based line detection that is applied sequentially to the input image at several scales from coarse to fine levels. This brings down to the strategy that the evidences of larger size vessels are used to steer the process of addition of smaller vessels. Our proposed method is evaluated on the public DRIVE database and shows results with false positive rate. © 2012 IEEE.

关键词： Blood vessels

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Hirschorn's control algorithms for a non-linear chemical process with decentralized controllers

Hirschorn's control algorithms for a non-linear chemical pro...

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International Conference on Computing, Electronics and Electrical Technologies (ICCEET)

作者： D. Subbulekshmi J. Kanakaraj Department of Instrumentation and control systems Engineering PSG College of Technology Coimbatore India Department of Electrical and Electronics Engineering Coimbatore India

This paper presents Hirschorn's algorithm (decoupling and linearization algorithm) for a approximated model of interacting thermal non-linear process. Closed loop simulation was carried out incorporating the above algorithm and the results are compared. control performance of a Hirschorn's is found to give better results. Obtained control laws for Hirschorn's algorithm shows relatively good results. The control laws obtained for Hirchorn's algorithm gives improved Settling time (Ts) and Integral Square Error (ISE).

关键词： Heating Radio frequency

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Approach to gasoline engine faults diagnosis based on crankshaft instantaneous angular acceleration

Approach to gasoline engine faults diagnosis based on cranks...

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International Carpathian control Conference (ICCC)

作者： Binh Le Khac Tuma Jiri Department of Control Systems and Instrumentation Faculty of Mechanical Engineering VSB Technical University of Ostrava Ostrava Czech Republic

Gasoline engine is a complex power generating machines and used widely in automotive industry, which the failure rate is high. Carrying out the gasoline engine fault diagnostic methods have been studied and still a lasting topic for scientists. Crankshaft instantaneous angular acceleration, which evaluated by second derivative of the crankshaft rotation respect to time contains information for fault diagnosis. In this paper, phase modulation signal is derived from the phase of an analytical signal which evaluated by using the Hilbert Transform technique. To verify the signal analysis technique, the engine model created originally by John J. Moskwa needs to be extended to produce fluctuation of the crankshaft angular acceleration and to implement the extended model into the dSPACE equipment to control and diagnose the engine.

关键词： Engines Acceleration Petroleum Velocity control Torque Fault diagnosis Rotation measurement

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Impact dynamics of a finger mechanism with application to onset of a cart motion

Impact dynamics of a finger mechanism with application to on...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Hwan Taek Ryu Jae Yeon Choi Byung-Ju Yi Department of Electronic Electrical Control and Instrumentation Engineering Hanyang University South Korea Department of Electronic Systems Engineering Hanyang University South Korea

In impact dynamics, coefficient of restitution (COR) is an important parameter to calculate the impulse. Generally, COR has been assumed a constant value. However, COR varies according to the colliding condition. In order to apprehend this phenomenon, analysis of impact dynamics is conducted using a 3-DOF finger mechanism. The external impulse exerted on a wall or a cart by the mechanism is a function of the robot's geometry and dynamic parameters. In this paper, we derive an analytical model of COR with the 3DOF finger model colliding to a wall and a cart, and emphasize that the actual motion just after impact is not the same as what we expected unless the variable COR is considered. The effectiveness of proposed COR model is verified through wall and cart impact experiments using the finger mechanism.

关键词： Fingers Silicon Rubber Mathematical model Robots Analytical models

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Discrete-time sliding mode control using an H∞ filter for a quadruple tank system

Discrete-time sliding mode control using an H∞ filter for a...

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2012 12th International Workshop on Variable Structure systems, VSS 2012

作者： Chandra, Kumar Pakki Bharani Srikanthan, Hemnath Gu, Da-Wei Bandyopadhyay, Bijnan Postlethwaite, Ian Control and Instrumentation Group University of Leicester LE1 7RH United Kingdom Department of Engineering University of Leicester LE1 7RH United Kingdom Interdisciplinary Program in Systems and Control Engineering Indian Institute of Technology Bombay Mumbai 400076 India Northumbria University NE1 8ST United Kingdom

The quadruple tank system is a challenging multi-variable model consisting of four interconnected tanks, two level sensors and two input pumps. This paper deals with the control and estimation of such a system. All the four levels of the system are controlled by H∞ filter based discrete sliding mode control (SMC). A nonlinear stable sliding surface is constructed using full state information, to enhance the overall performance of the closed loop plant. In this multi-input multi-output quadruple tank system, only the first two states are available for feedback and hence it is not suitable to use any full state feedback control methods directly. To circumvent this problem, the remaining two states, which are required for the SMC design are estimated using a robust H∞ filter. The efficacy of the proposed method is demonstrated by simulations. © 2012 IEEE.

关键词： State feedback

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Traffic signs detection using blob analysis and pattern recognition

Traffic signs detection using blob analysis and pattern reco...

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International Carpathian control Conference (ICCC)

作者： Jaromir Zavadil Jiri Tuma Vitor M. F. Santos Department of Control Systems and Instrumentation VSB Technical University of Ostrava Ostrava Czech Republic Department of Mechanical Engineering University of Aveiro Aveiro Portugal

Computer vision has been increasingly used as a tool for orientation of machines in unknown areas. This paper deals with the challenge of perceiving traffic signs for autonomous driving. It is concerned with the competition of fully autonomous robots that takes place in a track with the shape of a traffic road. A specific set of signs has been addressed and solved with very good results. A combination of two techniques based on blob analysis and pattern recognition has been used and selected results of the experiments are presented along with the description of the main algorithms. Introduction also contains a brief research of work that has been already published in this area of engineering.

关键词： Robots Shape Image color analysis Green products Feature extraction Pattern recognition Educational institutions

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Agent-based cyber control strategy design for resilient control systems: Concepts, architecture and methodologies

Agent-based cyber control strategy design for resilient cont...

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2012 5th International Symposium on Resilient control systems, ISRCS 2012

作者： Rieger, Craig Zhu, Quanyan Başar, Tamer Instrumentation Control and Intelligent Systems Idaho National Laboratory Idaho Falls ID United States Coordinated Science Laboratory Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign 1308. W. Main St. Urbana IL United States

ISBN: (纸本)9781467301633

The implementation of automated regulatory control has been around since the middle of the last century through analog means. It has allowed engineers to operate the plant more consistently by focusing on overall operations and settings instead of individual monitoring of local instruments (inside and outside of a control room). A similar approach is proposed for cyber security, where current border-protection designs have been inherited from information technology developments that lack consideration of the high-reliability, high consequence nature of industrial control systems. Instead of an independent development, however, an integrated approach is taken to develop a holistic understanding of performance. This performance takes shape inside a multi-agent design, which provides a notional context to model highly decentralized and complex industrial process control systems, the nervous system of critical infrastructure. The resulting strategy will provide a framework for researching solutions to security and unrecognized interdependency concerns with industrial control systems. © 2012 IEEE.

关键词： Networked control systems

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Applications of sliding observers for FDI in aerospace systems

Applications of sliding observers for FDI in aerospace syste...

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International Workshop on Variable Structure systems, VSS

作者： Christopher Edwards Halim Alwi Prathyush P Menon Control and Instrumentation Research Group Department of Engineering University of Leicester Leicester UK Centre for Systems Dynamics and Control Mathematical Research Institute University of Exeter Exeter UK

This paper presents applications of second order sliding mode observer schemes to three different aerospace problems. Two relate to ADDSAFE aircraft fault detection benchmark problems. Firstly, the detection and isolation problem associated with an actuator jam/ is considered and secondly an actuator oscillatory failure case is tackled. For the actuator jam scenario the actuator deflection becomes decoupled from the demand issued from the flight control computer and remains fixed at some uncommanded point. For the OFC problem, the reconstruction scheme requires an estimate of rod speed provided by a second order sliding mode observer. Ideally low gains in the observer are required because of the noisy environment associated with the physical system. An adaption scheme is therefore required to retain sliding in the presence of severe faults. A problem associated with fault detection in a formation flying scenario, associated with satellites is also discussed. This application to a relative degree two problem would be difficult to solve using linear observer methods.

关键词： Actuators Satellites Observers Benchmark testing Solids Elevators Equations

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Monitoring of oxygen content in flue gas at coal fired power plant using cloud modeling techniques

Monitoring of oxygen content in flue gas at coal fired power...

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IEEE instrumentation and Measurement Technology Conference

作者： Xiaojuan Han Cheng Cheng Yueyan Chen Yong Yan Department of Control and Computer Engineering North China Electric Power University Beijing China Instrumentation Control and Embedded Systems Group School of Engineering and Digital Arts University of Kent Canterbury Kent UK

The accurate measurement of oxygen content in flue gas at coal fired power plant is important for realizing closed-loop control and optimization of combustion processes. A cloud model is incorporated into the measurement of oxygen content in flue gas. A qualitative and quantitative transformation fusion model based on the cloud model theory is established. The oxygen content in flue gas from real-time measurement at coal fired power plant is estimated using traditional arithmetic average, weighted mean fusion method as well as cloud model theory. Practical tests were undertaken to determine the oxygen content in the flue gas by using the three methods for practical operating data. The test results show that the proposed method produces more accurate measurement values than the one given by the arithmetic mean of a finite number of sensors.

关键词： Generators Zirconium Clouds Sensors Measurement uncertainty Boilers Coal

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