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DIAGNOSIS OF FAULTS WITH VARYING INTENSITIES USING POSSIBILISTIC CLUSTERING AND FAULT LINES

IFAC Proceedings Volumes 2006年第2期39卷 905-910页

作者： K.P. Detroja R.D. Gudi S.C. Patwardhan Interdisciplinary Programme on Systems and Control Engineering Department of Chemical Engineering Indian Institute of Technology Bombay Powai Mumbai – 400076 India

In this paper, a new approach for fault detection and isolation that is based on the possibilistic clustering algorithm is proposed. Fault detection and isolation (FDI) is shown here to be a pattern classification problem, which can be solved using clustering and classification techniques. The possibilistic clustering approach was proposed to address some of the short comings of the fuzzy c-means (FCM) algorithm. The probabilistic constraint imposed on the membership value in the FCM algorithm is relaxed in the possibilistic clustering algorithm. Because of this relaxation, the possibilistic approach is shown in this paper to give more consistent results in the context of the FDI tasks. The proposed approach addresses the issue of correctly isolating a fault that may occur with varying intensities. The concept of fault lines is introduced, which in conjunction with possibilistic clustering has been effectively used for FDI. Fault signatures that change as a function of the fault intensities are represented as fault lines, which are shown to be useful to classify faults that can manifest with different intensities. The proposed approach has been validated here through simulations involving a co-polymerization reactor simulation.

关键词： Possibilistic clustering Fuzzy c-means clustering Gustafson-Kessel algorithm Fault Detection (FDD)

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FAULT DETECTION USING CORRESPONDENCE ANALYSIS: APPLICATION TO TENNESSEE EASTMAN CHALLENGE PROBLEM

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IFAC Proceedings Volumes 2006年第2期39卷 705-710页

This paper presents an approach based on the use of correspondence analysis (CA) for the task of fault detection and diagnosis. Unlike other tools (PCA / DPCA) that are used for this latter task, CA is shown to use a different metric to represent the information content in the data matrix X . Decomposition of the information represented in the metric is shown to yield superior performance from the viewpoints of data compression, discrimination and classification as well as early detection of faults. We demonstrate these performance improvements over PCA and DPCA on the Tennessee Eastman problem, which is a representative benchmark problem used in the literature. CA is shown to yield vastly superior performance for the monitoring of the TE problem, when compared with PCA and DPCA.

关键词： Correspondence Analysis (CA) Principal Components Analysis (PCA) Dynamic PCA (DPCA) Fault Detection (FD)

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Sliding Mode control Design via Reduced Order Model Approach

Sliding Mode Control Design via Reduced Order Model Approach

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IEEE International Conference on Industrial technology (ICIT)

作者： B. Bandyopadhyay Alemayehu G/Egziabher Abera S. Janardhanan Interdisciplinary Programme in Systems and Control Engineering Indian Institute of Technology Bombay Mumbai INDIA Division of Chemical and Biomolecular Engineering Nanyang Technological University Singapore Singapore

The paper presents the design of sliding mode control for the higher order system via reduced order model. It has been shown that a sliding mode control designed for the reduced order model gives similar performance f... 详细信息

关键词： Sliding mode control Reduced order systems control systems Sampling methods control design State-space methods Robust control Uncertain systems Frequency Proportional control

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Design and implementation of a novel technique of human speech recognition for a Robot

Design and implementation of a novel technique of human spee...

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SICE Annual Conference 2005

作者： Manjunath, T.C. IEEE SPIE IOP Interdisciplinary Programme in Systems and Control Engineering Indian Institute of Technology Bombay Powai Mumbai-400076 Maharashtra India

The primary purpose of this research work is to develop a speech recognition system, which will be capable of recognizing and interpreting an individual's voice. This will thus obviate the use of keyboards and other such input devices to output the data. The scope of this work is limited to the recognition of digits. Matlab, a versatile software tool is made use of for the processing of the signals. This processing involves filtering, shaping, correlating the speech signal which will enable the computer to interpret the commands given by the user. The signature of every spoken digit is unique from which we can derive the parameters which differ from digit to digit. These parameters serve as a concrete base for the implementation of a speaker independent voice recognition system. Using such parameters simultaneously and using probability concept the digits are sorted and arranged in the descending order of their probability. The digit with the highest probability is displayed. © 2005 SICE.

关键词： Speech recognition

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Design and implementation of remote equipment control using data acquisition and communication systems

Design and implementation of remote equipment control using ...

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SICE Annual Conference 2005

作者： Manjunath, T.C. IEEE/SPIE/IOP Interdisciplinary Programme in Systems and Control Engineering ACRE Building Indian Institute of Technology Bombay Mumbai-400076 Maharashtra India

The main objective of this work is to design, fabricate and implement remote equipment control system using communication system networks using transmitters and receivers. A data acquisition system is designed using microcontrollers in order to achieve full automation and the remote control is designed to enable the user to control the device, say a robot or any variable from a distance. © 2005 SICE.

关键词： Remote control

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Design of discrete event models using VHDL

Design of discrete event models using VHDL

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SICE Annual Conference 2005

作者： Manjunath, T.C. IEEE SPIE IOP Interdisciplinary Programme in Systems and Control Engineering ACRE Building Indian Institute of Technology Bombay Powai Mumbai-400076 Maharashtra India

Design is a complex process which can be thought of as a top down refinement of a specification. The main aim of this algorithm is to propose a VHDL code generator for real-time systems. Its importance lies in giving graphical interface to the designer. Here, a discrete event model for a digital circuit using VHDL is designed and implemented. © 2005 SICE.

关键词： Discrete time control systems

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Design, fabrication and implementation of a low-cost modular educational mobile robotic system

Design, fabrication and implementation of a low-cost modular...

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SICE Annual Conference 2005

作者： Manjunath, T.C. IEEE / SPIE / IOP Interdisciplinary Programme in Systems and Control Engineering ACRE Building Indian Institute of Technology Bombay Powai Mumbai-400076 Maharashtra India

The main objective of this work is to design, fabricate a modular simple low-cost indigenously developed educational full fledged robotic control system named as "MARS-6" that could accomplish 2 dimensional motion in a plane equipped with intelligence system (obstacle avoidance) along with a 4 DOF manipulator arm for PNP operations. A user-friendly assembly language module is designed for the operation of the system. The designed and fabricated mobile robotic system consists of a mobile trolley made of hard hylam over which the arm and the necessary interfacing circuitries are mounted. 8085 μP of 4.9152 MHz is used as the controller. Bi-directional DC servos are used to impart motion to the robot. Ultrasonic movement detectors upto 2 m range are designed to detect the obstacles. An infrared 10-channel remote control for 'teaching' the robot is designed and fabricated. Potentiometers and ADC's are used for position feedback. LCD display is used for the visual display of the user program. A +12 V lead acid rechargeable battery is used to provide DC power to the robot. The design of the MARS-6 is done at 3 levels, viz., Mechanical sub-system, Electronic sub-system, Software and working. © 2005 SICE.

关键词： Mobile robots

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Implementation of a microcontroller based temperature scanning control system

Implementation of a microcontroller based temperature scanni...

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SICE Annual Conference 2005

作者： Manjunath, T.C. IEEE SPIE IOP Interdisciplinary Programme in Systems and Control Engineering ACRE Building Indian Institute of Technology Bombay Powai Mumbai-400076 Maharashtra India

Most industrial processes function only within a specified temperature range. It is imperative in most process and control industries, that the temperature of the power electronic devices be maintained within its operating range for optimum performance. It is therefore important to know the temperature of various devices operating in industrial applications. This paper presents the design and implementation of a Microcontroller Based Temperature Scanner which is a device that can be used to measure temperature and display the temperature in centigrade directly on a seven segment display. It has the ability to measure temperature on eight different channels, provides for automatic scanning for all channels or allows the user the option to select the channel which he wants to scan. The designed device is used for measuring the temperature at different points of a system. The device, with the help of the RS-232 interface to a personal computer, can be used for data logging. It is also to be used along with support control circuitry to provide controller action. © 2005 SICE.

关键词： control systems

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Fuzzy logic controller design and implementation

Fuzzy logic controller design and implementation

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SICE Annual Conference 2005

作者： Manjunath, T.C. IEEE SPIE IOP Interdisciplinary Programme in Systems and Control Engineering ACRE Building Indian Institute of Technology Bombay Powai Mumbai-400076 Maharashtra India

This paper involves the design and implementation of an automated laundry in a firm. The laundry has a washtub having a capacity of about 60 kgs. The design incorporates special hardware to read the data from sensors in the tub like-the detergent should be added depending on the dirt and the weight of the clothes sensed from the tub;depending on the weight of the material to be washed, the water must come in through the inlet automatically;the number of wash-cycles will also depend on the dirt and the weight;The dirt level needs to be checked at the end of each cycle and if the dirt is below a desired value the process needs to be terminated automatically. A computer is to be used to perform the various calculations and to control and monitor all the stages of the project. The software is written to automate the operation employing the concept of fuzzy logic. © 2005 SICE.

关键词： Fuzzy control

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Design and implementation of a SCADA system using programmable logic controllers

Design and implementation of a SCADA system using programmab...

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SICE Annual Conference 2005

作者： Manjunath, T.C. IEEE SPIE IOP Interdisciplinary Programme in Systems and Control Engineering ACRE Building Indian Institute of Technology Bombay Powai Mumbai-400076 Maharashtra India

This paper presents the automation of a process by interfacing a weighing balance with Supervisory control And Data Acquisition System (SCADA) through a Programmable Logic controller (PLC). The research work was taken up as a part of the consultation work at a cigarette manufacturing firm. The detailed study of the entire cigarette manufacturing process revealed that after the processing of tobacco, which is the final stage in the production department, the processed tobacco is weighed in bins on a weighing balance and manually recorded by an operator. The operat or has to keep a count of the bins and sum them up at the end of the day. This involves consumption of time and human labor. The aim of our research work is to automate this process so that the information regarding various blends of cigarette and their respective weights can be made available at every PC terminal at the end of the day. For storing this information we are using the MS-Excel spreadsheet and writing in it with the help of SCADA script. The work discusses in detail the design, architecture, programming and implementation of a PLC. It also covers the various features offered by the SCADA software and also deals with the interfacing of the PLC and SCADA. The interface RS232C / RS485 is used. This work is an online research project which has now been implemented in the firm and yielding desired results. © 2005 SICE.

关键词： SCADA systems

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