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6th IFAC Symposium on Nonlinear control systems, NOLCOS 2004

作者： Janardhanan, S. Bandyopadhyay, B. IDP in Systems and Control Engg. IIT Bombay Mumbai India

This paper presents an output feedback based discrete-time sliding mode control strategy using the concept of a PdRd sliding sector. The resulting control is based on the system output and immediate past control input and is independent of the system states. It ensures that the norm of the system states decreases monotonically and continue to do so even with a zero input inside the designed sliding sector. Copyright © 2004 IFAC.

关键词： Sliding mode control

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Multirate output feedback sliding mode control of permanent magnet stepper motor using flatness property

Multirate output feedback sliding mode control of permanent ...

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2004 IEEE International Conference on control Applications

作者： Bandyopadhyay, B. Thakar, V.K. IDP in Syst. and Control Engineering IIT Bombay Mumbai India

The paper presents a method for output feedback sliding mode control for permanent magnet (PM) stepper motor which is known to be differentially flat system. Discretization of continuous time model of the stepper motor has been carried out and linearizing outputs are selected. Discrete state variables and control inputs are obtained in terms of linearizing outputs and their higher order differences. Linearized equations for the system are thus obtained and auxilary control is designed using reaching law approach. Then the actual control is obtained in terms of flat output and state variables. It has been shown that this can be expressed in terms of the flat output samples only. The control when applied to nonlinear system will give the same result as that of the state feedback case. © 2004 IEEE.

关键词： Sliding mode control

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Multirate output feedback discrete-time sliding mode control for a prescribed sliding sector

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IFAC Proceedings Volumes 2004年第13期37卷 603-608页

作者： S. Janardhanan B. Bandyopadhyay IDP in Systems and Control Engg. IIT Bombay Mumbai

This paper presents an output feedback based discrete-time sliding mode control strategy using the concept of a P d R d sliding sector. The resulting control is based on the system output and immediate past control input and is independent of the system states. It ensures that the norm of the system states decreases monotonically and continue to do so even with a zero input inside the designed sliding sector.

关键词： Discrete-time systems Multirate Output feedback Sliding-mode control

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Multirate output feedback sliding mode control of permanent magnet stepper motor using flatness property

Multirate output feedback sliding mode control of permanent ...

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IEEE Conference on control Technology and Applications (CCTA)

作者： B. Bandyopadhyay V.K. Thakar IDP Systems and Control Engineering IIT Bombay Mumbai India Research Scholar in IDP in Systems and Control Engineering IIT Bombay Mumbai India

The paper presents a method for output feedback sliding mode control for permanent magnet (PM) stepper motor which is known to be a differentially flat system. Discretization of continuous time model of the stepper motor has been carried out and linearizing outputs are selected. Discrete state variables and control inputs are obtained in terms of linearizing outputs and their higher order differences. Linearized equations for the system are thus obtained and auxiliary control is designed using reaching law approach. Then the actual control is obtained in terms of flat output and state variables. It has been shown that this can be expressed in terms of the flat output samples only. The control when applied to nonlinear system will give the same result as that of the state feedback case.

关键词： Output feedback Sliding mode control Permanent magnet motors Magnetic properties control systems Continuous time systems Magnetic variables control Nonlinear control systems Nonlinear systems State feedback

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Simulation, design, implementation and control of a welding process using micro-controller

Simulation, design, implementation and control of a welding ...

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Asian control Conference

作者： T.C. Manjunath S. Janardhanan N.S. Kubal Research Scholars IDP in Systems and Control Engineering Syscon Laboratory Indian Institute of Technology Bombay Mumbai Maharashtra India

This paper presents the design, fabrication of a microcontroller based resistance welding system which is used for performing a welding process. The paper is divided into 4 sections. First, a brief introduction to what is a welding, method of welding control such as resistance and spot welding is given. Secondly, the critical factors in the design of a welding process are dealt along with the principle of the welding process. Following this, the introduction to the design of the control scheme employed by us with the basic block diagram of the welding system and the functioning is presented. Thirdly, the design and development of the control software algorithm is dealt with. Finally, the conclusion is drawn along with its working and future improvements.

关键词： Spot welding Resistance heating Electric resistance Surface resistance control systems Current control Automatic control Condition monitoring Weight control Mass production

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Discrete sliding mode control of permanent magnet stepper motor using flatness property

Discrete sliding mode control of permanent magnet stepper mo...

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2003 European control Conference, ECC 2003

作者： Thakar, V. Bandyopadhyay, B. Interdisciplinary Programme in Systems and Control Engineering IIT Bombay Mumbai400 076 India

ISBN: (纸本)9783952417379

The paper presents discrete time sliding mode control (DSMC) for permanent magnet (PM) stepper motor which is known to be differentially flat system. Discretization of continuous time model of the stepper motor has been carried out and linearizing outputs are selected. Discrete state variables and control inputs are obtained in terms of linearizing outputs and their higher order differences. Linearized equations for the system are thus obtained and auxilary control is designed using reaching law approach. Then the actual control is obtained in terms of flat output and state variables. It is shown that system states reach to zero from given initial conditions. © 2003 EUCA.

关键词： Continuous time systems

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Discrete sliding mode control of permanent magnet stepper motor using flatness property

Discrete sliding mode control of permanent magnet stepper mo...

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European control Conference (ECC)

作者： V. Thakar B. Bandyopadhyay Interdisciplinary Programme In Systems and Control Engineering IIT Bombay Mumbai India

关键词： Mathematical model Switches Sliding mode control Windings Permanent magnet motors DC motors

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A QFT procedure for generating design frequencies and bounds of guaranteed accuracy

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Reliable Computing 2002年第6期8卷 427-451页

作者： Nataraj, Paluri S.V. Sheela, Suresh Mandir Systems and Control Engineering Department of Electrical Engineering IIT Bombay Bombay 400 076 India

In this paper, a QFT procedure is presented to systematically determine the following (i) the set of design frequency intervals from a given design frequency range, (ii) the controller bounds of prescribed accuracy at each design frequency interval, and (iii) the controller phase intervals for efficient bound generation at each design frequency interval. The procedure is given for the robust gain-phase margin specifications, based on several new results derived in the paper in the interval analysis framework. The procedure is demonstrated on a significant practical problem concerning the longitudinal motion of an aircraft.

关键词： Feedback control

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Extremum seeking loops with assumed functions: estimation and control

Extremum seeking loops with assumed functions: estimation an...

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American control Conference (ACC)

作者： R.N. Banavar Systems and Control Engineering IIT Bombay Maharashtra India

Extremum seeking (also peak-seeking) controllers are designed to operate at an a priori unknown set-point that extremizes the value of a performance function. Traditional approaches to the problem assume a time-scale separation between the gradient computation and function minimization and the system dynamics. The work here, in contrast, assumes that the performance function can be approximated by an assumed function with a finite number of parameters. These parameters axe estimated on-line and the extremum seeking controller operates based on these estimated values. To analyze our current scheme, quadratic functions or exponentials of quadratic functions are assumed as approximations to the performance function. A significant advantage of these functions is that they allow the peak-seeking control loop to be reduced to a linear system. For such a loop, the wealth of linear system analysis and synthesis tools can be employed. First, the control loop is analyzed assuming that the parameters in the function are known (full information case) and then when the parameters are estimated on line (the partial information case).

关键词： control systems Parameter estimation Linear systems control system synthesis Aerodynamics Stability Performance analysis control system analysis Information analysis Measurement

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control of longitudinal dynamics of aircraft using periodic output feedback

Control of longitudinal dynamics of aircraft using periodic ...

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IEEE International Conference on Industrial Technology (ICIT)

作者： M.K. Khan B. Bandyopadhyay Systems and Control Engineering IIT Bombay Mumbai India

In this paper, the problem of pole placement by periodic output feedback is presented. The poles of the discrete time control system could be assigned arbitrarily (with the natural restriction that they should be located symmetrically with respect to the real axis), provided that the number of gain changes is not less than the system's controllability index. Linearized models of aircraft are obtained at 10 different flight conditions and the controller is designed for controlling the longitudinal dynamics of aircraft using periodic output feedback. The family of 8 plants, representing the longitudinal dynamic, is also simultaneously stabilized. The controller consisted solely of gain elements and did not include a dynamical system, such as an observer, hence it is easier to implement on line.

关键词： Aerospace control Output feedback control systems Sampling methods State feedback controllability Time invariant systems Aircraft propulsion control engineering Time varying systems

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