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A. Patwardhan

Bio: A. Patwardhan is an academic researcher from University of Kentucky. The author has contributed to research in topics: Time domain & Nonlinear programming. The author has an hindex of 1, co-authored 1 publications receiving 2 citations.

Papers
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Proceedings ArticleDOI
21 Jun 1989
TL;DR: A new procedure for synthesis of dual-range linear controllers for use with nonlinear systems as well as linear systems with integrity is presented, which uses a factorization approach coupled with non linear optimization.
Abstract: In this paper we present a new procedure for synthesis of dual-range linear controllers for use with nonlinear systems as well as linear systems with integrity. The procedure uses a factorization approach coupled with nonlinear optimization. The procedure is demonstrated by solving an example problem.

2 citations


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Proceedings ArticleDOI
08 Oct 2007
TL;DR: In this paper, the authors focus on the problem of fault tolerant control for a Maglev suspension system based on simultaneous stabilization theory and propose a fault tolerant controller for highly nonlinear plants.
Abstract: This paper focuses on the problem of fault tolerant control for maglev suspension system based on simultaneous stabilization theory. Given two plants which are linear models of suspension system before and after the electromagnet failure respectively, we seek for a single compensator that stables both of them simultaneously. A systematic and simple linear control system design method for highly nonlinear plants is adopted. The simulation for the single magnet model shows that the designed fault tolerant controller has a better static and dynamic performance compared with a conventional PID controller. The method may provide valuable experience to the research on maglev suspension control system with more failures.

13 citations

Journal ArticleDOI
TL;DR: The method of simultaneous stabilization is used to design a single linear compensator that stabilizes a servo valve with significant nonlinear dynamics and the minimum gas flow rate achievable is improved by a factor of five when compared to conventional PI control.
Abstract: The method of simultaneous stabilization is used to design a single linear compensator that stabilizes a servo valve with significant nonlinear dynamics. The servo valve is part of an automotive exhaust gas recirculation system. Linear models of the response of a servo valve at distinct operating points are developed using the actual hardware. A simultaneous stabilizing compensator (c/sub ss/) is designed based on these models and implemented as an analog controller. The performance of the compensator is compared to results previously achieved using a conventional PI control scheme. As a result of the c/sub ss/ control's ability to stabilize the plant for small valve openings, the minimum gas flow rate achievable is improved by a factor of five when compared to conventional PI control, and valve response at high flows does not deteriorate. Several techniques for applying the method of simultaneous stabilization to real problems are presented.

9 citations