Sensitivity based trajectory following control damping methods

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2013, 3(1): 127-143. doi: 10.3934/naco.2013.3.127

Sensitivity based trajectory following control damping methods

1.	McCoy School of Engineering, Midwestern State University, 3410 Taft Blvd., Wichita Falls, TX 76308, United States

Received December 2011 Revised November 2012 Published January 2013

Abstract
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Synthesis of trajectory following optimization methods with Lyapunov optimizing control techniques create continuous controls suitable for systems with switching surfaces. Fundamental contributions include the optimization structure from which the control law is derived and mitigation of undesirable system behavior. It is assumed the analyst is concerned with minimization of control effort and a positive definite function of the state. Disturbance rejection and stability are primary control objectives. Given these priorities, a cost functional with optimal control inspired structure due to the use of minimum cost descent control is constructed. It contains an analyst defined state dependent cost function. Another term is included which is a function of the control effort modified appropriately to reflect that sufficient control is needed to drive the state to a switching surface. This derivation establishes optimization rationale for disturbance rejection and switching surface placement. The control effort term provides for mitigation of finite time interval switching control; a continuous time analog to discontinuous chatter. A different perspective on chatter elimination via sensitivity analysis is provided and inspires the final ``control damping" algorithm.

Keywords: boundary layer methods, sensitivity, control damping., trajectory following optimization, Lyapunov optimizing control.

Mathematics Subject Classification: Primary: 93C10; Secondary: 93C15, 93C3.

Citation: Dale McDonald. Sensitivity based trajectory following control damping methods. Numerical Algebra, Control & Optimization, 2013, 3 (1) : 127-143. doi: 10.3934/naco.2013.3.127

References:

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References:

[1]	M. Ahmad and J. Osman, Robust sliding mode control for robot manipulator tracking problem using a proportional-integral switching surface,, Proc. of the Student Conference on Research and Development, (2003), 29. Google Scholar
[2]	M. Chen, Y. Hwang and M. Tomizuka, A state dependent boundary layer design for sliding mode control,, IEEE Trans. Aut. Cont., 47 (2002), 1677. doi: 10.1109/TAC.2002.803534. Google Scholar
[3]	M. Corless and G. Leitmann, Continuous state feedback guaranteeing uniform ultimate boundedness for uncertain dynamic systems,, IEEE Trans. Aut., ac-26 (1981), 1139. Google Scholar
[4]	R. Figliola and D. Beasely, "Theory and Design for Mechanical Measurements,", 4^th Edition, (2006). Google Scholar
[5]	B. Goh, Algorithms for unconstrained optimization via control theory ,, Journal of Optimization Theory and Applications, 92 (1997), 581. doi: 10.1023/A:1022607507153. Google Scholar
[6]	W. Grantham and T. Vincent, "Modern Control Systems Analysis and Design,", Wiley, (1993). Google Scholar
[7]	W. Grantham, Trajectory following optimization by gradient transformation differential equations,, Proc. 42^nd IEEE Conf. on Decision and Control, (): 9. Google Scholar
[8]	W. Grantham, Some necessary conditions for steepest descent controllability,, Proceedings of the 1^st American Controls Conference, (1982). Google Scholar
[9]	D. McDonald and W. Grantham, Singular perturbation trajectory following methods for min-max differential games,, in, (2006), 659. Google Scholar
[10]	T. Vincent and W. Grantham, Trajectory following methods in control system design,, Journal of Global Optimization, 23 (2002), 267. doi: 10.1023/A:1016530713343. Google Scholar
[11]	T. Vincent, B. Goh and K. Teo, Trajectory-following algorithms for min-max optimization problems,, Journal of Optimization Theory and Application, 75 (1992), 501. doi: 10.1007/BF00940489. Google Scholar
[12]	T. Vincent and W. Grantham, "Nonlinear and Optimal Control Systems,", Wiley, (1997). Google Scholar

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