Damage-Mitigating Control of Mechanical Systems: Part II—Formulation of an Optimal Policy and Simulation

[+] Author and Article Information
Asok Ray, Min-Kuang Wu, Marc Carpino

Department of Mechanical Engineering, The Pennsylvania State University, University Park, PA 16802

Carl F. Lorenzo

NASA Lewis Research Center, Cleveland, OH 44135

J. Dyn. Sys., Meas., Control 116(3), 448-455 (Sep 01, 1994) (8 pages) doi:10.1115/1.2899240 History: Received September 16, 1992; Revised April 20, 1993; Online March 17, 2008


The objective of damage-mitigating control introduced in the first part of this two-part paper is to achieve high performance without overstraining the mechanical structures. The major benefit is an increase in the functional life of critical plant components along with enhanced safety, operational reliability, and availability. Specifically, a methodology for modeling fatigue damage has been developed as an augmentation to control and diagnostics of complex dynamic processes such as advanced aircraft, spacecraft, and power plants. In this paper which is the second part, an optimal control policy is formulated via nonlinear programming under specified constraints of the damage rate and accumulated damage. The results of simulation experiments for upthrust transient operations of a reusable rocket engine are presented to demonstrate efficacy of the damage-mitigating control concept.

Copyright © 1994 by The American Society of Mechanical Engineers
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