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TECHNICAL BRIEFS

Reliable Decentralized Servomechanism Problem for Large-Scale Systems

[+] Author and Article Information
Timothy Chang

Department of Electrical and Computer Engineering, New Jersey Institute of Technology, Newark, NJ 07102

Zhengfang Chen

 Motorola, Inc., South Plainfield, NJ 07080

J. Dyn. Sys., Meas., Control 128(2), 441-448 (Feb 03, 2005) (8 pages) doi:10.1115/1.2196420 History: Received January 24, 2003; Revised February 03, 2005

In this paper, the reliable control problem for decentralized systems is considered. It concerns the ability of closed-loop system to maintain stability and disturbance rejection properties during arbitrary sensor, controller, and actuator failure without being retuned. The notion of block decentralized robust servomechanism problem with complete reliability is first introduced to address systems with a block diagonal feedback structure. This is followed by establishing two conditions for reliability: (i) systems satisfying certain steady-state interaction characteristics or (ii) systems possessing minimum phase “block” transmission zeros. Accordingly, two types of decentralized controllers are applied to achieve reliable control for these two categories of systems. Simulation examples are also included to illustrate the properties of the reliable control system.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 1

Responsible under normal operation with decentralized PI control

Grahic Jump Location
Figure 2

Response under block 2 (left) and block 1 (right) failure with decentralized PI

Grahic Jump Location
Figure 3

Response under normal operation with decentralized PID1 control

Grahic Jump Location
Figure 4

Response under block 2 (left) and block 1 (Right) failure with decentralized PID1 control

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