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Research Papers

Experiments on Fault-Tolerant Active Vibration Control

[+] Author and Article Information
Tao Tao, Chakradhar Byreddy

 Vanderbilt University, Nashville, TN 37235

Kenneth D. Frampton

Institute of Sound and Vibration Research, University of Southampton, Southampton, SO17 1BJ, UK

J. Dyn. Sys., Meas., Control 130(6), 061006 (Sep 25, 2008) (8 pages) doi:10.1115/1.2977470 History: Received October 16, 2006; Revised May 17, 2008; Published September 25, 2008

The purpose of this work is to experimentally demonstrate a fault-tolerant active vibration control system. Active vibration control is achieved using piezoceramic sensors and actuators (transducers) that are attached to a simply supported beam. These transducers are used by a set of optimal H2 feedback compensators to minimize the lateral vibration of a beam. Actuator faults are detected and isolated with a Beard–Jones fault detection filter. This filter is a special case of Luenberger observer, which produces a residual output with specific directional properties in response to a system fault. In this current research work, a new Beard–Jones filter design methodology is introduced that permits its use on high-order systems and also on systems with feed-through dynamics. The output of this detection filter is monitored by a hybrid automaton that determines when faults occur. This hybrid automaton then directs the selection of a feedback compensator specifically designed for the detected system fault state. The result is a vibration control system that is capable of maintaining optimal performance in the presence of system faults.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 3

Experimental and analytical frequency responses from the disturbance to Sensor 1

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Figure 4

Basic block diagram of the H2 closed-loop system

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Figure 5

Block diagram of the Beard–Jones filter

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Figure 6

Block diagram of the Beard–Jones filter with hybrid automata

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Figure 7

Experimental result when Actuator 2 fails

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Figure 8

Experimental results showing (a) the disturbance input, (b) the BJ filter residual 1, and (c) the BJ filter residual 2

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Figure 9

Discrete residuals and finite state for Actuator 1 and 2 failures

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Figure 10

Sensor outputs when Actuators 1 and 2 fail

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Figure 11

Performance of the compensator in the frequency domain under nominal and faulty operating conditions

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Figure 12

Comparison of the performance of the controller for certain modes in the frequency domain under nominal and faulty operating conditions

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Figure 1

Schematic representation of the experimental setup

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Figure 2

Experimental setup for the FTC with multiple actuators/sensor pairs

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