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TECHNICAL PAPERS

Optimal Performance of Variable Stiffness Devices for Structural Control

[+] Author and Article Information
John Leavitt, James E. Bobrow

Henry Samueli School of Engineering, Department of Mechanical and Aerospace Engineering, University of California, Irvine, CA 92697

Faryar Jabbari1

Henry Samueli School of Engineering, Department of Mechanical and Aerospace Engineering, University of California, Irvine, CA 92697fjabbari@uci.edu

1

Corresponding author.

J. Dyn. Sys., Meas., Control 129(2), 171-177 (Aug 01, 2006) (7 pages) doi:10.1115/1.2432360 History: Received December 17, 2004; Revised August 01, 2006

This paper addresses control of structural vibrations using semi-active actuators that are capable of manipulating stiffness and∕or producing variable stiffness. Usually vibration suppression is achieved using damping devices rather than stiffness ones. However, stiffness devices can produce large forces and have significant advantages for shock isolation purposes. In this work we use a passivity approach to establish the requirements for the control law for a structure equipped with semi-active stiffness devices. We also solve an optimal control problem that demonstrates that our passive, resetting feedback control law approximates the optimal control. Simulation and experimental results are presented in support of the proposed approach.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic representing the variable stiffness device

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Figure 2

Variable stiffness device capable of 30,000lb output

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Figure 3

uv pulses for a short time while the actuator resets

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Figure 4

(a) Piston displacement versus time, (b) net actuator force versus time, and (c) force versus diplacement

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Figure 5

Resetting response of a single actuator

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Figure 6

Response of a single actuator to sine-wave base motion

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