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Proceedings Paper

Modified LMS feed-forward control for vibration isolation with actuator limits
Author(s): Lei Zuo; Samir A. Nayfeh
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Paper Abstract

We propose a modified LMS algorithm for adaptive feedforward control with actuator limits. Unlike the leaky LMS method, which limits the controller effort by introducing an auxiliary cost, in the proposed algorithm we maintain the cost as the performance measurement. We derive the true stochastic gradient of the cost for systems with saturation with respect to the filter coefficients and obtain an adaptation rule very close to that of the filtered-x algorithm, but in the proposed algorithm, the reference filter is a time-varying modification of the secondary channel. In simulations of an active vibration isolation system with actuator limits, the proposed algorithm attains better performance than that attained by the leaky LMS algorithm.

Paper Details

Date Published: 16 May 2005
PDF: 8 pages
Proc. SPIE 5760, Smart Structures and Materials 2005: Damping and Isolation, (16 May 2005); doi: 10.1117/12.601484
Show Author Affiliations
Lei Zuo, Abbott Labs. (United States)
Samir A. Nayfeh, Massachusetts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 5760:
Smart Structures and Materials 2005: Damping and Isolation
Kon-Well Wang, Editor(s)

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