Active vibration isolation using adaptive feedforward control

• Published in: Proceedings of the 1997 American Control Conference (Cat. No.97CH36041) Vol. 3; pp. 1783 - 1788 vol.3
• Main Authors: Anderson, E.H., How, J.P.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 1997
• Subjects: Adaptive control; Algorithm design and analysis; Control systems; Laboratories; Numerical simulation; Programmable control; Space vehicles; Testing; Uncertainty; Vibration control
• ISBN: 9780780338326; 0780338324
• ISSN: 0743-1619
• DOI: 10.1109/ACC.1997.610892

The structure and performance requirements for active vibration isolation control systems motivate the use of adaptive control. This is especially true for spacecraft platforms subject to uncertainties inherent in on-orbit operation. This paper is an initial investigation into adaptive control strategies and algorithms that may have application to isolation on spacecraft platforms. Analysis of the algorithms, numerical simulation, and laboratory test data are used to evaluate adaptive feedforward control. Of particular interest are the performance characteristics and limitations of the filtered-x LMS (FXLMS) algorithm. The augmented error algorithm and combination feedback/feedforward control are two means investigated to extend the capabilities of FXLMS by desensitizing the algorithm to the specific dynamics of the plant. Several experiments were conducted on a laboratory testbed which serves as the prototype for a planned active vibration isolation flight demonstration.