Feedforward higher harmonic control of sound radiation

Robert L. Clark; Gary P. Gibbs

doi:10.1117/12.152794

8 September 1993 Feedforward higher harmonic control of sound radiation

Robert L. Clark, Gary P. Gibbs

Proceedings Volume 1917, Smart Structures and Materials 1993: Smart Structures and Intelligent Systems; (1993) https://doi.org/10.1117/12.152794
Event: 1993 North American Conference on Smart Structures and Materials, 1993, Albuquerque, NM, United States

Abstract

A new higher harmonic control approach is proposed for structural acoustic systems characterized by linear response to a nonlinear input disturbance. The algorithm is called the HLMS algorithm since it is derived from the filtered-x version of the least mean squares (LMS) algorithm. A single frequency reference signal correlated with that of the fundamental frequency of the input disturbance is all that is required to implement the controller. Simple trigonometric relationships are used to generate the remaining harmonics to be controlled in software as opposed to hardware. The filtered-x LMS algorithm is implemented in parallel for each frequency to be controlled, increasing the stability and rate of convergence for the higher harmonic control application. Results from the simulation confirm the applicability of the control approach for active structural acoustic control.

Citation Download Citation

Robert L. Clark and Gary P. Gibbs "Feedforward higher harmonic control of sound radiation", Proc. SPIE 1917, Smart Structures and Materials 1993: Smart Structures and Intelligent Systems, (8 September 1993); https://doi.org/10.1117/12.152794

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