AN ERROR INTENSITY SPECTRAL FILTERING METHOD FOR ACTIVE CONTROL OF BROAD-BAND STRUCTURAL INTENSITY

The implementation of structural intensity measurement using an accele rometer array allows active attenuation of broadband frequency vibrati on using a modified filtered-x algorithm. In this work, a multi-input channel accelerometer error filter outputs a single channel error sign al proportional to the propagating power. The filter is specified in t he frequency domain as a transfer function from a model of bending wav es in a finite beam. Integrity of the beam model and active control si mulations is verified by monitoring an acceleration in the far field. The best overall performance is achieved when the error sensor array i s in the far field of the primary and adaptive control force actuators . Broadband application of the intensity error technique in physical m odel-based simulations showed 15- to 25-dB attenuation except at a few isolated frequencies. These preliminary simulation results support ne w approaches to active stuctural control through error sensor array pr ocessing. (C) 1997 Acoustical Society of America.