An error intensity spectral filtering method for active control of broadband structural intensity

The implementation of structural intensity measurement using an accelerometer array allows active attenuation of broadband frequency vibration using a modified filtered-x algorithm. In this work, a multi-input channel accelerometer error filter outputs a single channel error signal proportional to the propagating power. The filter is specified in the frequency domain as a transfer function from a model of bending waves in a finite beam. Integrity of the beam model and active control simulations is verified by monitoring an acceleration in the far field. The best overall performance is achieved when the error sensor array is in the far field of the primary and adaptive control force actuators. Broadband application of the intensity error technique in physical model-based simulations showed 15- to 25-dB attenuation except at a few isolated frequencies. These preliminary simulation results support new approaches to active stuctural control through error sensor array processing.