ACTIVE VIBRATION CONTROL OF WAVES IN SIMPLE STRUCTURES WITH MULTIPLE ERROR SENSORS

A numerical study is carried out to determine the improvement in vibra tion control of simple structures gained by using two sets rather than one set of error sensors. The structures considered are a beam, a pla te, and a cylindrical shell. The control sources are driven to minimiz e the sum of the mean squared flexural displacement signal from all se nsors with the view to reducing downstream vibration transmission. Res ults show that over a large frequency range there is an overall improv ement in downstream attenuation resulting from the introduction of the second set of error sensors for each simple structure. (C) 1998 Acous tical Society of America.