A STRATEGY FOR PREDICTION AND ACTIVE CONTROL IN STRUCTURAL ACOUSTICS

This paper briefly reviews the prediction methods used in structural a coustics and presents a few concepts relative to active control of the vibrations and noise radiated by structures using distributed piezoel ectric actuators and sensors. The first part describes an investigate strategy for predicting the vibrations, internal noise and noise radia ted by complex structures in the low-, medium- and high-frequency doma ins. This introduces the different frequency domains and the appropria te prediction methods for each domain, the concept of structural compl exity, its role in dynamic behavior and its modeling. The second part, on active control, describes the principles of distributed active con trol in the case of closed-loop broad-band modal control. Finally, the paper concludes by reviewing the current limitations of prediction me thods and a few of the problems arising for distributed active control .