Abstract
A new device has been developed to reduce structural vibrations and their associated radiated sound. The work is a contribution to the research of efficient and low cost devices that implement simultaneously the advantages of active and passive noise control techniques. A theoretical model was developed to investigate the potential of a new ‘‘active-passive distributed vibration absorber.’’ From this knowledge, prototypes have been designed and their potential experimentally investigated. The device subsequently developed can be described as a skin that can be mechanically and electrically tuned to reduce unwanted vibration and/or sound in a distributed manner. Preliminary results show that the new distributed treatment out-performs state-of-the-art point active-passive absorbers. The compact design and its efficiency make it suitable for many applications especially in the transportation industry. [Work supported by the ONR.]
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