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26 April 1996 Reduction of the sound power radiation of a typical helicopter panel by the use of piezoceramic actuators
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"Design to Noise" is one of the new aspects considered during the planning phase of new aircraft, for different political, economical and enviromental reasons. In the low frequency range, active control seems to give the right answers to the needs. In propeller aircraft, active systems based on microphones-loudspeakers architectures5 have overtaken the classical methods based on the use of the Dynamic Vibration Absorbers.7 The problems of weight, cost and so on, could be solved by the application of "Smart Structures" , well summarised in many works and publications (e.g. C. Fuller6). Further work is being carried out at CIRA, on the use of piezoceramic devices as vibration actuators inside system architectures based on the approach known as Acousto Structural Active Control ( ASAC9'10). Recently, the attention of the aeronautical research world has been directed towards helicopters, where the acoustic problems are greater with respect to aeroplanes: extremely low frequencies involved, little noise insulation, etc. . . In addition, the inherent structural demands present some peculiarities, such as the use of large, flexible, composite elements, etc. .
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Luciano De Vivo and Antonio Concilio "Reduction of the sound power radiation of a typical helicopter panel by the use of piezoceramic actuators", Proc. SPIE 2779, 3rd International Conference on Intelligent Materials and 3rd European Conference on Smart Structures and Materials, (26 April 1996);

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