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|Type:||Artigo de evento|
|Title:||Improving The Sound Transmission Loss Of A Panel At Low Frequencies Using A Smart Foam|
|Abstract:||Smart foams have been tested since they were developed in the early nineties aiming at improving the transmission loss of aeronautical panels. They consist of a piezoelectric actuator (responsible for the active control) embedded in a passive foam material. The active noise control acts mainly in low frequencies complementing the attenuation of the foam, which is effective in mid and high frequencies. Recently, smart foams have been investigated using an indirect sound transmission loss control approach. In this work, experimental studies show how the application of a smart foam prototype embedded in a multi-layer panel (composed of an aluminum plate, the smart-foam, an air gap and a honeycomb layer) affects the sound transmission loss in low frequencies. The tests were performed with a plane and perpendicular wave incidence inside a plane wave tube with a quasi anechoic termination. The excitation is broad band random noise generated by a loudspeaker. The real- Time indirect transmission loss control was performed using the classical single input/single output Filtered-X LMS algorithm. The error sensor was positioned in two different locations: inside the multi-layer panel and outside it, 25mm downstream. Results show that the smart foam can increase the sound transmission loss at low frequencies. Copyright© (2013) by Austrian Noise Abatement Association (OAL).|
|Editor:||OAL-Osterreichischer Arbeitsring fur Larmbekampfung|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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