Abstract
The experiment presented in this paper is to investigate and analyze the noise reduction at low frequency by lining the cavity between two panels of a finite double panel structure with porous material. The structural–acoustic coupled system of a sandwich structure backed by a rectangular acoustic cavity of rigid walls is discussed. It is found that the sound insulation of sandwich panels with air cavities containing and porous material is more effective than that of the single-layered panel at low frequency.. All rights reserved
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