Experimental study on resonant acoustic damping for cabin noise reduction

Abstract

Abstract Toward the goal of overcoming the weight-and-space redundancy caused by simple implementations of various noise-reducing structures each with a single function, it is natural one of the effective solutions that combine the forms and performances of different noise-reducing structures subtly. To this end, we ingeniously blend the dynamic absorber and the damping material into one structure, which is denoted as the resonant acoustic damping (RAD). In this letter, we conducted several preliminary experiments on an aircraft cabin model to verify the effectiveness of RAD for vibration suppression and noise reduction on complex engineering structures. The experimental results show that RAD possesses a dual-effect feature, that is, the narrowband vibration absorption like dynamic absorbers and the broadband vibration suppression like damping materials.