Acoustic beamforming through a thin plate using vibration measurements

Overview & Synopsis

The aim of this paper is to propose a methodology to localize acoustic sources from the measurement of airborne induced vibrations of a thin structure. Targeted applications are the identification of acoustic sources through a thin wall , with a potential filtration of the incident field , which may be of practical interest for instance when identifying exterior acoustic sources from the inside of a moving vehicle. Two methods are coupled here to achieve this purpose : the Force Analysis Technique (FAT) , used to identify the parietal pressure field exciting the thin structure from vibration measurements , and beamforming , used for the localization of acoustic sources from the (FAT-) identified parietal pressure. The coupling of the two methods is studied first from a theoretical point of view , and an experimental proof of concept is then presented , showing the feasibility and relevance of the proposed approach .