Camera based Measurement of the Acoustic Radiation of Plates
* Presenting author
Abstract:
In this paper we study the application of high-speed cameras for the measurement of the acoustic radiation of (baffled) plates and plate-like structures, independent of their mechanical boundary conditions. High-speed cameras offer contact-less, transient and spatially dense displacement measurements. We use the measured displacement as boundary condition in an acoustic model (Rayleigh integral/ finite element model) to predict the radiated acoustic field. In case of a weakly coupled structure, the measurement is essentially independent of the acoustic environment. Potential applications consist of sound power measurements and vibro-acoustic virtual sensing. We conduct simulation based parametric studies to assess the influence of noise in the camera measurement onto the evaluated sound pressure. Furthermore, we show results from a comparison of the measured and simulated radiation (sound pressure/ sound power) of a steel plate up to 250 Hz.