On the approximation of sound radiation by means of experiment-based optical full-field receptances

This paper is focused on the exploitation of experiment-based optical full-field technologies in the sound radiation numerical simulation. Full-field receptance maps may cope with the challenges of the most advanced testing, useful to characterise, in the space and frequency domains, the specific structural dynamics of the actual set-up, with all the potential delays of the responses caught around the superposition of a modally dense dynamics, without the need of a FE model, especially in the case of lightweight structures or panels. The numerical approximation of the sound radiation field is here obtained by feeding the Rayleigh’s integral formulation with the full-field experiment-based receptances obtained from a simple thin rectangular plate, designed as a lightweight structure to retain a complex structural dynamics, with its real constraints and damping characteristics. Examples are given on the modal superpositions and on the contribution of the experiment-based full-field receptance maps to the accuracy of the radiated acoustic pressure fields.