General sound radiating structure: plate or sphere? Seminar

Sound radiation from a structure is intensively investigated since Rayleigh. Model structure widely used is a rectangular plate on an infinite baffle. This model is so ubiquitous that some of the key features are perhaps applied more broadly than is strictly justified.

Thus, an alternative simple model might be needed to reveal which features are robust and which do not generalize reliably. To address this issue, sound radiation from a spherical shell is compared with the plate radiation. The sphere encloses a finite volume, and consequently it might be a good model system for far-field radiation from structural vibration. On the other hand, the extreme symmetry of the sphere might make it unrepresentative. This problem is less familiar than the baffled plate. Thus, this work aims to fill some gaps and make a systematic comparison of the two systems.