Analysis of Radiated Sound from Arbitrary Configuration Solids Shocked by an Impulse (The Case in which a Given Impulse is applied to a Single Solid of Arbitrary Configuration)

摘要

Analysis method of radiated sound from arbitrary configuration solids shoked by an impulse is investigated mainly from the viewpoint of practical applicability. The analyses of vibrational response of solids and radiated sound from them are based on the Finite Element Method and the Boundary Element Method, respectively. And the both are formulated in the Laplace range and they are linked in such the meaning that the boundary conditions for BEM are directly given in this range by the Laplace transformed results of vibrational response of solids. The results of time domain of radiated sound and vibrational response are obtained by the numerical inverse Laplace transform using fast Fourier transform. As some examples of fundamental structure elements, straight and L -shaped beams, a circular plate and a ring are considered, and the theoretical results are compared with those of the experiments using the impulse hammer. It shows good agreement and it is proved that the proposed method is valid for practical use.