On the Sound Field Radiated by a Clamped Thin Circular Plate with an Artificially Radial Crack Based on FEM
Shi Huanwen,Shang Zhiyuan,Tian Hua
(Applied Acoustics Institute, Shaanxi Normal University Xi'an 710062)

Abstract: On the basis of the modal analysis by FEM, some relative parameters of every element on a clamped thin circular plate with an artificially radial crack are extracted. After the Rayleigh's integral is discreted, the axial pressure distribution and the pattern of the sound field on the spherical surface r=0.5m radiated from the crack plate are computed. It is shown that the radial crack doesn't only make the modes split into symmetrical and antisymmetrical modes about the crack except for the first mode, but also changes the distribution of the sound field remarkably. The validation of the method is illustrated by the sound field radiated from the intact circular plate, and it is suitable for computing sound field radiated from a circular plate with different kind of through crack.
Keywords: finite element method (FEM), artificial radial crack, sound radiated from a circular plate.