关键词: 振动与波, 结构声强, 有限元, 功率流, 坐标变换

Abstract: Structural sound intensity vector diagrams present directly and visually the energy distribution and propagation of the points on shells surface. First of all, the formula for calculating structural sound intensity in local coordinate systems is deduced. By using coordinate transformation, the expression of the structural sound intensity in the global coordinate system is obtained. The sound intensity of a composite shell structure is calculated using FEM, and the sound intensity diagrams are obtained. The results show that the FEM used in this paper is very effective for analysis of the sound intensities of shell structures.

Key words: vibration and wave, structural sound intensity, vibration control, finite element, power flow, coordinate transformation