基于声辐射模态确定声功率

利用声辐射模态方法研究了声辐射问题．以声辐射模态表示振动表面的多极子辐射，构成一组基函数，采用声辐射模态展开振动表面辐射的声场信息．在声场中，选择包围振动表面的封闭表面，振动表面辐射的声功率为声强在该封闭表面上的积分．基于声辐射模态和声场分布模态，推导了计算任意形状振动表面辐射声功率的计算公式，丰富了声辐射问题中的模态分析内容．针对平板辐射，数值计算结果令人满意．

Determination of acoustic power on acoustic radiation modes

The acoustic radiation modes provide an analysis method for the acoustic radiation problems, The acoustic radiation modes describe multi-pole radiation of a vibrating surface and constitute a set of basic functions. The field information about radiation from a vibrating surface can be obtained by expansions of the acoustic radiation modes. The acoustic power radiated by a vibrating surface is the integral of acoustic intensity on a closed surface which surrounds the vibrating surface. Based on the acoustic radiation modes and the acoustic field distribution modes, the formula for determining the acoustic power radiated from any vibrating surface is derived. The modal analysis in the acoustic radiation problems is enriched. For the radiation of a plate, the numeral calculation yields good results.