基于声辐射模态确定声功率.pdfVIP

26 6 ( ) Vo.l 26 No. 6 2005 11 Journal of Jiangsu Univers ity( Natural Science Edition) Nov. 2005 姜 哲 (, 21201 ) : 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 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. : 声辐射; 声辐射模态; 声功率 : O42 : A : 1671- 7775( 2005) 06- 05 7- 05 Determ ination of acoustic pow er on acoustic radiation m odes JIANG Zhe (V ibration and Noise Research D ivision, Jiangsu University, Zhenjiang, Jiangsu 21201 , China) Abs tract: The acoustic rad iation modes provide an analysis method for the acoustic rad iation problem s. The acoustic rad iation 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 expan- sions of the acoustic rad iation modes. The acoustic pow er rad iated by a vibrating surface is the integral of acoustic intensity on a closed surface w hich surrounds the vibrating surface. Based on the acoustic rad-i ation modes and the acoustic field distribution modes, the formula for determ in ing the acoustic pow er ra- d iated from any vibrating surface is derived. The modal analysis in the acoustic rad iation problem s is enriched. For the radiation of a plate, the numeral calcu lation yields good results. K ey w ord s: acoustic rad iation; acoustic radiation modes; acoustic pow er , H ilbert, , , [ 5] .