复合环境激励下的声振耦合分析  

Sound-vibration Coupling Analysis under Combined Environment

作　　者：王珺[1] 张景绘[1] 宁玮[1] 

机构地区：[1]西安交通大学航天航空学院,西安710049

出　　处：《振动与冲击》2011年第2期15-18,共4页Journal of Vibration and Shock

基　　金：国防973基金资助项目(61355)

摘　　要：基于有限元和边界元理论,建立了仪器舱典型结构的耦合模型,分析了声振耦合对结构响应的影响。当典型结构经受随机振动+混响声场复合环境激励时,采用随机分析的原理,用谱分析的分析方法定性的分析结构的动力响应情况,推导了节点响应谱密度的计算公式,解决了Sysnoise软件同时对声振复合环境进行数值模拟的问题。仿真结果表明:声振耦合影响结构的响应,且在各频率上影响程度不同,在低频时较弱,相当于附加阻尼的效果,随着频率的升高,耦合程度随之加强,改变了结构的响应分布;对声振复合环境数值模拟,在低频部分,随机振动激起的响应占主要部分,随着频率的升高,混响声场激起的响应占主要部分,混响声场激起的模态数也要多于随机振动激起来的。Based on the coupled finite element and boundary element method,a numerical simulation computing simultaneously a structural vibration and its associated acoustic field was presented.A new approach integrating discrete structural-acoustic methods with stochastic analysis for computing the vibro-acoustic behavior of a cabin structure subjected to random excitation from a shaker plus a reverberant acoustic field was presented.With the mathematical formulas deduced the nodal response power spectral density（PSD） of the coupled model under random vibro-acoustic combined environment could be calculated,the problem that could not be calculated with SYSNOISE at the situation when the structure was suffering two different kinds of random excitations simultaneously was solved.The results showed that the effect of structural-acoustic coupling is equivalent to an added damping effect in lower frequencies,with the increase in frequency,the effect becomes obvious;for the case of vibro-acoustic combined environment,in lower frequency part,the response is mainly caused by random excitation,while in higher frequency part,the modes excited by the reverberant field are more than those induced by random excitation.

关 键 词：有限元 边界元 随机分析 声振耦合分析 数值模拟 

分 类 号：O324[理学—一般力学与力学基础] O421[理学—力学]