管道及消声器声学特性的边界元法计算  

APPLICATIONS OF THE ROUNDARY ELEMENT METHOD FOR CALCULATING ACOUSTIC PERFORMANCE OF DUCTS AND MUFFLERS

作　　者：季振林 张志华[2] 马强[2] 

机构地区：[1]南京大学声学研究所,南京210093 [2]哈尔滨船舶工程学院动力工程系,哈尔滨150001

出　　处：《计算物理》1996年第1期1-6,共6页Chinese Journal of Computational Physics

基　　金：黑龙江省自然科学基金资助课题

摘　　要：从流体力学的基本方程出发,导出了等截面管内具有平均流和线性温度梯度时的三维声传播方程,然后采用迭代法将其化成可用边界积分方程表示的形式,最后用边界元法求解。由边界元法计算消声器的四极参数,从而可预测传递损失等声学特性。文中计算了膨胀腔的传递损失,并与一维理论结果进行了比较.The governing equation of three-dimensional sound propagation in an uniform duct with mean flow and linear temperataure gradient is derived,based on the foundamental equations of aerodyna- mics.By using the interation method,the sound propagation equation is expressed as the case which can be computed numerically with the boundary element method.The four-pole parametes of a muffler can be obtained using BEM,therefore the acoustic per.formance such as transmission loss can be predicted.The transmission loss of an expansion chamber has been calculated and compared with the result obtained by means of the one-dimensional theory.

关 键 词：声传播 平均流 温度梯度 边界元法 

分 类 号：O422[理学—声学]