传递矩阵-边界元方法预报水下旋转薄壳振动和声辐射

A Combined Transfer Matrix and Boundary Element Method for Predicting Vibration and Sound Radiation of Submerged Revolutionary Shell

本文从弹性力学的有矩薄壳理论和声学的亥姆霍兹积分形式解出发,提出以传递矩阵-边界元方法数值预报水下任意形弹性旋转薄壳受谐和力激励下振动和声辐射.文中以水下球壳作为典型模型对计算程序进行了验证计算,并以流线形壳体尾部受激振动为例,对其辐射声指向性进行了数值预报和实验测量,计算结果与实验结果基本吻合.从而表明这种数值预报方法在工程上的可行性.

A combined transfer matrix and boundary element method (CTBM) is presented for predicting the vibration and sound radiation of a submerged revolutionary shell by harmonic force.The results of CTBM show a good agreement with the results of special function method, where a submerged spherical shell is used as a typical example.Then, the sound radiation from a streamlined revolutionary shell is studied, where a point harmonic force acts upon the tail-end of the shell.When the sound radiation of excitor is considered, the results of CTBM agree well with the experime-ntal results.It shows that the CTBM is one of effective methods for predicting the vibration arid sound radiation of a submerged revolutionary shell.