简支矩形板在空气与水中声辐射特性比较  

Comparison of the Acoustic Radiation Characteristics of Simply Supported Rectangular Plates in the Air and in the Water

作　　者：朱拥勇[1] 刘宝[1] 

机构地区：[1]海军工程大学

出　　处：《噪声与振动控制》2016年第3期11-15,共5页Noise and Vibration Control

基　　金：国家自然科学基金资助项目(11372350);海军工程大学青年基金资助项目(HGDQNSQJJ13006)

摘　　要：研究比较简支矩形板在空气中与水中声辐射特性参数,分别建立结构在空气中与水中结构振动方程,并利用Rayleigh积分公式,表示结构表面声压,获得结构表面振速的求解方程。进一步由振动模态正交性和坐标变换,将声辐射阻抗化为二重积分形式,从而确定结构振动模态系数,获得结构声辐射特性参数。求取简支矩形薄板在空气中和水中辐射声功率、均方振速和声辐射效率,并对其进行对比。研究结果可为各类板结构振动与噪声控制提供理论参考。The acoustic radiation characteristic parameters of simply supported rectangular plates in the air and in thewater are studied and compared. The structural vibration equation in the air and in the water are established respectively. TheRayleigh integral formula is used to express the sound pressure of the structure surface, and the governing equation forvibration speed of the structure surface is obtained. By the orthogonal of the vibration modes and coordinate transformation,the acoustic radiation impedance is changed to a double integral form, so as to determine the structure’s vibration modecoefficients and the structure’s acoustic radiation characteristic parameters. Finally, the radiation sound power, the meansquare velocity and the radiation efficiency of a simple supported rectangular thin plate in the air and in the water arecalculated respectively and the results are mutually compared. This work can be applied to structural vibration and noisecontrol.

关 键 词：声学 声辐射阻抗 声辐射特性参数 介质 矩形板 

分 类 号：TB132[理学—物理]