求解水中加肋板声辐射特性的虚拟声源法*

发展一种利用虚拟声源离散声场的方法求解加肋板在水中的声振耦合问题。由波叠加原理和单元体积速度匹配的原则,根据离散的结构单元满足的动力方程和结构与介质的交界相容性条件,确定虚拟声源强度,计算结构的声辐射功率。本文以简支矩形加肋板为例,在不获得结构表面振速和声压的情况下,计算了结构在水中的声辐射功率,并与解析方法计算的结果进行了比较,表明了该方法具有较好的计算精度。

The virtual source method for computing the sound radiation power of submerged stiffened plate

An method with the use of virtual sound sources to discrete sound field is developed to solve the vibro-acoustic problem of a stiffened plate in water. Based on wave superposition principle and the principle of volume velocity matching , through structure vibration equation and boundary compatibility conditions satisfied by the structural units, the strength of virtual sound sources can be determined and the sound radiation power can be obtained. Without computing structural surface velocity and sound pressure, the paper gives an example of a rectangular stiffened baffled plate with simply supported boundary to calculate its sound radiation power. Through compared with the analytic result, it is shown that the mentioned method can ensure high precision.