障板对于平板声辐射特性的影响分析

Analysis of the Influence of Baffles on Sound Radiation Characteristics of Plates

采用单层势和双层势求解和比较有障板和无障板的声辐射特性。由边界积分方程,分别推导有障板和无障板的声压积分方程,根据交界相容性条件,获取二重积分形式的平板表面声压和振速。进一步将结构的动力方程代入有障板和无障板形式的振速方程中,离散声压差值和板的位移为振动模态叠加的形式,获得二重积分形式的声辐射阻抗,从而求解振动模态系数,确定声辐射特性参数。以水下简支矩形板为例计算对比了声辐射参数,分析障板对薄板声辐射特性的影响。

The acoustic radiation characteristics of the baffle plates and plain plates are calculated and compared by single-layer potential and double-layer potential. Based on the boundary integral equation, the sound pressure integral equations of the two kinds of plates are deduced respectively. According to the compatibility condition on the boundary, the sound pressures and the vibration velocities of the plates are obtained. Further, the dynamic equation of the structure is substituted into the vibration equations in the form of the baffle plates and the plain plates. The sound pressure difference and the displacement of the plate surface are desecrated into the form of vibration mode superposition, and the acoustic radiation impedance of the double integral form is obtained. Then, the vibration mode coefficient and the sound radiation parameters are determined. With an underwater simply supported rectangular thin plate as an example, the effect of the baffle on the acoustic radiation characteristics is analyzed by comparing the acoustic radiation parameters of the two kinds of plates each other.