摘要
本文将修正的Helmholtz边界积分方程和结构有限元相结合,建立一种求解结构声辐射及物面动响应(包括物面法向速度和压力分布)的矩阵分析方法。对奇异积分采用级数展开并直接求其近似值的解析法。整个算法编制了计算程序。数值结果与试验结果两者吻合良好。应用此程序计算分析了加肋旋转壳(内有基座等结构)在多点简谐激振力作用下,不同结构阻尼比以及在基座面板减振器下方有无肘板等情况下壳体表面动响应及远场声压,得到了一些工程上有实用价值的结果。
Based on the modified Helmholtz integral equation and the structural finite element method, a matrix analytic method is presented for predicting the acoustic radiation and the dynamic responses of a submerged structure. An analytic formula is obtained by a series extension for evaluation of the singular integrals appeared in the boundary integral equation. The numerical predictions given by the present method are compared with the published theoretical and experimental results. Good agreements are obtained. The application is also made to a submerged ring-stiffened shell with engine foundation excited by multiple concentrated harmonic forces. The influence of the structural damping and the elbow plates of the engine foundation on the distributions of the acoustic pressure and the responses of the structure is briefly discussed.
出处
《中国造船》
EI
CSCD
北大核心
1992年第2期53-62,共10页
Shipbuilding of China
