不同壳体结构的加肋圆柱体声辐射特性分析

摘要

文章针对单层壳和双层壳加肋圆柱体，计算比较了在纵向单位力和垂向单位力激励下辐射声曲线。模型采用了自由边界条件。采用了三维水弹性方法，处理结构与流体之间的耦合问题。通过分析辐射声曲线的峰值与单个模态辐射声分量的关系，得出了对辐射声有主要贡献的优势模态。通过比较两种结构形式的辐射声曲线，得出各自声学性能的优缺点，对设计优化低噪声加肋圆柱体结构有着重要指导意义。%　　This paper aimed at the subject of calculating the acoustic radiation curves of stiffened cylinders with single shell and double shells under the two conditions of longitudinal unit force ex-citation and vertical unit force excitation. The free boundary conditions are applied to both sides of the models. Three-dimensional hydroelastic theory is applied to solve the fluid-structure interaction problems. By analyzing the peak values and their corresponded characteristic modes the structure key models, which mainly contribute to the acoustic radiation are obtained. The instruction of the acoustic optimization design of stiffened structures is given by comparing the frequency spectra of acoustic radiation of the two structures.