一种基于流固耦合问题的低频散射声场预报方法

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (17) : 78-85.

论文

唐永壮，周其斗,谢志勇，刘文玺，赵鹏

作者信息 +

A method for low frequency scattering sound field prediction based on fluid-structure interaction

TANG Yongzhuang, ZHOU Qidou, XIE Zhiyong, LIU Wenxi, ZHAO Peng

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文章历史 +

摘要

提出了一种流固耦合作用下的低频散射声场预报方法。从边界积分方程出发，推导弹性散射中流固耦合方程，通过引入附加质量、附加阻尼、附加压力概念实现解耦。将弹性散射表述为纯刚性散射项与二次辐射项的叠加，建立了刚性散射与弹性散射的联系。与辐射问题不同，散射中流体对结构的作用不仅表现为附加质量和附加阻尼，还存在一个与结构响应无关的压力项，且该压力项是二次辐射项的激励源。采用Fortran编写了边界元算法程序，用DMAP语言实现与NASTRAN的对接，形成了完整的散射声场预报方法，通过与理论结果对比，验证了预报方法的正确性。圆柱壳散射的计算结果表明：低频散射时弹性不可忽略；圆柱壳厚度对弹性散射强度和指向性有明显影响；肋骨对柱壳散射的影响与振动形式有关，环肋骨对以弯曲模态为主的弹性散射影响很小。

Abstract

A method is purposed to predict the scattering acoustic pressure with fluid-structure interaction at low frequency. Based on the boundary integral equation, the formula coupled with fluid and structure in elastic scattering is established, then the concept of added mass, added damp and added pressure are used to solve the coupled equation. The relationship between rigid scattering and elastic scattering is studied, and the elastic scattering acoustic pressure is the superposition of rigid scattering and secondary radiation. Different with radiation, the effect of fluid acted on structure includes add pressure besides added mass and damp in scattering problem. The boundary element program is coded by FORTRAN and the DMAP of NASTRAN is used to connect the code with NASTRAN. Comparing the theoretical data and numerical result, the method is verified in this paper. The scattering pressure of cylinder with rib is computed, and the numerical results show that: The elastic effect cannot be ignored for scattering at low frequency. The thickness of shell has influence on scattering intensity and directivity patterns obviously while the effect of rib depends on the vibrational shape at particular frequency.

导出引用

唐永壮，周其斗,谢志勇，刘文玺，赵鹏. 一种基于流固耦合问题的低频散射声场预报方法[J]. 振动与冲击, 2023, 42(17): 78-85

TANG Yongzhuang, ZHOU Qidou, XIE Zhiyong, LIU Wenxi, ZHAO Peng. A method for low frequency scattering sound field prediction based on fluid-structure interaction[J]. Journal of Vibration and Shock, 2023, 42(17): 78-85

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