基于直接微分法的水下结构声学快速敏感度分析

陈磊磊 1,赵文畅 2,陈海波 2,肖琪聃 1

振动与冲击 ›› 2017, Vol. 36 ›› Issue (13) : 166-171.

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PDF(1006 KB)
振动与冲击 ›› 2017, Vol. 36 ›› Issue (13) : 166-171.
论文

基于直接微分法的水下结构声学快速敏感度分析

  • 陈磊磊 1 , 赵文畅 2,陈海波 2,肖琪聃 1
作者信息 +

Fast structural-acoustic sensitivity analysis based on direct differentiation method

  • CHEN Lei-lei 1   ZHAO Wen-chang 2  CHEN Hai-bo 2  XIAO Qi-dan 1
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文章历史 +

摘要

在降低结构振动噪声方面,结构声学优化方法展现了很高的应用潜力,并越来越受到研究者们的重视。通过结构声学敏感度分析建立辐射声场与结构材料属性和结构形状参数的关系,结合优化算法可设计出低辐射噪声和高声隐身性能的水下航行结构。发展耦合有限元法与快速多极高阶非连续边界元法进行流固耦合问题的敏感度分析,克服传统耦合算法的计算精度低,内存占有量高,难以进行大规模实际问题的计算等问题。设计变量可选为流体密度、结构密度、泊松比、杨氏模量、壳厚度和形状参数等。针对不同设计变量,采用直接微分法分别推导出结构声学系统和辐射声功率敏感度表达式。通过带有解析解的水下点激励球壳算例验证算法的正确性与有效性,并通过简化潜艇算例展示该算法在大规模实际问题上的应用潜力。

Abstract

The structural-acoustic optimization analysis is moving toward the field of vision for designer, because of exhibiting high potential in minimizing radiated noise, particularly for thin shell geometries. Acoustic design sensitivity analysis can provide insights into the effects of design variables on radiated acoustic performance. The coupled algorithm obtained by combining finite element and fast multipole higher order discontinuous boundary element is applied into the sensitivity analysis for the fluid-structure interaction problems. The proposed algorithm improves the calculation accuracy and decreases the memory storage. The design variable can be set as the fluid density, structural density, Poisson’s ratio, Yong’s modulus, structural shape size and so on. The sensitivity formulations for structural-acoustic system and radiated sound power with respect to the different design variables are derived based on the direct differentiation method, respectively. A numerical example with analytical solution is presented to demonstrate the validity and correctness of the proposed algorithm, and a complex practical example is presented to show the application ability of the proposed algorithm.

关键词

辐射声功率 / 敏感度分析 / 耦合有限元与边界元 / 非连续边界元

Key words

radiated sound power / sensitivity analysis / coupling FE/BE / discontinuous BE

引用本文

导出引用
陈磊磊 1,赵文畅 2,陈海波 2,肖琪聃 1. 基于直接微分法的水下结构声学快速敏感度分析[J]. 振动与冲击, 2017, 36(13): 166-171
CHEN Lei-lei 1 ZHAO Wen-chang 2 CHEN Hai-bo 2 XIAO Qi-dan 1. Fast structural-acoustic sensitivity analysis based on direct differentiation method[J]. Journal of Vibration and Shock, 2017, 36(13): 166-171

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