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| Research and application of numerical methods on acoustic-structural coupled system |
| LI Li-Jun, LI Hong-Yan, GANG Xian-Yue, CHAI Shan |
| School of Traffic and Vehicle Engineering, Shandong University of Technology, Zibo 255049, China |
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Abstract Noise and vibration of mechanical equipments are important. Acoustic-structure coupling system is a common problem of multi-physics coupling in the field of mechanical noise and vibration. The paper researched acoustic-structure coupling system analysis methods, and provided some theory basis for structure and fluid coupling analysis. Acoustic-structure problem could be divided into two classes: strong coupling and weak coupling. The class should be selected based on coupling degree equation or engineering experience. Based on structural finite element method (FEM) and acoustic boundary element method (BEM), the authors have researched the coupling equations and flows of two coupling methods. Prominent noise and vibration CAE software was applied to analysis specific acoustic-structure coupling examples, and frequency response results of model with different coupling methods were obtained. The two results were almost identical in curve trend and peak value frequency. In high frequency domain, weak coupling method result was larger for ignoring damp of air to structural vibration. For thin wall structures, influence of air was so large that must be referenced, strong coupling method should be selected; for large mass or thick wall structures, weak coupling method could be selected. The results confirm the selection foundation of coupling method, and summarize two coupling method application range in engineering．
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Published: 28 December 2010
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声固耦合系统数值计算方法的研究与应用
机械设备的振动噪声控制至关重要,声固耦合问题是机械振动噪声分析领域常见的多物理场耦合问题.对声固耦合分析方法进行研究,为声固耦合分析提供一定的理论依据.声固耦合问题可分为强耦合与弱耦合两类,声固耦合方法可根据耦合程度计算公式或工程经验选择；基于结构有限元法与声学边界元法研究了2种耦合方法的耦合方程与耦合流程,采用主流的振动噪声分析软件对具体声固耦合实例进行分析,得到模型在2种不同耦合方法下计算的模型和场点的频率响应结果.2种耦合方式的计算结果在整个曲线走势与出现峰值的频率方面基本一致.在高频区域,弱耦合方法由于忽略了空气对结构振动的阻尼作用,计算结果的数值较大.对于薄壁结构,空气对结构的影响较大,应采用强耦合；对于质量或厚度较大的物体,可采用弱耦合.结果论证了声固耦合方法的选择依据,总结了声固耦合方法的应用范围.
关键词：
声固耦合系统,
有限元,
边界元,
模态
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