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《Journal of Engineering Design》 2010-06
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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)  
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.
【Fund】: 山东省自然科学基金资助项目(Q2006F04)
【CateGory Index】: TB535
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