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《Journal of Vibration Engineering》 2005-04
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Acoustic design optimization for coupled acoustic-structural systems

ZHANG Jun~(1,2),ZHAO Wen-zhong~1,XIE Su-ming~1,ZHANG Wei-ying~2(1.Institute of Mechanical Engineering,Dalian Jiaotong University,Dalian 116028,China;2.Institute of Mechanical Engineering,Dalian Fisheries University,Dalian 116023,China)  
For the purpose of reducing structure-born noise,the finite element model of acoustic-structural coupled systems is biult and the acoustic response and sensitivity are calculated using Nastran FEM software under harmonic excitation.Then,the optimal geometric design of the structure is performed for the reduction of the acoustic pressure at interested positions and frequencies using the feasible direction method in iSIGHT optimization program.This method is applied to a plate coupled with a 3-dimension acoustic field as an example.The optimal thickness distribution is obtained with a 32.8 dB reduction of sound pressure level while the structural weight is relatively not changed.Results show that the optimal geometric design of the structural weight redistribution has an remarkabule efficiency on reducing noise.
【CateGory Index】: TB53
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