›› 2012, Vol. 42 ›› Issue (05): 1120-1126.

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Analysis and application of mode shape coupling characteristics of structural sound cavity coupled system

DENG Zhao-xiang1, GAO Shu-na1,2   

  1. 1. The State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400030, China;
    2. College of Engineering and Technology, Southwest University, Chongqing 400716, China
  • Received:2011-07-24 Online:2012-09-01 Published:2012-09-01

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Abstract: A formula for the interior sound pressure of the rectangular rigid box with a flexible wall and a new method to calculate the mode shape coupling coefficient by the finite element analysis were derived and validated. The particular points of the mode shape coupling coefficient were analyzed in detail, and it was found that the main factors affecting the coefficient are the mode shape similarity and complexity of the structural sound cavity in coupling surfaces which affect the coupling degree between the structure and acoustic field. The results were used to analyze and control the interior noise of a car, and the noise reduction of 5 dB was achieved at the driver right ear measuring point, providing an effective new method for low interior noise design of the car body.

Key words: vehicle engineering, structural sound cavity coupled system, mode shape coupling coefficient, finite element method, interior noise control of car

CLC Number: 

  • U467.493
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