结构声腔耦合系统的振型耦合特性分析及应用  

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

作　　者：邓兆祥[1] 高书娜[1,2] 

机构地区：[1]重庆大学机械传动国家重点实验室,重庆400030 [2]西南大学工程技术学院,重庆400716

出　　处：《吉林大学学报（工学版）》2012年第5期1120-1126,共7页Journal of Jilin University:Engineering and Technology Edition

基　　金：“863”国家高技术研究发展计划项目(2006AA110102);中央高校基本科研业务费资助项目(CDJXS11110005)

摘　　要：推导并验证了带-柔性壁面的矩形刚性腔体结构的内部声压表达公式和一种振型耦合系数的有限元计算新方法。深入分析了振型耦合系数的特点,发现影响振型耦合系数的主要因素是结构声腔在耦合面上的振型相似程度和复杂程度,它们进而影响结构声腔振型耦合的强弱。本文基于振型耦合系数的特点,成功控制了某轿车车内噪声,使得驾驶员右耳测点噪声降低5dB,为轿车车身低噪声设计提供了一种有效可行的新方法。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.

关 键 词：车辆工程 结构声腔耦合系统 振型耦合系数 有限元法 车内噪声控制 

分 类 号：U467.493[机械工程—车辆工程]