车身结构振动与车内噪声声场耦合分析与控制

车内低频噪声直接影响其乘坐舒适性，应用有限元和模态分析技术对汽车车身结构振动和车内噪声耦合问题进行了研究，利用有限元法找出车身结构动态特性和空腔声学特性，与试验模态结果进行比较，两者在低频范围内基本一致。在此基础上，应用声—固耦合理论对该车身结构振动与车内噪声耦合进行了研究，得出的结论为降低由结构振动引起的车内低频噪声提供了理论依据。

STUDY ON COUPLING BETWEEN BODY STRUCTURE DYNAMIC AND INTERIOR NOISE

The interior low frequency noise of passenger car has direct influence on its comfort. An attempt at applying the finite element method and modal test technique to the measurement and analysis on the vehicle body vibration and its interior noise is made,and the analysis conclusion is consistent with test result in low frequencies.By using the theory of coupling structural-acoustic system, a series ofresearches are carried out and some conclusion are drawn which could be very useful for the modification of the structural and acoustic for the vehicle reducing passenger compartment noise level especially at low frequencies.