Abstract: Low-frequency interior noise is important contents for improving the NVH quality of vehicle .To predict the major sources of low-frequency noise and reduce it have important means for the noise control. The low-frequency interior noise is predicted by using the method of ATV ,We also obtain the frequency response function and contributions analysis for the field point；Modal contributions are obtained by using the method of MATV, the bodywork which has high contributions for the field point is predicted by the modal result. The interior low-frequency noise was reduced in some extent after improvement. Theoretical foundation is supplied to reduce the noise in the interior of vehicle.

摘要： 车内低频结构噪声是汽车NVH 特性研究的重要内容，判断低频噪声的主要来源和降低车内低频噪声水平对于控制车内噪声有着重要意义。运用声传递向量（ATV）技术，对车内低频噪声进行预测仿真，得到场点频响函数并针对该场点进行面板贡献度分析；运用模态声传递向量（MATV）技术，进行车身结构模态贡献量分析，提取贡献较大的模态结果，进而预测对场点声压影响较大的车身结构。经过车身结构改进后，车内低频噪声得到一定程度抑制。为改进车内噪声水平提供一定的参考依据。

关键词: 声学, 车内低频噪声, 声传递向量, 模态声传递向量, 贡献量分析