动力总成振动对车内噪声的传递路径影响

为了研究动力总成振动对车内噪声的影响，在介绍传递路径分析基本原理的基础上，利用LMS/TPA软件，针对某轿车车内噪声存在问题的工况，以动力总成振动激励对车内噪声的传递路径分析为例，详述了传递路径分析的方法和步骤，并对影响车内噪声的动力总成悬置振动的主要传递路径进行了分析识别.结果表明，车内噪声主要是由动力总成振动激励引起，且动力总成右悬置Z向振动激励对车内噪声的贡献量较大.要降低该车型在上述工况下的车内噪声，应重点对动力总成右悬置Z向的隔振性能进行改进；运用传递路径分析方法不仅可以识别出各传递路径贡献量的幅值大小，还可以得到各贡献量幅值之间的相位关系，从而为动力总成各悬置设计提供依据.

Transfer path analysis of power train vibration on automotive interior noise

In order to research the influence of power train vibration on automotive interior noise,the principle of transfer path analysis(TPA) was introduced.The automotive interior noise which is caused by power train excitation was considered.The method and procedure of TPA were studied using LMS/TPA software.The dominant transfer path of mount vibration which has an influence on the interior noise was identified.The results show that the power train excitation influences the interior noise most,and the right mount in the Z direction has the most influence on interior noise.In order to reduce interior noise under this condition,the emphasis should be put on the right mount in order to better improve isolation performance.By applying the TPA method,the amplitude of every transfer paths’ partial contribution was identified and the phase relationship among the contribution amplitudes was given.This paper provides a basis for the design of power train mounts.