重型商用车驾驶室内噪声主要以中低频结构噪声为主，为确定驾驶室内结构噪声的主要贡献部件，建立重型商用车驾驶室有限元模型，通过实验模态与仿真模态对标，保证有限元模型的准确性。在此基础上利用声学传递路径分析方法，得到对驾驶室结构噪声贡献较大的钣金，并在钣金表面增加沥青阻尼板，通过仿真与实车试验验证，驾驶室内噪声降低1.0 dB(A)～1.5 dB(A)，证明分析方法是正确的，改进措施是有效的。%There are mainly low and medium frequency structural noises in operating heavy-duty commercial vehicle cabs. In this article, to identify the major contributing components which yield such structural noises, a finite element model which assimilates a heavy-duty commercial vehicle was established. Through the benchmarking of experimental modal and simulation modal, precision of the finite element model was verified. On this basis, the acoustic transmission path analysis was used to identify the mental plate which has a large contribution to the structure-borne noise of the cab. Afterwards, an asphalt rubber slab was attached to the surface of the mental plate. Through simulation and a real vehicle test, it was found that the noise in the cab is reduced by 1.0 dB (A)~1.5 dB (A). It is proved that the analysis method is correct and the improvement measure is effective.
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