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本文用声强法对影响EQ140汽车驾驶室内噪声的因素进行识别,得出驾驶室的底板和前围部分的噪声辐射是影响室内噪声的主要声源,分析并测试了汽车上的主要噪声源对驾驶室噪声的贡献。通过用声功率激励和降噪处理前后的实车试验表明,其结果和声强法的结论是一致的。在此基础上,我们对EQ140汽车驾驶室内声场的声学特性进行研究,提出了降噪改进措施。
This paper uses the sound intensity method to identify the factors that affect the noise in the cab of EQ140 cab, and concludes that the noise emission from the cab floor and the front part of the cab is the main sound source that affects the indoor noise. The main noise sources on the car are analyzed and tested Contribution of cab noise. The actual vehicle tests before and after the acoustic power excitation and noise reduction show that the results are consistent with the sound intensity method. On this basis, we study the acoustic characteristics of the sound field of EQ140 car cab and put forward the measures to improve the noise reduction.