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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,得出驾驶室地板和前围两面的噪声辐射是室内噪声的主要声源.并分析测试了汽车发动机、冷却风扇,消声器、空气动力以及轮胎噪声对驾驶室内噪声的影响.由声功率激励试验和实车降噪处理前后的试验表明,其结果和声强法的结论是一致的.在此基础上,我们对EQ140汽车驾驶室内的声学特性进行了分析研究,提出了降噪改进的措施.
This paper uses the sound intensity method to identify the factors that affect the noise inside the cab of the EQ140 cab and finds out that the noise radiation on both sides of the cab floor and the front fences is the main source of the indoor noise.Analyzing and testing the car engine, cooling fan, muffler, air Power and tire noise on the cabin noise.According to the results of sound power excitation test and actual vehicle noise reduction before and after the test, the results are consistent with the sound intensity method.On this basis, we EQ140 car cab The acoustic characteristics were analyzed and studied, and the noise reduction measures were put forward.