When a certain electric vehicle is driving at a constant speed of 40 km/h on the rough asphalt road, the rear passenger can obviously feel the ear pressure, which seriously affects the comfort. Through the analysis of objective data, it was found that the problem was caused by the road excitation, which leads to the coupling between the mode of the backup door and the mode of the acoustic cavity, and causes the resonance of the car cavity, thus causing the ear pressure sensation. To solve this problem, this paper optimizes the backup door by means of experiment and simulation, increases the dynamic vibration absorber, makes its modal frequency avoid the acoustic cavity modal frequency, and achieves the purpose of reducing the interior noise. After optimization, the vehicle noise is reduced by 8 dBA at 42 Hz under 40 km/h working condition of rough road surface, and the ear pressure sensation is reduced at the same time, thus improving the NVH (noise, vibration, and harshness) performance of the vehicle.

中文翻译：

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电动汽车低速道路噪声的分析与优化

当某种电动汽车在崎asphalt不平的沥青路面上以40 km / h的恒定速度行驶时，后排乘客显然会感觉到耳压，从而严重影响舒适度。通过对客观数据的分析，发现问题是由道路激励引起的，导致后备门的模式与声腔的模式耦合，从而引起车腔的共振，从而引起车厢共振。引起耳压感。为了解决这个问题，本文通过实验和仿真的方法对备用门进行了优化，增加了动态吸振器，使其模态频率避开了声腔模态频率，达到了降低室内噪声的目的。经过优化后，