某款压缩机啸叫引起车内异响的机理研究

针对某款车型在空调开启时车内产生异响的现象提出了解决和优化措施。通过试验证明了异响源为压缩机。通过理论仿真计算，发现该压缩机的转子-衔铁系统具有与异响频率相近的扭转模态频率，并且试验发现，发电机支架也具有与异响频率相近的结构自然模态频率。文章阐述了该车异响原因是由于上述二者模态频率相近，导致衔铁受到由皮带传来的发电机支架共振激励而产生扭转共振，进而引发车内压缩机排气噪声。结果表明，改进发电机支架和压缩机衔铁任意一处都能使压缩机啸叫和车内异响明显改善。

Research on the mechanism of vehicle interior abnormal sound caused by a certain compressor roaring

In this paper some solutions and optimization measures are put forward to solve the problem of abnormal sound in a certain type of vehicle when the air conditioner is open. The compressor is proved to be the main source of the interior abnormal sound when the Heating Ventilation and Air Conditioning System (HVACS) is turned on. Through simulated calculation, it is found that the torsional modal frequency of rotor-armature system is close to the frequency of abnormal sound, and the experimental results show that the natural mode frequency of the generator bracket structure is also close to the abnormal sound frequency. The cause of generating interior abnormal sound is explained, this is because the modal frequency of rotor-armature system is so close to that of generator bracket, which leads to the torsional resonance of the rotor-armature system and generating exhaust noise of compressor. Thus, improving the generator bracket or compressor armature can significantly reduce compressor roaring and vehicle interior abnormal sound.