分体式混动总成引起的轰鸣噪声源辨识与优化
Identification and Optimization of Interior Roar Noise Source Caused by Split Hybrid Assembly

针对某HEV混动车型样车在4000 rpm左右的转速时车内产生的轰鸣声问题，测试发现动力总成一阶弯曲模态偏低，通过对比同类型配置发现动力总成的弯曲模态发现，一阶模态是影响车内轰鸣、车身抖动问题的主要原因。本文对开发车型HEV混合动力总成LV1从增强结构刚度以及加强个部件之间的连接方面进行多方面的仿真分析和测试，以提升动力总成的一阶弯曲模态，发现采用新方案3的DHT壳体、两电机间支架连接以及油底壳改成铝壳的组合方案使一阶弯曲模态高于设计目标210 Hz。试验结果表明该方案在20~80 Hz范围内降低了15 dB (A)，并无啸叫，主客观评价均满足开发要求。
Aiming at the rumble problem occurs on a HEV hybrid model at about 4000 rpm, whose first-order bending mode of the powertrain is found low. By comparing the bending mode of the powertrain with the same configuration on other vehicles, the first-order mode is the main reason for the rumble and body jitter in this Hybrid Electrical Vehicle (HEV). The research about the development model powertrain LV1of HEV is to enhance the structural stiffness and strengthen the connection between the components of various aspects of simulation analysis and testing, and improve the first order bending mode of the powertrain. The results show the combination method of DHT housing, bracket connection between the two motors and oil sump changed to aluminum shell with new scheme 3 makes the first-order bending mode 210 Hz, which is higher than the design target. The experiment results show that the scheme reduces 15 dB (A) in the range of 20~80 Hz without noise, and both subjective and objective evaluation meet the development requirements.