Effects of near field terms on aerodynamic noise of the vehicle alternator
ZHANG Fan1, HUANG Yan1,2, LIU Qi3, HUA Chunrong1,2, YAN Bing1,2,DONG Dawei1,2, ZHENG Dong1,2
1. Engineering Research Center of Advanced Driving Energy-saving Technology Ministry of Education, Chengdu 610031, China；
2. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China；
3. Dongfeng Motor Corporation Technology Center, Wuhan 430056, China
Abstract：In order to investigate the influence of the near-field term (reflector, end cover and stator) on the aerodynamic noise of the vehicle alternator, this paper studies the aerodynamic noise characteristics of the alternator based on the Lighthill acoustic analogy theory, large eddy simulation (LES) method and boundary element method. The results show that the main orders and amplitudes obtained by the simulation are in good agreement with the experiments, which verifies the correctness of the simulation method, and the order 4, 6, 8, 9, 10 and 12 are the main orders of this type of alternator. the reflection surface has influence on all the main orders, the end cover mainly affects the 10th order, and the stator mainly affects the 6th and 9th order. The reflection has a great influence on the sound pressure level of the left and upper measuring points, the end cover has a great influence on the left and right measuring points, and the stator has almost no influence on each measuring point. The influence of the near-field term on the five-point average total sound pressure level is in the following order: reflector>end cover>stator.
张凡1,2，黄燕1,2，柳琦3，华春蓉1,2，闫兵1,2，董大伟1,2，郑东1,2. 近场项对车用交流发电机气动噪声影响分析[J]. 振动与冲击, 2020, 39(7): 232-237.
ZHANG Fan1, HUANG Yan1,2, LIU Qi3, HUA Chunrong1,2, YAN Bing1,2,DONG Dawei1,2, ZHENG Dong1,2. Effects of near field terms on aerodynamic noise of the vehicle alternator. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(7): 232-237.
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