ZHANG Fan1, HUANG Yan1,2, LIU Qi3, HUA Chunrong1,2, YAN Bing1,2,DONG Dawei1,2, ZHENG Dong1,2
JOURNAL OF VIBRATION AND SHOCK. 2020, 39(7): 232-237.
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.