Optimization of aerodynamic noise for vehicle alternator

ZHANG Ya-dong; ZHANG Ji-ye; DONG Da-wei; YAN Bing; HUA Chun-rong

doi:10.19818/j.cnki.1671-1637.2015.06.008

Volume 15 Issue 6

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ZHANG Ya-dong, ZHANG Ji-ye, DONG Da-wei, YAN Bing, HUA Chun-rong. Optimization of aerodynamic noise for vehicle alternator[J]. Journal of Traffic and Transportation Engineering, 2015, 15(6): 61-67. doi: 10.19818/j.cnki.1671-1637.2015.06.008

Citation:

ZHANG Ya-dong, ZHANG Ji-ye, DONG Da-wei, YAN Bing, HUA Chun-rong. Optimization of aerodynamic noise for vehicle alternator[J]. Journal of Traffic and Transportation Engineering, 2015, 15(6): 61-67. doi: 10.19818/j.cnki.1671-1637.2015.06.008

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Optimization of aerodynamic noise for vehicle alternator

doi: 10.19818/j.cnki.1671-1637.2015.06.008

1.
State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
2.
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

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Author Bio:
ZHANG Ya-dong(1987-), male, doctoral student, +86-28-86466040, aliyzyd@163.com

ZHANG Ji-ye(1965-), male, professor, PhD, +86-28-86466040, jyzhang@home.swjtu.edu.cn
Received Date: 2015-07-30
Publish Date: 2015-12-25

Abstract

Abstract

The large eddy simulation method and the FW-H acoustic model were adopted to simulate the aerodynamic noise of vehicle alternator.The vector composition method was used to optimize the front-blade distribution angle of alternator.Aiming at low noise, high flow and optimizing spectrum structure to reduce the single-frequency rotational noise, the aerodynamic noise properties of alternator were analyzed.Analysis result shows that the numerical simulation and test results have good consistencies on sound pressure level, main influencing orders and magnitudes of alternator noise.The aerodynamic noise sources of vehicle alternator are front and back blades.The main influencing orders of overall noise are orders 6, 8, 10, 12 and 18, and the main energy centers on 1 120-5 600 Hz.The maximum prediction error of overall noise is 6.97 dB, and the prediction errors of rotational noise on orders 12 and 18 are 2.30 dB and 3.30 dB respectively.After optimizing the front-blade distribution angle of alternator, the maximum decreasing amount of overall noise is 3.10 dB, the average decreasing amount is 2.58 dB, the average decreasing amounts of noise on orders 12 and 18 are 5.80 dB, so the noise reduction effect is remarkable.
- vehicle engineering,
- alternator,
- aerodynamic noise,
- large eddy simulation,
- vector composition,
- fan blade

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References

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Optimization of aerodynamic noise for vehicle alternator

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