|Table of Contents|

Optimization of aerodynamic noise for vehicle alternator(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2015年06期
Page:
61-67
Research Field:
载运工具运用工程
Publishing date:

Info

Title:
Optimization of aerodynamic noise for vehicle alternator
Author(s):
ZHANG Ya-dong1;  ZHANG Ji-ye1;  DONG Da-wei1; 2;  YAN Bing2;  HUA Chun-rong2
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
Keywords:
vehicle engineering;  alternator;  aerodynamic noise;  large eddy simulation;  vector composition;  fan blade
PACS:
U467.493
DOI:
-
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. 3 tabs, 11 figs, 20 refs.

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