吉林大学学报(工学版) ›› 2020, Vol. 50 ›› Issue (5): 1584-1589.doi: 10.13229/j.cnki.jdxbgxb20190561

• 车辆工程·机械工程 • 上一篇    

风洞中未知声源漂移误差的逼近修正

沈哲1,2,3(),王毅刚2,3(),杨志刚1,2,3,4,贺银芝2,3   

  1. 1.同济大学 机械工程博士后流动站，上海 201804
    2.同济大学 上海地面交通工具风洞中心，上海 201804
    3.上海市地面交通工具空气动力与热环境模拟重点实验室，上海 201804
    4.北京民用飞机技术研究中心，北京 102211
  • 收稿日期:2019-06-04 出版日期:2020-09-01 发布日期:2020-09-16
  • 通讯作者: 王毅刚 E-mail:zhe.shen@sawtc.com;yigang.wang@sawtc.com
  • 作者简介:沈哲（1983-），男，博士，在站博士后.研究方向:车辆气动噪声.E-mail:zhe.shen@sawtc.com
  • 基金资助:
    上海市重点实验室项目(18DZ2273300)

Drift error correction of unknown sound source in wind tunnel using approximation method

Zhe SHEN1,2,3(),Yi-gang WANG2,3(),Zhi-gang YANG1,2,3,4,Yin-zhi HE2,3   

  1. 1.Postdoctoral Station of Mechanical Engineering, Tongji University, Shanghai 201804, China
    2.Shanghai Automotive Wind Tunnel Center, Tongji University, Shanghai 201804, China
    3.Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal Management Systems, Shanghai 201804, China
    4.Beijing Aeronautical Science & Technology Research Institute, Beijing 102211, China
  • Received:2019-06-04 Online:2020-09-01 Published:2020-09-16
  • Contact: Yi-gang WANG E-mail:zhe.shen@sawtc.com;yigang.wang@sawtc.com

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摘要：

风洞试验中外场声源定位因射流结构产生声源漂移，未知声源因位置不确定造成的定位焦距不准确将增大测量声漂移误差。本文基于几何声学理论推导，确定声漂移量误差与定位焦距误差成正比关系，基于此关系，针对固体表面目标声源空间分布情况，通过试验件外形几何关系建立声源位置函数，用逼近法获取更精准的定位焦距进而降低声漂移误差，其结果通过风洞试验验证。研究表明，此逼近法能快速降低定位焦距误差，消除由位置不确定带来的声漂移量误差。

关键词: 车辆工程, 风洞, 声漂移, 逼近法, 几何声学

Abstract:

In wind tunnel test, sound source drifts due to jet structure when locating in outfield. The measured sound drift error is enlarged due to inaccurate locating focus distance caused by uncertainty of sound source location. Base on geometric acoustics theory, this paper proofs that the acoustic drift error is proportional to the locating focus distance error. The position function of sound source is established using the surface geometric relationship of test piece according to the spatial distribution of the target sound source. More accurate locating focus distance is obtained by approximation method, thus, the sound drift error was reduced. The effectiveness of the method is verified by wind tunnel test. This approximation method can reduce the locating focus distance error apace and eliminate the sound drift error caused by location uncertainty.

Key words: vehicle engineering, wind tunnel, sound drift, approximation method, geometrical acoustics

中图分类号: 

  • U476.1

图1

相位传声器阵列识别声源的原理"

图2

射流中的声传播与声漂移"

图3

焦距误差引起声漂移计算误差示例"

图4

外轮廓曲线处理示意"

图5

逼近修正原理"

图6

扬声器位置"

表1

逼近后的焦距误差Δfn"

逼近次数nβ=-10° 前喇叭β=-10° 后喇叭β=+10° 前喇叭β=+10° 后喇叭
00.7310.7310.7310.731
10.0060.0050.0050.007
2＜0.001＜0.001＜0.001＜0.001

表2

修正后声源位置误差ΔESn (m)"

逼近次数nβ=-10°前喇叭β=-10°后喇叭β=+10°前喇叭β=+10°后喇叭
00.2210.2760.2380.253
10.0090.0120.0070.018
20.0090.0130.0070.018
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