Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (5): 1584-1589.doi: 10.13229/j.cnki.jdxbgxb20190561

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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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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

CLC Number: 

  • U476.1

Fig.1

Theory of beamforming sound location"

Fig.2

Sound propagation & drift in jet flow"

Fig.3

Example of sound error drift due to focus error"

Fig.4

Example of outer contour curve processing"

Fig.5

Approximation correction principle"

Fig.6

Speaker position"

Table 1

Focus error Δfn after approximation correction 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
00.7310.7310.7310.731
10.0060.0050.0050.007
2＜0.001＜0.001＜0.001＜0.001

Table 2

Sound source position ΔESn after approximation correction"

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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