이동 프레임 음향 홀로그래피를 이용한 주행 중인 차량의 베어링 결함 위치 추정Bearing Faults Localization of a Moving Vehicle by Using a Moving Frame Acoustic Holography

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This paper deals with a bearing faults localization technique based on holographic approach by visualizing sound radiated from the faults. The main idea stems from the phenomenon that bearing faults in a moving vehicle generate impulsive sound. To visualize fault signal from the moving vehicle, we can use the moving frame acoustic holography [Kwon, H.-S. and Kim, Y.-H., 1998, “Moving Frame Technique for Planar Acoustic Holography,” J. Acoust. Soc. Am. Vol. 103, No. 4, pp.1734~1741]. However, it is not easy to localize faults only by applying the method. This is because the microphone array measures noise(for example, noise from other parts of the vehicle and the wind noise) as well as the fault signal while the vehicle passes by the array. To reduce the effect of noise, we propose two ideas which utilize the characteristics of fault signal. The first one is to average holograms for several frequencies to reduce the random noise. The second one is to apply the partial field decomposition algorithm [Nam, K.-U., Kim, Y.-H., 2004, “A Partial Field Decomposition Algorithm and Its Examples for Near-field Acoustic Holography,” J. of Acoust. Soc. Am. Vol. 116, No. 1, pp.172~185] to the moving source, which can separate the fault signal and noise. Basic theory of those methods is introduced and how they can be applied to localize bearing faults is demonstrated. Experimental results via a miniature vehicle showed how well the proposed method finds out the location of source in practice.
Publisher
한국소음진동공학회
Issue Date
2009-08
Language
Korean
Citation

한국소음진동공학회논문집, v.19, no.8, pp.816 - 828

ISSN
1598-2785
URI
http://hdl.handle.net/10203/96471
Appears in Collection
ME-Journal Papers(저널논문)
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