New numerical simulation method of shortwave track irregularity

LI Zai-wei; LEI Xiao-yan; GAO Liang

doi:10.19818/j.cnki.1671-1637.2016.01.005

Volume 16 Issue 1

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LI Zai-wei, LEI Xiao-yan, GAO Liang. New numerical simulation method of shortwave track irregularity[J]. Journal of Traffic and Transportation Engineering, 2016, 16(1): 37-45. doi: 10.19818/j.cnki.1671-1637.2016.01.005

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LI Zai-wei, LEI Xiao-yan, GAO Liang. New numerical simulation method of shortwave track irregularity[J]. Journal of Traffic and Transportation Engineering, 2016, 16(1): 37-45. doi: 10.19818/j.cnki.1671-1637.2016.01.005

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New numerical simulation method of shortwave track irregularity

doi: 10.19818/j.cnki.1671-1637.2016.01.005

LI Zai-wei^{1, 2, 3
,},
LEI Xiao-yan²,
GAO Liang³

1.
School of Urban Rail Transportation, Shanghai University of Engineering Science, Shanghai 201620, China
2.
Engineering Research Center of Railway Environmental Vibration and Noise of Ministry of Education, East China Jiaotong University; Nanchang 330013, Jiangxi, China
3.
School of Civil Engineering and Architecture, Beijing Jiaotong University, Beijing 100044, China

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Author Bio:
LI Zai-wei (1983-), male, associate professor, PhD, +86-21-67791163, lzw_5220964@163.com
Received Date: 2015-08-30
Publish Date: 2016-02-25

Abstract

Abstract

Aiming at the shortwave track irregularity problem, a numerical simulation method based on scattered binary wavelet was proposed.The relationship between ISO 3095 standard spectrum and wavelet coefficients was obtained with ISO 3095 standard spectrum as objective function.The algorithm flow and steps of numerical simulation were designed.Numerical simulation result and field measurement result for a subway section in Shanghai were compared.Analysis result shows that suitable wavelet decomposition level is eight and the lowest level covers the wavelength range of 512-1 024 mm.Time domain waveform of numerical simulation for shortwave track irregularity accords with the statistical characteristics of actual shortwave track irregularity and shows instability, its amplitude value distributes in the range of-0.15-0.15 mm.The difference between numerical simulation result and ISO 3095 standard spectrum results from the difference between octave sampling interval and 1/3 octave sampling interval.Using the binary wavelet transform can effectively realize the numerical simulation for shortwave track irregularity.Simulation result and test result are slightly different in amplitude and detailed wavform.It is suggested to do a large number of measurements and statistical analysis forshortwave track irregularity.
- subway track,
- wavelet transform,
- 1/3 octave analysis,
- shortwave track irregularity,
- numerical simulation

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References

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New numerical simulation method of shortwave track irregularity

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New numerical simulation method of shortwave track irregularity

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