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| Characteristic Analysis of Track Spectrums of Different Subway Line Conditions |
| HE Yue-lei 1，LI Zai-wei 1，SHENG Chun-ling 2，CHEN Xin 3 |
| 1 .Shanghai University of Engineering Science，Shanghai 201620，China;2. China Railway Airport Construction Group Corporation，Beijing 100093，China; 3.Tongji University，Shanghai 201804，China |
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Abstract Research purposes: Track irregularity is directly related to the subway train running stability and comfort. Track irregularity spectrums of different subway line conditions which contain ballastless track on elevated lines， ballasted track on ground lines and ballastless track on underground line were fitted and characteristics of which were compared for providing technical references to management of railway track quality and track dynamics analysis.
Research conclusions:(1)Track fitting spectrum using track irregularity spectrum model from China Academy of Railway Sciences and Levenberg-Marquardt method characterizes the original spectral characteristics well. (2)Subway track irregularity spectrum is with spectrum signature of broadband and narrowband random wave and some harmonic with complex periodic，different subway lines are with different spectrum signatures.(3)The condition of profile and align irregularity maintains well.(4)The research results could be used in track structure design and track maintenance.
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Received: 03 April 2014
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2014, Vol. 31 
