摘要
为满足铁路轨道不平顺实时监测、时-频特征精细化提取和线路状态评估的需要,本文基于时-频联合分析基本理论,采用时-频能量密度方法描述轨道不平顺的时-频域分布性质,推导Wigner-Ville分布能量密度与轨道不平顺功率谱密度、TQI指标的数学联系,建立融合轨道谱和TQI指标基本物理特性的铁路轨道不平顺时-频能量联合分析方法,并分别从时域、频域和时-频域等角度验证方法的合理性。结果表明:本文提出的轨道不平顺时-频联合分析方法在时域病害峰值提取、轨道状态表征、频域特征波长统计与定位等方面正确、有效。
In order to meet the requirements for real-time monitoring of railway track irregularity,fine extraction of time-frequency characteristics,and assessment of railway line conditions assessment,this paper described the typical distribution characteristics of track irregularities in time-frequency domain through the conception of time-frequency energy density method based on the theory of JTFA（joint time frequency analysis）,and then deduced the mathematical connections among Wigner-Ville distribution energy density,track irregularity power spectrum density,and TQI（track quality index）.Lastly,the time-frequency energy joint analysis method,which integrated the basic physical characteristics of track spectrum and TQI for railway track geometry deformations,was established.The rationality of the method was verified from time domain,frequency domain,and time-frequency domain with the practical measured data.The results showed that the joint analysis method proposed in this paper is effective in time domain peak extraction of track diseases,track state characterization,statistics and positioning of characteristic wavelengths.
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2017年第4期9-16,共8页
Journal of the China Railway Society
基金
国家重点基础研究发展计划(973计划)(2013CB036205)
