Identification of Track Irregularity by Frequency-Domain Transfer Function

주파수영역 전달함수를 이용한 궤도틀림 식별

  • 김재천 (인하대학교 토목공학과) ;
  • 권순정 (코레일 연구원) ;
  • 윤경림 (인하대학교 토목공학과) ;
  • 이형진 (창원대학교 토목공학과) ;
  • 김만철 (한국철도기술연구원 차륜궤도연구실) ;
  • 신수봉 (인하대학교 토목공학과)
  • Published : 2009.08.30

Abstract

An algorithm for identifying track irregularities along the railway is presented. A baseline frequency-domain transfer function based on the equivalent SlSO(Single Input Single Output) model is defined at the intact condition between the measured track geometry of the ground displacement and the acceleration measured at a location in a train. The pre-defined transfer function at the intact condition is used inversely to predict track geometry in time with the currently measured acceleration at the same location in a train. The predicted track geometry is compared in time with that of the baseline values at the intact condition. The difference between them is calculated as an error in time and used to identify the track irregularities. An irregularity index is proposed as the ratio between the moving variance of the error at the current inspection and that at the intact condition. A 3D numerical simulation study has been carried out with a train model to verify the validity of the presented algorithm. In the analysis for the simulation, the track geometry has been considered as the displacement boundary condition varying in time.

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