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Evaluation of Ride Comfort in Time Domain by Using z-Transform

z변환을 이용한 시간영역에서의 승차감 평가

  • 김영국 (한국철도기술연구원 차세대고속철도기술개발사업단) ;
  • 김석원 (한국철도기술연구원) ;
  • 박찬경 (한국철도기술연구원) ;
  • 김상수 (한국철도기술연구원) ;
  • 김기환 (한국철도기술연구원)
  • Received : 2011.10.06
  • Accepted : 2011.12.05
  • Published : 2011.12.26

Abstract

In evaluating the ride comfort of railway vehicles, relationship between passenger's feeling and vibration characteristics is very important because human feeling is dependent on frequency spectrum of vibration. Therefore, the weighing curves in frequency domain are used to evaluate the ride comfort of railway vehicles. These curves have been defined in the Laplace transfer functions. It is necessary to convert the Laplace weighing function to the z weighing function in order to obtain the rms value in the time domain. In the present paper, we have applied Tustin's approximation to transform the Laplace weighing function to the z weighing and validated this method by reviewing the various cases.

Acknowledgement

Grant : 분산형 고속철도시스템 통합 및 총괄

Supported by : 국토해양부

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  1. Analysis of Comfort on Transition Curve based on the Measured Data vol.16, pp.5, 2015, https://doi.org/10.5762/KAIS.2015.16.5.3573