Journal of the Korean Society for Railway (한국철도학회논문집)

The Korean Society for Railway (한국철도학회)
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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
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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.

철도차량의 승차감은 승객이 느끼는 감정이므로 물리적인 진동의 크기뿐만 아니라 인간의 감응도(느낌)도 고려하여야 하며, 이러한 진동에 대한 인간의 감응도를 나타낸 것이 주파수 보정곡선이다. 주파수 보정곡선은 라플라스 변환형태의 전달함수이기 때문에 이 전달함수를 직접 사용하여 시간 영역에서의 승차감의 평가가 불가능하다. 이를 해결하기 위해서 본 논문에서는 라플라스 변환형태의 전달함수를 시간 영역에서 사용할 수 있는 전달함수로 변환하는 방법을 제시하고 다양한 예제를 통해 이 방법에 대한 타당성을 입증하였다.

Keywords

References

  1. Y.G. Kim, C.K. Park, S.W. Kim, K.H. Kim, J.S. Paik (2010) Analysis of the Frequency Weighting Curve for the Evaluation of Ride Comfort, Journal of the Korean Society for Railway, 13(6), pp. 552-558.
  2. Y.G. Kim, S. Choi, S.W. Kim, Y.M. Kim (2009) An experimental study on the ride comfort of the Korea high-speed train, EXPERIMENTAL TECHNIQUES, 33(6), pp30-37. https://doi.org/10.1111/j.1747-1567.2008.00419.x
  3. Y.G. Kim, H.B. Kwon, S.W. Kim, C.K. Park (2003), Correlation of evaluation methods of ride comfort for railway vehicles, Proc. Instn. Mech. Engrs(Part F), 217, pp. 73-88.
  4. Suzuki, H. (1998) Research Trends on Riding Comfort Evaluation in Japan, Proc. Instn. Mech. Engrs.(Part F), 212, pp. 61-72. https://doi.org/10.1243/0954409981530689
  5. Y.G. Kim, S.W. Kim, J.Y. Mok, S.S. Kim (2007) Estimation of ride comfort for Korean high speed train at high speed, Journal of the Korean Society for Railway, 10(2), pp. 146-152.
  6. International Organization for Standardization, ISO Code 10056 (2001).
  7. European Committee for Standardization (2009), EN Code 12299.
  8. Y.G. Kim, S.W. Kim, J.Y. Mok, K.H. Kim (2004) Analysis and evaluation of ride comfort for high speed train using statistical method according to UIC513R, Journal of the Korean Society for Railway, 7(4), pp. 332-338.
  9. Ogata, K. (1970) Modern Control Engineering, Prentice-Hall, Inc.
  10. NATIONAL INSTRUMENTS (2006) LabVIEW Control design toolkit user manual.

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