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A Study on the Effect of Changes in Chevron Rubber Characteristics on the Vibrational Ride Comfort Level of a Subway Vehicle

도시철도차량 세브론 고무 특성 변화가 진동승차감 레벨에 미치는 영향 연구

  • Park, Nam Cheol (Department of Rolling Stock System, Seoul National University of Science & Technology) ;
  • Koo, Jeong Seo (Department of Rolling Stock System, Seoul National University of Science & Technology)
  • 박남철 (서울과학기술대학교 철도차량시스템공학과) ;
  • 구정서 (서울과학기술대학교 철도차량시스템공학과)
  • Received : 2015.09.12
  • Accepted : 2015.12.01
  • Published : 2016.04.30

Abstract

The suspension system of a subway vehicle is composed of $1^{st}$ and $2^{nd}$ springs. The suspension system is the most important parameter in determining the vibration ride comfort. If the $1^{st}$ suspension spring is designed as a spring with strong stiffness to improve the running stability at high speed, it causes vehicle vibrations. In this paper, by testing and analyzing changes of the characteristics of Chevron springs, which have been the primary suspension springs used for about 20 years, we study how changing the characteristics affects vehicle acceleration and ride comfort. The lateral and longitudinal vibrational ride comfort index levels were lower than the vertical ones. Therefore, as increasing the stiffness of Chevron springs has the greatest effect on the vertical vibrational ride comfort index level, a countermeasure for vertical vibration reduction is needed when the stiffness increases owing to aging. Finally, maintenance guidelines, including the replacement time for the Chevron rubber, were proposed based on these findings.

Acknowledgement

Supported by : 국토교통부

References

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Cited by

  1. Approximate Response of a Non-linear Vibration Isolation System Using the Harmonic Balance Method vol.17, pp.6, 2018, https://doi.org/10.14775/ksmpe.2018.17.6.124