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Study for Prediction of Contact Forces between Wheel and Rail Using Vibrational Transfer Function of the Scaled Squeal Noise Test Rig

축소 스킬소음 시험장치의 진동전달특성을 이용한 차륜/레일의 접촉력 예측에 관한 연구

  • Received : 2016.01.08
  • Accepted : 2016.02.04
  • Published : 2016.02.29

Abstract

Curved squeal noise may result when railway vehicles run on curved tracks. Contact between the wheels and the rails causes a stick-slip phenomenon, which generates squeal noise. In order to identify the mechanism of the squeal noise systematically, a scaled test rig has been fabricated. Knowledge of the contact forces between the wheels and the rail rollers is essential for investigating the squeal noise characteristics; however, it is difficult to measure there contact force. In this study, contact forces have been calculated indirectly according to the modal behavior of the subframe that supports the rail roller and the responses at specific positions of that subframe. In order to verify the estimated contact forces, the displacements at the contact points between the wheels and rail rollers have been calculated from the estimated forces; the resulting values have been compared with the measured displacement values. The SPL at the specific location has been calculated using the estimated contact forces and this also has been compared with the SPL, measured in a semi-anechoic chamber. The comparisons in displacements and SPLs show good correlation.

Keywords

Squeal noise;Contact force;Scaled test rig

References

  1. K.J. Kim, J.K. Park, B.S. Kim, J.C. Kim (2008) An experimental study of the curve squeal noise, Journal of the Korean Society for Railway, 11(2), pp. 176-181.
  2. S.S. Hsu, Z. Huang, S.D. Iwnicki, et al. (2007) Experimental and theoretical investigation of railway wheel squeal, Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 221(1), pp. 59-73. https://doi.org/10.1243/0954409JRRT85
  3. S. Papini, L. Pugi, A. Rindi, E. Meli (2013) An integrated approach for the optimization of wheel-rail contact force measurement systems, J. Mod. Transport, 21(2), pp. 95-102. https://doi.org/10.1007/s40534-013-0013-z
  4. M. Janssens, H.J. Van Vliet, P.P. Kooijman, F.G. de Beer (2000) Curve squeal of rail bound vehicles, Part 3: measurement techniques for wheel/rail contact velocities and forces at squeal noise frequencies, Proceedings of the Internoise 2000, Nice, France, pp. 27-30.

Acknowledgement

Supported by : 국토교통부, 한국연구재단