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Abstract

The article investigates the influence of the carbody vertical flexibility on the ride comfort of the railway vehicles. The ride comfort is evaluated via the comfort index calculated in three reference points of the carbody. The results of the numerical simulations bring attention to the importance of the carbody symmetrical vertical bending upon the dynamic response of the vehicle, mainly at high velocities. Another conclusion is that the ride comfort can be significantly affected as a function of the symmetrical bending frequency of the carbody. Similarly, there are improvement possibilities for the ride comfort when the best selection of the stiffness in the longitudinal traction system between the carbody and bogie and the vertical suspension damping is made.

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Bibliography

[1] M. Dumitriu and I. Sebeşan. The quality of railway vehicles. MatrixRom, Bucharest, 2016. (in Romanian).
[2] J. Zhou, R. Goodall, L. Ren, and H. Zhang. Influences of car body vertical flexibility on ride quality of passenger railway vehicles. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 223(5):461–471, 2009. doi: 10.1243/09544097JRRT272.
[3] G. Diana, F. Cheli, A. Collina, R. Corradi, and S. Melzi. The development of a numerical model for railway vehicles comfort assessment through comparison with experimental measurements. Vehicle System Dynamics, 38(3):165–183, 2002. doi: 10.1076/vesd.38.3.165.8287.
[4] F. Cheli and R. Corradi. On rail vehicle vibrations induced by track unevenness: Analysis of the excitation mechanism. Journal of Sound and Vibration, 330(15):3744–3765, 2011. doi: 10.1016/j.jsv.2011.02.025.
[5] D. Gong, J. Zhou, and W. Sun. On the resonant vibration of a flexible railway car body and its suppression with a dynamic vibration absorber. Journal of Vibration and Control, 19(5):649–657, 2013. doi: 10.1177/1077546312437435.
[6] M. Dumitriu. Analysis of the dynamic response in the railway vehicles to the track vertical irregularities. Part II: The numerical analysis. Journal of Engineering Science and Technology Review, 8(4):32–39, 2015.
[7] P. Carlbom. Carbody and Passengers in Rail Vehicle Dynamics. Ph.D. Thesis, KTH, Vehicle Engineering, Stockholm, Sweden, 2000. NR 20140805.
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[9] M. Dumitriu. On the critical points of vertical vibration in a railway vehicle. Archive of Mechanical Engineering, 61(4):609–625, 2014. doi: 10.2478/meceng-2014-0035.
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[13] H. Ye, J. Zeng, Q. Wang, and X. Han. Study on carbody flexible vibration considering layout of underneath equipment and doors. In Proceedings of 4th International Conference on Sensors, Measurement and Intelligent Materials (ICSMIM 2015), pages 1177–1183, Shenzhen, China, 27-28 Dec. 2015. Atlanitis Press, 2016. doi : 10.2991/icsmim-15.2016.217.
[14] K. Wang, H. Xia, M. Xu, and W. Guo. Dynamic analysis of train-bridge interaction system with flexible car-body. Journal of Mechanical Science and Technology, 29(9):3571–3580, 2015. doi: 10.1007/s12206-015-0801-y.
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Authors and Affiliations

Mădălina Dumitriu
1
Cătălin Cruceanu
1

  1. Department of Railway Vehicles, University Politehnica of Bucharest, Romania
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Abstract

This paper evaluates the level of the vertical vibrations in a railway vehicle carbody generated by the track irregularities and examines the position of the critical point from the comfort perspective. The issue is reviewed on the basis of both a „rigid carbody” model and a „flexible carbody” model, which considers the first two carbody bending modes. The model errors are calculated as a function of the speed behaviour, and the results prove that the comfort performance of a railway vehicle evaluated on the „rigid carbody” model basis are overestimated compared to the ones derived from the implementation of the „flexible carbody” model, mainly at the centre of the carbody. Similarly, a correct estimation of the critical point position in the level of vibrations requires the modelling of the structural vibrations of the vehicle carbody.

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Authors and Affiliations

Mădălina Dumitriu
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Abstract

The equipment mounted on the carbody chassis of the railway vehicles is a critical component of the vehicle in terms of ride comfort. The reason for that is their large mass, able to visibly influence the vibrations mode of the carbody. The paper examines the influence of the equipment upon the mode of vertical vibrations of the carbody in the high-speed vehicles, reached on the basis of the frequency response functions of the acceleration in three carbody reference points – at the centre and above the bogies. These functions are derived from the numerical simulations developed on a rigid-flexible coupled model, with seven degrees of freedom. As a rule, the results herein prove the influence of the equipment mounting mode (rigid or elastic), along with the speed regime, upon the level of vibrations in the carbody reference points, at the resonance frequency of the symmetrical bending mode. Similarly, it is also demonstrated how the equipment mass and the damping degree of the suspension system affect the level of the vibrations in the carbody.

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Authors and Affiliations

Mădălina Dumitriu

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