On the Wheelset Vibration due to the Stochastic Track Vertical Irregularities

Abstract:

The track vertical irregularities are the originator of the vertical vibrations in the wheelset. These vibrations are further conveyed to the suspended masses of the vehicle, thus generating and maintaining their vibrations. The study of the vibrations behavior of the wheelset plays an important role in the research dealing with the improvement of the vehicle dynamic performance, mainly at high velocities. This paper examines the vibrations behavior of the wheelset during running at speed of up to 200 km/h on a track with stochastic vertical irregularities, which are mathematically represented via the power spectral density. As underlain on numerical simulations, a series of basic features of the wheelset vertical vibrations will stand out, in correlation with the velocity, track quality and its damping. The observations herein prove that the maximum level of vibrations is visible at the frequency resonance of the wheelset on the track. Similarly, it is evident that the wheelset vibrations behavior increases during the running at high velocities on a track with weak damping and low quality.

• Periodical: Applied Mechanics and Materials (Volumes 809-810)
• Pages: 1037-1042
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.809-810.1037
• Online since: November 2015
• Authors: Madalina Dumitriu*, Ioan Sebeşan
• Keywords: Acceleration RMS, Damping Ratio, Power Spectral Density, Track Vertical Irregularities, Wheelset

References

[1] J. Pombo, J. Ambrósio, An alternative method to include track irregularities in railway vehicle dynamic analyses, Nonlinear Dynamics. 68 (1-2) (2012), 161-176.

DOI: 10.1007/s11071-011-0212-2

[2] EN 13848-1, Railway applications. Track geometry quality. Part 1. Characterization of track geometry, (2006).

DOI: 10.3403/30304246

[3] I. Sebeşan, Dynamic of the railway vehicles (in Romanian), MatrixRom Publishing, Bucharest, (2011).

[4] F. Cheli, R. Corradi, On rail vehicle vibrations induced by track unevenness: Analysis of the excitation mechanism, Journal of Sound and Vibration. (330) (2011) 3744–3765.

DOI: 10.1016/j.jsv.2011.02.025

[5] H. Tsunashima, Y. Naganuma, T. Kobayash, Track geometry estimation from car-body vibration, Vehicle System Dynamics. 52, supplement (2014) 207-219.

DOI: 10.1080/00423114.2014.889836

[6] S. Mohammadzadeh, M. Sangtarashha, H. Molatefi, A novel method to estimate derailment probability due to track geometric irregularities using reliability techniques and advanced simulation methods, Archive of Applied Mechanics. 81 (2011).

DOI: 10.1007/s00419-011-0506-3

[7] M. Dumitriu, The dynamic behaviour of the railway vehicles in crossing an isolated nivelment, Mechanical Journal Fiability and Durability. 1 (2014) 137 – 144.

[8] K. Karttumen, E, Kabo, A. Ekberg, The influence of track geometry irregularities on rolling contact fatigue, Wear. 314, 1-2 (2014) 78–86.

DOI: 10.1016/j.wear.2013.11.039

[9] Suarez, B., Felez, J., Lozano, J.A., Rodriguez, P., Influence of the track quality and of the properties of the wheel–rail rolling contact on vehicle dynamics, Vehicle System Dynamics. 51, 2 (2013) 301-320.

DOI: 10.1080/00423114.2012.725853

[10] I. Sebeşan, T. Mazilu, Vibrations of railway vehicles (in Romanian), MatrixRom Publishing, Bucharest, (2010).

[11] ORE B 176, Bogies with steered or steering wheelsets, Report No. 1: Specifications and preliminary studies, vol. 2, Specification for a bogie with improved curving characteristics, (1989).