Journal
VEHICLE SYSTEM DYNAMICS
Volume 60, Issue 6, Pages 2167-2189Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00423114.2021.1902541
Keywords
Railway dynamics; heavy-haul locomotive; wheel-rail contact; non-Hertzian contact; friction condition
Categories
Funding
- National Natural Science Foundation of China [52072317, 51825504, 51735012]
- State Key Laboratory of Traction Power [2021TPL-T08]
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This study investigates the wheel/rail dynamic interactions of heavy-haul locomotives subjected to traction loads and different contact conditions using a non-Hertzian contact method. The results show that traction effort and friction conditions significantly influence the contact forces, distributions of contact stress, and wear index in the wheel/rail contact patch.
Wheel/rail dynamic interactions of heavy-haul locomotives are highly nonlinear and complicated due to large traction/braking loads, frequent anti-slip control and complex wheel/rail interface environment. The wheel/rail dynamic interactions, as well as the interface wear, have been broadly studied by means of Hertzian contact analysis, but the wheel/rail contact is essentially a non-Hertzian contact matter. This paper presents an investigation of wheel/rail dynamic interaction characteristics of a heavy-haul locomotive subjected to traction loads and dry/wet/greasy contact conditions by using a non-Hertzian contact method. For this purpose, a comprehensive dynamics model for heavy-haul train-track coupled system is established. A non-Hertzian normal contact algorithm and the corresponding creep algorithm are employed to solve wheel/rail normal and tangential contact forces, respectively. The locomotive wheel/rail dynamic interactions under different contact conditions and traction efforts are discussed. The simulation results indicate that traction effort and friction conditions have a significant influence on the contact forces, distributions of contact stress, and adhesion-slip region in the wheel/rail contact patch. The adhesion-slip distributions were found to reach full-slip under the lowest-adhesion conditions, and the wear index was found to be much greater than that under dry condition.
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