Abstract
Contact stress between wheel and rail is believed to cause damage to the rail. The relationship between the contact stress and the radius of the rail is initially based on the Hertz contact theory. By adjusting its radius, the rail profile is designed with an objective of reducing the maximal contact stress between wheel and rail. The rail profile of turnout is parameterized by defining several control cross sections along the switch. The experiment of dynamic vehicle-turnout interaction is also carried out to investigate the effect of the improved rail profile on the dynamical behavior of the vehicle. The method is then verified through examples using rail profile with a switch width of 20 mm and LM worn-type tread at the CN60-350-1:12 turnout. The results show that the designed rail has a higher matching degree with the wheel profile. It can reduce the contact stress, improve the wheel-rail contact state, and prolong the service life of the rail without deteriorating the dynamic performance of the vehicle passing through the turnout.
Highlights
Turnouts are mechanical installations enabling railway trains to be guided from one track to another, which makes them become integral components of the railway infrastructure
A reasonable improvement of the wheel-rail contact conditions is able to reduce wheel-rail contact stress and prolong the rail service life. us, Shevtsov et al [4] and Shen and Zhong [5] proposed the optimization design of the wheel tread surface based on the rolling radius difference function. e obtained wheel tread surface proved to be effective in reducing the wheel and rail wear without deteriorating the dynamic performance
A new direct numerical method is proposed to optimize the rail profile in the switch panel, minimizing the wheel-rail contact normal stress as the design objective. e relationship between the radius of rail profile and contact stress was initially established based on Hertz theory. en the rail profile is designed by directly adjusting the radius of the curve
Summary
Turnouts are mechanical installations enabling railway trains to be guided from one track to another, which makes them become integral components of the railway infrastructure. Rail grinding technology is an integral part of railway maintenance, which can remove the rail surface defects with accumulated rolling contact fatigue, relieve the adverse wheel and rail wear, reduce the wheel-rail contact stress, and repair rail profile to prolong the service life of the rail [2, 3]. E geometry characteristic of the wheel and rail profile is closely related to the vehicle operational safety, dynamic performance, and the service life of wheel and rail. E obtained wheel tread surface proved to be effective in reducing the wheel and rail wear without deteriorating the dynamic performance. By optimizing the rail profile of the curved outer track, the maximum wheel-rail contact stress was reduced by about 50%. It was reported that the contact stress between the wheel and rail had a large impact on the
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