Research on Design and Applications of Grinding Profiles of P75 Rail on Sharp Curve
Taking the P75 rail on R400 m curve of a heavy-haul railway as the research object,the description model of wheel-rail contacts and wheel diameter difference curve was established,and the representative measured wheel treads and rail profiles were selected.The rail profiles in the wheel-rail contact areas were optimized by the reverse solution method of the wheel diameter difference curves,and the grinding profile of the curves was designed according to the principle of minimizing the amounts of grinding.A simulation model of vehicle-track multi-body dynamics with real parameters was established in the multi-body dynamics software,and the dynamic indexes matching with meas-ured and designed profiles were compared and analyzed.The R400 m curve was ground with designed profiles,and the wheel-rail dynamics tests were carried out.The results show that,after optimiza-tion,the curves of wheel diameter difference tend to be smoother,the curve passing ability of vehicle is improveds,and the anti-derailment ability is maintained.The wheel-rail relationship is significantly improved matching with the designed profiles,and the cross-jumping and concentration problems at the wheel-rail contact points are alleviated.The lateral wheel-rail force was reduced by more than 20％,the derailment coefficient was reduced by more than 16％,the normal contact stress of the rail is reduced by more than 32％,and the wheel-rail creep force was reduced by more than 26％.After grinding with the designed profile,the lateral wheel-rail force is reduced by more than 34％,the de-railment coefficient is reduced by more than 34％,the vibration acceleration of the rail is reduced by more than 35％,the fatigue damage of the rail surface doesn't develop significantly in 3 months,and the service life of the rail is extended from 8 months to 13 months.The application effectiveness of rail profile design method on sharp curve in heavy-haul railway is verified through simulation analysis and field tests.
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