中国机械工程2024，Vol.35Issue(6)：1112-1119,8.DOI:10.3969/j.issn.1004-132X.2024.06.017
小半径曲线上P75钢轨打磨廓形设计及应用研究
Research on Design and Applications of Grinding Profiles of P75 Rail on Sharp Curve
摘要
Abstract
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.关键词
轮径差曲线/钢轨廓形设计/钢轨打磨/轮轨力/钢轨振动加速度/钢轨磨耗Key words
wheel diameter difference curve/rail profile design/rail grinding/wheel-rail force/rail vibration acceleration/rail wear分类
交通工程引用本文复制引用
刘永乾,任尊松,侯银庆,吴潇,王军平..小半径曲线上P75钢轨打磨廓形设计及应用研究[J].中国机械工程,2024,35(6):1112-1119,8.基金项目
国家自然科学基金重点项目(U2368215) （U2368215）
中国国家铁路集团有限公司科技研究开发项目(N2022G011) （N2022G011）
