摘要
重载铁路及客货共线铁路运营条件下,轮轨磨耗问题尤为突出.为了有效减缓轮轨磨耗发展,以不同接触条件下轮轨廓形共形度最优为原则,设计目标函数及约束条件,建立钢轨廓形非线性优化数学模型,并基于序列二次规划法进行求解,提出60 kg/m钢轨廓形的优化方案;从轮轨接触几何关系、车辆-轨道系统动力作用、磨耗的角度对优化廓形的优化效果进行了对比分析.结果表明:1)所提出的60 kg/m钢轨优化廓形相对于原始廓形使目标函数值降低了50%,与LM车轮廓形具有更高的共形度水平;2)优化廓形的轮轨接触点分布更为均匀,在轮对横移量较小的条件下轮径差更小,在轮对横移较大的条件下轮径差更大;3)优化廓形对车辆运行安全性和平稳性无显著影响,可有效增大轮轨接触面积达11.24%,降低接触应力达20.42%,减缓轮轨磨耗发生发展速率.
Under the operation conditions of mixed passenger and freight railways as well as heavy haul railways,wheel/rail wear problem is particularly prominent.In order to slow down the growth of wheel/rail wear,the 60 kg/m rail profile is optimized.The objective function and constraint conditions are determined with the principle of optimizing the conformal degree of wheel-rail profiles under different contact conditions.Then,a nonlinear optimization model of the rail profile is established.The sequential quadratic programming method is adopted to solve this optimization model,and an optimization scheme of 60 kg/m rail profile is proposed.The effect of the optimized profile is compared and analyzed from the perspective of wheel-rail contact geometry,vehicle-track system dynamic interaction,and wear.The results show that:1)the proposed optimized profile of 60 kg/m rail reduces the objective function value by 50%,compared with the original profile,and has higher conformal level with the LM wheel profile.2)The distribution of wheel-rail contact points is more uniformly distributed on the optimized profile.The rolling radius difference is smaller when there is a small wheelset lateral displacement,and larger when there is a large wheelset lateral displacement.3)The optimized profile has no significant influence on vehicle safety and comfort,and can effectively increase the wheel-rail contact area by 11.24%,reduce the contact stress by 20.42%,and slow down the occurrence and growth rate of wheel-rail wear.
作者
王璞
王树国
赵振华
司道林
WANG Pu;WANG Shuguo;ZHAO Zhenhua;SI Daolin(Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)
出处
《西南交通大学学报》
EI
CSCD
北大核心
2022年第6期1233-1238,共6页
Journal of Southwest Jiaotong University
基金
国家自然科学基金(51808557,51878661)
中国铁道科学研究院集团有限公司院基金课题(2020YJ118)。
