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建立了基于Timoshenko梁模型的车辆/轨道耦合动力学模型,分析轨下支承失效对直线轨道动态响应的影响.钢轨被视为连续弹性离散点支承上的无限长Timoshenko梁,通过假设轨道系统刚度沿纵向分布发生突变来模拟轨下支承失效状态.推导了考虑钢轨横向、垂向和扭转运动的轮轨滚动接触蠕滑率计算公式.利用Hertz法向接触理论和沈氏蠕滑理论计算轮轨法向力及轮轨滚动接触蠕滑力.采用移动轨下支承模型的车辆/轨道耦合系统激振模式,考虑轨枕离散支承对系统动力响应的影响.通过新型显式积分法求解车辆/轨道耦合动力学系统运动方程,由数值分析计算得到不同轨下支承失效状态下直线轨道的动态响应.结果表明,轨下支承失效对直线轨道变形及加速度有显著的影响,随着失效轨下支承个数的增加,轮轨相互作用力和轨道部件的位移、加速度将会急剧增大,将加速失效区段线路状况的恶化.
The vehicle / track coupling dynamics model based on the Timoshenko beam model is established to analyze the influence of the under-rail bearing failure on the dynamic response of the linear orbit. The rail is regarded as an infinite Timoshenko beam with continuous elastic discrete point support. The longitudinal distribution of the rail was simulated to simulate the failure condition of the rail under rail.The formula to calculate the rolling contact creep rate considering the transverse, vertical and torsional movement of the rail was deduced.The wheel-rail method was calculated by the Hertz normal contact theory and the creep-slip theory Force and wheel-rail contact rolling force. The vibration mode of the vehicle / track coupling system with moving-rail support model is taken into account and the influence of discrete sleepers on the dynamic response of the system is considered. The new explicit integration method is used to solve the vehicle / track coupling dynamics The dynamic response of the linear orbit under different track failure conditions is calculated by numerical analysis.The results show that the failure of the under-track support has a significant impact on the deformation and acceleration of the linear track, and with the number of support under the failure track Increasing the wheel-rail interaction force and the displacement of the rail components, the acceleration will increase sharply, accelerating the failure The deterioration of the situation of the line segment.