弓网相互作用时受电弓关键部件动载荷研究

Dynamic Load Research of Key Components of Pantograph in Pantograph-catenary Interaction

为研究弓网相互作用时受电弓各部件承受的主要载荷,基于相对坐标方法建立受电弓多刚体动力学方程,采用模态叠加原理建立接触网动力学方程,应用赫兹接触理论构建弓网接触模型,通过四阶龙格库塔法和中心差分法求解运动微分方程。分析速度影响下弓网接触力、弓头悬挂力及受电弓各部件的运动状态,在频域和时域上分析受电弓各部件载荷动态特性。结果表明:接触压力低阶部分透过弓头及其悬挂系统传递至上臂杆,但其高阶部分被弓头弹性悬挂系统吸振而耗散;上臂杆弯矩、拉杆轴向力和下臂杆轴向力的主频基本相同,且与弓头悬挂力频率成分保持一致;相比下臂杆轴向力,其弯矩载荷含有更多的频率成分。

In order to analyze the major load on the main components of pantograph during pantograph-catenary interaction,the relative coordinate method was applied to establish multi rigid body dynamic equation of pantograph.The modal superposition principle was used to establish the dynamic equation of catenary and Hertz contact theory was used to build the pantograph-catenary contact model.Fourth-order Runge Kutta method and central difference method were used to solve the motion differential equations.The pantograph-catenary contact force,suspension force of pantograph head and motion states of pantograph components were figured out at different speeds.The dynamic load characteristics of pantograph components in time domain and frequency domain were analyzed.The results show that the low order frequency part of the contact force will pass directly through the pantograph head and its suspension system to the upper frame,while the high order frequency part will be absorbed and dissipated by the elastic suspension system of pantograph head.The bending moment of the upper arm,axial force of the link and lower arm have almost the same frequency component,keeping the same frequency components with the suspension force of the pantograph head.Compared with the axial force of the lower arm,the bending moment load of the lower arm has more frequency components.