基于定位装置参数等效的接触网二维力学模型

接触网既是供电的线路,又是受电弓的滑道,其结构为三维柔性索网,当受电弓通过时,支持点和张力补偿点不存在瞬时大位移,其动态行为可以忽略,定位点由于存在非线性铰接,定位点处的动态行为不能被忽略。为等效定位点的动态行为,通过静力学分析,简化三维力学模型,将定位装置的三维非线性铰接等效为二维线性弹簧,并推导弹簧的等效刚度值计算公式,得到接触网二维力学模型。最后通过仿真实例,验证接触网二维力学模型的静态和动态效果与接触网三维模型完全吻合,并确认定位装置等效刚度的计算方法。

Two-dimensional Mechanical Model of the Catenary Based on Equivalent Steady Device Parameters

The catenary serves for power supply and as a path for pantograph sliding,When a pantograph is passing by,there is no large instant displacement at the support points and the tension compensation points,therefore the dynamic behavior can be ignored on account of its three-dimensional soft wire structure. However,the dynamic behavior at the fixing points cannot be ignored because of the non-linear hinge. To obtain the equivalent dynamic behavior of the fixing points,the three-dimensional mechanical model is simplified by static analysis,which converts the three-dimensional nonlinear hinge into a twodimensional linear spring,and then the formula to calculate equivalent stiffness of the spring is derived and the two-dimensional mechanical model of the catenary is established. Finally,the static and dynamic effects of the two-dimensional mechanical model of the catenary are proved with simulation in full agreement with that of the three-dimensional mechanical model of the catenary,and the method to calculate the equivalent stiffness of the steady device is confirmed.