简单链形悬挂接触网整体吊弦瞬态动力学性能研究

以我国京津线高速铁路接触网整体吊弦为研究对象,建立弓网系统耦合模型。建模时将吊弦等效为仅可承受拉力的非线性弹簧,并利用罚函数法实现弓网系统的耦合。对建立的弓网耦合模型进行验证后,研究了弓网相互作用下整体吊弦的瞬态动力学响应。研究结果表明:弓网相对滑动速度为300 km/h及350 km/h时,同一跨内不同吊弦的动态接触力振动主频相同,均为7.8 Hz;弓网相对滑动速度300 km/h下,受电弓滑过后不同吊弦上下节点横向振动振幅很小,均小于3 mm;同一吊弦上下节点垂向振动相位基本一致,且不同吊弦上下节点垂向振动的主频均为1.42 Hz;弓网相对滑动速度250~350 km/h内,同一跨内3#吊弦的松弛时间最长。

A study on the transient dynamic performance of integral dropper of simple chain suspension catenary

The integral dropper of a catenary system of Beijing—Tianjin high-speed railway was taken as the research object,and a coupling model of the pantograph-catenary system was established using a finite element method.The integral dropper was equivalent to a nonlinear spring which can only bear tension,and the coupling of the pantograph-catenary system was realized by a penalty function method.After verified the simulation model,the transient dynamic performance of integral dropper was studied.Results show that:while the relative speed between pantograph and catenary is 300 km/h or 350 km/h,the dominant frequency of dynamic force of different integral dropper in the same span is the same,and the dominant frequency is 7.8 Hz;While the relative speed is 300 km/h,the transverse vibration amplitude of different dropper′s upper and lower node is very small,which is less than 3 mm.Both the upper node and the lower node in a same dropper have the same vertical vibration phase,and the vibration dominant frequency of different dropper′s upper node or lower node is 1.42 Hz;while the relative speed range from 250-350 km/h,3#dropper has a longest relaxation time compared with other droppers in a same spin.