门架式转向架迫导向机构曲线通过动力学性能

为了预测安装了迫导向机构的100%ULF(tra low floor)低地板车辆的曲线通过性能,分析了门架式转向架的迫导向机构组成及其导向原理,推导了其导向参数的理论公式,建立了动力学模型,并通过计算机仿真详细分析了迫导向机构对车辆曲线通过性能的影响,对比分析了加装前后车辆的4个曲线通过性能指标.研究结果表明:加装迫导向机构后车辆的一、二位轮组轮轨横向力变化较小,脱轨系数也无明显变化,轮组冲角可以减少0.5左右,约减少60%,外轮磨耗指数减少量均超过了10 kN();在对加装迫导向机构后的车辆在不同曲线半径下的通过性能进行预测,当曲线半径大于100 m时,曲线通过性能较好,当曲线半径小于10 m时,转向架的各项曲线通过性能指标响应变得较为敏感,总体车辆在迫导向机构的作用下具有较好的小半径曲线通过性能. 

Curve-Passing Dynamic Performance of Portal Bogie with Forced Steering Mechanism

In order to predict the curve-passing dynamic performance of ultra-low-floor (ULF) trams, the configuration of the forced steering mechanism and its working principles were analyzed, theoretical formulas of related steering parameters were derived, and a curve-passing dynamic model was built. By using computer simulation, the influences of the forced steering mechanism on vehicles' curve-passing dynamic performance were assessed, and a comparison on four curve-passing dynamic indexes was made between vehicles with and without forced steering mechanism. As a result, the wheel-rail lateral force and the derailment coefficient in the two cases showed no difference, but the angle of attack of the vehicle with the forced steering mechanism was reduced by nearly 60%(about 0.5), and the wheel-rail wear coefficient of wheel pairs in positions No. 1 and No.2 was reduced more than 10 kN(). In addition, the curve-passing performance of vehicles were predicted in different curve radiuses. It was found that when the curve radius was over 100 m, the vehicles showed good curv-passing dynamic performance; and when the curve radius was less than 100 m, the response of curve-passing dynamic indexes became sensitive. On the whole the vehicles with a forced steering mechanism have good small radius curve-passing performance.