道岔缓和曲线尖轨切削方式选型的动力学研究

以轮轨系统动力学理论为基础,建立车辆-转辙器动力耦合模型,计算并分析42号缓圆缓型道岔前缓和曲线尖轨选取五种不同切削方式时,轮轨系统动力指标及钢轨磨耗变化情况.结果表明:利用动力学方法评价各种缓和曲线尖轨切削方式的优劣性,能够使尖轨选型更加可靠;缓圆缓型道岔中选用半切线型缓和曲线尖轨,可获得较好的行车性能、转辙器结构稳定性和钢轨磨耗性能,部分设计条件下也可依照具体要求采用切线型尖轨;对运营中道岔转辙器结构动力性能的分析,需考虑几何不平顺等因素的共同作用.

Dynamic analysis of cutting mode selection for switch blade with transition curve

A vehicle-switch dynamic coupling model was established based on the wheel-rail system dynamic theory; taken No.42 turnout with easement-circular-easement curve for example, five cutting modes of switch blade with transition curve were respectively considered into the analysis of wheel/rail dynamic responses and rail wearing. Results show that it is reasonable to apply the dynamic method to evaluate various cutting modes of switch blade, which makes the cutting mode selection more reliable; the turnout with easement-circular-easement curve can get good train-running performance, switch stability and rail wear performance when the semi-tangent switch blade with transition curve is selected, and sometimes tangent switch blade is applied when some special design conditions are considered; for turnouts in operation, geometry irregularity and other factors need to be considered into the calculation of turnout switch dynamic responses.