In order to evaluate the impact of sudden changes in track stiffness caused by the transition between new and old pads during the replacement process of elastic pads for high speed railway fasteners on train running status,a vehicle-track coupling dynamics simulation model was established,the impact of sudden stiffness changes in straight and curved sections,as well as at rail joints,on the smoothness of train running was analyzed,the three-level transition mode of pad replacement interval length and stiffness was studied,and a scheme for replacing elastic pads with fasteners was proposed.The results show that replacing elastic pads for fasteners in straight and curved sections is beneficial for reducing wheel-rail dynamic effects.Only after leaving the pad replacement area,there is an unstable driving zone with a length of about 10 m,which will cause an increase in some train dynamic indicators,but the increase is relatively small.The presence of steel rail welding joints in unstable driving areas can cause a sharp increase in wheel-rail dynamic effects.At the end of the pad replacement area,a transition zone with a static stiffness of 45 kN/mm and a length of 25 m is used to reduce the wheel-rail dynamic effect and improve the smoothness of train operation.
关键词
高速铁路/垫板更换/数值模拟/刚度突变/轮轨动力响应/运行平稳性/刚度三级过渡
Key words
high speed railway/pad replacement/numerical simulation/stiffness mutation/wheel-rail dynamic response/running smoothness/three-level transition of stiffness
维普
万方数据