基于惯性基准法的高速铁路纵断面线形平顺性研究
Study on profile line regularity based on the inertial reference method in high-speed railway

为研究线路竖曲线引起的长波高低不平顺超限问题，采用基于惯性基准法的虚拟轨检技术，建立高速列车—线路动力学仿真模型，通过车体加速度与车体-车轮相对位移反演得到虚拟不平顺，进而分析列车检测速度，竖曲线半径、长度、坡度差、夹坡段长度等竖曲线基本参数对虚拟不平顺的影响规律。分析结果表明：检测速度与竖曲线半径对虚拟长波不平顺影响较大，同时将计算结果与规范对比，建议对于设计时速为300 km/h的高速铁路，在设计允许的条件下，竖曲线长度和夹坡段长度设计值应大于500 m。
In order to research on the transfinite problem of long-wave irregularity caused by the vertical curve, this paper used the virtual track inspection technology based on inertial reference method. The high-speed train-line dynamics simulation model was established, and the virtual irregularity was obtained through the inversion of body acceleration and body-wheel relative displacement. The influence of parameters like train detection speed, radius and length of vertical curve, gradient difference and clip slope length on the virtual irregularity was investigated. The analysis results show that the detection speed and radius of vertical curve have big influence on virtual long wave irregularity. Through the comparison between the calculated results and specification, this paper suggests that for design speed of 300 km/h in high-speed railway, under design permission the design value of vertical curve length and clip slope length should be greater than 500 m