高速铁路线路轨面坡度及竖曲线半径动态测量方法及应用研究

Study on Dynamic Measurement Method and Application of Rail Surface Slope and Vertical Curve Radius for High Speed Railways

为揭示高速铁路线路纵断面参数变化,以及和轨道不平顺、路基大桥沉降关系,针对国内尚无轨道纵断面参数动态检测装备,提出基于惯组的轨面坡度及竖曲线半径动态测量方法。首先,建立转向架构架及惯性坐标系,并以重力加速度、水平加速度极小相关性为基准对齐两坐标系;其次,基于转向架构架纵向加速度解算轨面坡度,并补偿列车俯仰运动及与轨道平面纵向倾角误差;然后,以坡度测量值为基础解算竖曲线半径;最后,以高速综合检测列车为平台,在国内某新建高速铁路实车试验。结果表明:坡度和竖曲线曲率重复性偏差绝对均值分别为0.07‰、0.71×10^(-3)rad/km,极差分别为0.22‰、0.005 rad/km。

To reveal the changes in railway profile parameters of high-speed railways and the relationship between railway profile,track irregularity and subsidence of subgrade and bridges,this paper proposed a dynamic measurement method for rail surface slope and vertical curve radius based on inertial measurement unit(IMU),in response to the lack of dynamic inspection equipment for parameters of railway profile in China.Firstly,the bogie frame coordinate system and IMU coordinate system were established,to align the two coordinate systems based on the minimal correlation between gravity acceleration and horizontal acceleration.Secondly,the rail surface slope was calculated by bogie frame longitudinal acceleration.The train pitch motion and longitudinal inclination error with the track plane were compensated.Then,the vertical curve radius was calculated based on the slope measurement value.Finally,experiments using a high-speed comprehensive inspection train were conducted on a newly built high-speed railway in China.The results show that the absolute mean deviations of slope and vertical curve curvature repeatability are 0.07‰and 0.71×10^(-3) rad/km,with respective range of 0.22‰and 0.005 rad/km.