基于雷达测速曲线的车辆减速器单位制动能高自动计算方法

Automatic Calculation Method for Energy Taken-out per Unit Length of Car Retarder Based on Radar Velocity Curve

基于雷达测速曲线和车辆减速器单位制动能高实际测算公式,提出车辆减速器单位制动能高自动计算方法。采用中值滤波法对雷达测速曲线进行滤波处理,通过速度积分与数据分析相结合的方法准确定位减速器的作用区段;基于随机抽样一致性的带噪声数据建模,计算减速器作用区段的加速度;将加速度带入减速器单位制动能高实测计算公式实现减速器单位制动能高的自动计算;对一段时间内的减速器单位制动能高进行统计分析,按时间顺序以散点图的方式展示。以实际调车场的作业为例,采用该计算方法进行计算,并将计算结果与手工计算结果进行对比。结果表明:采用该计算方法既可以得到减速器单位制动能高的实时值,也可以得到其在一定时间段的变化规律。该结果可用于指导减速器的养护维修,从而提高车组溜放速度的控制精度。

An automatic calculation method for car retarder＇s energy taken-out per unit length based on radar velocity curve and actual measurement calculation formula is put forward. Median filtering method is adopted to filter radar velocity curve. The action section of car retarder in radar velocity curve is then located accurately by means of combining data analysis and velocity integration. The acceleration of the selected action section is calculated through modelling with noise data based on random sample consensus （RANSAC）, which is used to calculate automatically the energy taken-out per unit length of car retarder. The statistical analysis for the energy taken-out per unit length of car retarder during a period of time is performed and the result is shown by scatter plot in chronological order. Automatic computing outputs on real hump data are compared to manual calculation results, which shows that with this method, both the real time value of car retarder＇s energy taken-out per unit length and its trend in a certain period of time can be obtained. The result can serve for guiding retarder maintenance and promoting the speed control preci- sion for rolling cars.