T型铁路轨道检查仪轨距测量固有误差及其补偿(上)

Inherent Error and Compensation of T-shaped Inspecting Instrument for Railway Track in Gauge Measurement(Part 1 of 2)

T型铁路轨道检查仪为T形小车结构,在测量曲线轨距时,由于测量原理存在缺陷,测得的轨距中会引入固有误差(D值误差),导致“假轨距”问题。在分析轨距测量原理和D值误差,以及D值误差对轨距测量准确度影响的基础上,讨论短纵梁、线形参数补偿、增加轨距辅助测头等处理“假轨距”问题的常见方法,提出惯性轨迹补偿方法,并在试验线路上验证轨距补偿效果。结果表明,采用惯性轨迹补偿方法补偿后,T型铁路轨道检查仪测得的轨距更接近实际轨距,且满足TB/T3147—2020《铁路轨道检查仪》要求,重复性和一致性优于轨距辅助测头补偿方法。基于2种补偿方法效果的分析,提出优化铁路轨道检查仪标准的相关建议。

The T-shaped inspecting instrument for railway track is a T-shaped trolley structure.When measuring the gauge on curves,due to deffects in the measurement principle,inherent errors(D-value error)will be introduced into the measured gauge,leading to the problem of"false gauge".On the basis of analyzing the principle of gauge measurement and D-value error,as well as the impact of D-value error on the accuracy of gauge measurement,the pa-per discusses common methods for dealing with"false gauge"problems,such as short longitudinal beams,linear pa-rameter compensation,and adding an assisted gauge probe,proposes an inertial trajectory compensation method and verifies the effect of gauge compensation on experimental lines.The results show that after using the inertia trajectory compensation,the gauge measured by the T-shaped inspecting instrument for railway track is closer to the actual gauge and meets the requirements of TB/T 3147—2020 Inspecting instruments for railway track.The repeatability and consistency are better than those of the assisted gauge probe compensation method.Based on the analysis of the effec-tiveness of two compensation methods,relevant suggestions for optimizing the standards of inspecting equipment for railway track are proposed.