接触网几何参数高速动态视觉测量方法研究

Study on high-speed and dynamic vision measurement approach for overhead catenary system geometric parameter inspection

接触网几何参数对于电气化铁路至关重要,其优劣不仅影响弓网受流质量,还关系列车行驶安全。既有接触网几何参数动态检测装置多存在测量频率低、检测速度无法继续提高的现实。随着列车提速和线路日益繁忙,对接触网几何参数动态检测速度要求相应提高。如何在高速动态条件下,准确获取接触网几何参数,成为接触网检测面临的重要问题。针对接触网几何参数高速动态测量实际需要,设计了一种双线阵摄像机与线结构光源相结合的视觉传感器,基于双目线阵主动摄像测量技术,对接触网几何参数进行高速动态测量。系统介绍了2组线阵摄像机及结构光源进行接触网几何参数测量原理,详细推导了双目线阵主动摄像测量计算公式,建立了接触网几何参数非线性视觉测量模型。基于此,研制接触网几何参数高速动态检测装置,并进行动态测量实验。实验结果表明该测量方法切实可行,为该项技术应用于高速铁路接触网几何参数高速动态检测提供试验基础。

Geometric parameters of overhead catenary system （OCS）are critical to the electrical railways.The space positions of the OCS not only determine the current collecting quality of the power equipment,but also influence the driving train safety.With the rail-way speed continuously improving and railway lines increasingly busy,traditional OCS geometric parameter measurement systems face a realistic challenge：most of the traditional OCS geometric parameter dynamic measurement systems have the defect of low acquisition speed,which limits their application in high-speed dynamic measurements.Therefore,how to obtain accurate OCS geometric parameters with high-speed is the key issue for the OCS inspection in the future.In order to improve the dynamic inspection speed of OCS geometric parameter measurement systems,an approach based on two line-scan cameras and one structured-light source is presented.The measure-ment principle of the geometric parameters is systematically introduced.Then,the detailed computation formula is deduced and the non-linear vision model is constructed.At last,the OCS geometric parameter dynamic inspection setup was developed.The dynamic experi-ment results show the effectiveness of the measurement setup,which lays a foundation for its application in high-speed railway OCS geo-metric parameter dynamic measurement.