Automation Design And Realization For The Rolling Stock Static Gauge Measurement System

In recent years, a number of high-speed passenger dedicated line, such asWuhan-Guangzhou, Beijing-Shanghai, Hefei-Wuhan, has been built in China, and asubstantial increase in train speed has been realized, so rail transport security hasbecome an important topic of social development. The rolling stock static gaugemeasurement directly affect the safety of railway transportation, thus, the research onthe rolling stock static gauge measurement technology has a high degree of social andeconomic benefits. At present, the domestic rolling stock inspection station mainlyapplies a sentinel-contact measurement method, which has problems of lowmeasurement efficiency, low degree of automation, low measurement accuracy. Inview of the development status of the domestic rolling stock gauge measurementtechnology, a rolling stock static gauge measurement scheme based on laser scanningis constructed on the basis of the update of the existing contactless static gaugeregulation.The entire locomotive-section of rolling stock is measured with laser rangingsensors arranged around the body of the vehicle and moved under the control of motordrive. Before the scanning measurement, the first step is to establish the railcoordinate system with the laser tracker and complete the calibration of the originlocation of the distance measuring sensor, the dimensional movement direction andthe light direction. And then using the vector superposition method to solve thethree-dimensional coordinate values of the measured points, and finally, using asimplified two-dimensional super-sector judgment method to complete super-sectorjudgment.The hardware scheme and PLC program are designed to meet the needs forautomation control of the gauge measurement system. After the analysis of rollingstock gauge measurement needs, the overall framework of the system software isgiven, and then the serial communication module between the ranging sensor, PLCand PC, the running monitoring module, the measurement control module, the dataprocessing module and the data storage module are separately designed. And finally,the serial communication module has been tested. After finishing the on-field layout and equipment of ranging sensors, cabinet aswell as on-site wiring, the measurement accuracy experiment for the system,compared with the measurement accuracy of laser tracker, is designed. Experimentalresults show that: the system measurement accuracy can reach±0.5mm, basicallymeeting the needs of the static gauge measuring.