| Timely and accurate grasp of track geometry is very important to ensure the safety of train running.The existing detection methods have some problems,such as high detection cost,low utilization rate of detection equipment,long detection cycle and skylight occupation.Suspension-mounting dynamic track inspection instrument(suspension-mounting track inspection instrument),can be easily loaded and unloaded on the operating train to achieve multi-frequency dynamic detection.This thesis designs its data acquisition system,studies the multi-sensor data acquisition method and measurement data processing method,studies the train mileage positioning method based on GNSS/INS information fusion,and verifies the reliability of the system and the accuracy of detection results.The main work of this thesis:(1)Analyze the detection principle of the suspension-mounting track inspection instrument,design the overall system structure and data acquisition system,and put forward the requirements of track geometry location solution and train mileage positioning measurement data.(2)Analyze the requirements of detection items and detection accuracy,investigate the advantages and disadvantages of existing measurement methods and sensor characteristics,and study the equipment selection of data acquisition hardware system.Combined with hardware electrical characteristics and installation requirements,integrated testing equipment in the convenient loading,unloading and operation of the vehicle on the equipment box.Considering the railway environmental impact and railway boundary requirements,a safe,stable and flexible equipment box installation scheme is designed,the finite element model of equipment box body is established,and the installation reliability inspection is studied.(3)In view of the problems of multiple sensors,difficult synchronous acquisition and high requirements for data spatio-temporal consistency of the suspension-mounting track inspection instrument,a synchronous controller is designed to realize multi-thread and multi-channel synchronous acquisition;Based on the multi-sensor data time synchronization alignment algorithm,the detection data can be aligned at the same sampling time point.Through the multi-sensor data acquisition test,the validity of the acquisition method and time alignment method and the consistency of the detection data in time are verified.The method of measuring data processing is studied to provide data basis for the calculation of track geometry and train mileage location.(4)A coordinate positioning method based on GNSS/INS information fusion is proposed,and it is verified by on-board tests that this method can realize the coordinate positioning under the state of GNSS signal losing lock.The mileage matching method is studied to realize the accurate location of train mileage and the high consistency of multi-source detection data in space-time and multi-dimension.(5)The suspension-mounting track inspection instrument is applied in Jungar-Shenchi Railway to collect data online and process data offline.The field verification results show that the data acquisition system of the mounted rail inspection instrument runs stably,the data is accurate and the algorithm is reliable. |
