Research On The Reliability Of High-speed Railway Natural Disaster And Foreign Object Invasion Monitoring System

With the speed-up of high-speed trains, trains are more and more sensitive to natural disasters and accidents. In order to ensure the safety and operation of trains, to avoid or reduce the impact caused by the natural disasters and emergencies, high-speed railway natural disaster and foreign object invasion monitoring system(referred to as disaster monitoring system) were synchronously built with the construction of high speed railway. In protecting the safety and high-speed of trains, disaster monitoring system exposed many problems. How to improve the system reliability, reduce the influence to the operation and the system maintenance work, becomes a problem that needs to be solved urgently at present.Based on the application investigation of disaster monitoring system, this thesis analyzed the existing problems of the system firstly. Faults of the system were summarized. After that, detection methods were put forward for main faults. Finally, taking foreign object invasion monitoring system as an example, suggestions and measures were put forward to improve the reliability of the system. Three main work of this thesis are as follows.(1) Application investigation and analysis of the disaster monitoring system. Existing problems of the system were exposed by the investigation, and faults were analyzed. Statistical analysis were made, and the common faults of the system were summed up. The conclusion is that meteorological sensor, monitoring host, foreign object double grid mesh, UPS power supply, signal lightning protection, network connection is the equipment of system often fails. While, equipment faults were different in different Bureaus and different high-speed lines. Meanwhile, with the constant improvement of disaster monitoring system, the occurrence number of system faults were reducing.(2) Faults detection technologies were proposed for the main faults of disaster monitoring system. Meteorological sensors detection method was proposed based on wavelet analysis. Foreign object double grid mesh fault detection method were based on the low voltage impulse method. On-line monitoring systems for detecting the UPS power fault were discussed. Finally, distribution box fault detection technologies were proposed based on voltage and current monitoring method.(3) Suggestions and measures for improving the reliability of the disaster monitoring system were proposed. Taking rainfall monitoring system as an example, suggestions were put forward from system maintenance cycle and the judgment of abnormal monitoring value. In order to keep the system reliability is over 90%, the maintenance cycle is proposed for 8871 hours. In order to solve false alarms of the rainfall system, the minute cumulative rainfall volume needs to be add in to the alert evaluation rules.(4) Reliability test of the rainfall monitoring equipment. During the test, data integrity of the non-contact type rain gauges is high. The values given by non-contact gauges in different rainfall intensities are high consistency and meet the maximum permissible error requirements of the relevant provisions. However, when rainfall density is over 60 mm per hour, values given by non-contact type rain gauges and tipping bucket rain gauge are bigger and bigger with the increase of rainfall intensity. Since the tipping bucket rain gauge and artificial simulated rainfall hall are the same, the difference may be caused by the insufficient height of artificial simulation rainfall hall, which caused rain drops did not reach their terminal velocity when they arrived at the ground. The test environment needs to be further improved.