High-speed train rail transit failure safety monitoring and early warning system and signal processing method

Abstract

The invention discloses a train rail transit failure safety monitoring and early warning system and a signal processing method, which combines a vibration sensing system based on Sagnac interference with a phase-sensitive optical time-domain reflection vibration detection system based on coherent detection, and can control the steering Frames and rails for damage monitoring. The vibration of the bogie is monitored by the Sagnac interferometer, distributed optical fibers are deployed outside the rail, and the phase-sensitive optical time-domain reflection vibration detection system is used to monitor the vibration of the rail; short-time Fourier transform is used for time-frequency analysis, Establish a spectrum feature database for spectrum analysis, establish vibration feature vectors, use correlation vector products for vibration pattern recognition, and realize monitoring and early warning of train running status and track safety and health damage. It has the advantages of intrinsic safety, high signal measurement accuracy, direct restoration of signal phase information, high reliability, good real-time performance, long sensing distance, and early access to train rail transit hazard warning information, etc.

Description

technical field [0001] The invention relates to the field of distributed optical fiber sensing technology and the field of train track detection, in particular to a high-speed train track traffic failure safety monitoring and early warning system and a signal processing method. Background technique [0002] At present, many rail transit projects at home and abroad have different degrees of potential safety hazards. The health monitoring of trains and tracks plays a vital role in people's lives and property safety. With the increase of the running time of rail transit projects and the long-term operation of trains, due to the influence of environmental loads, fatigue effects, corrosion and material aging and other unfa Inevitably, damage accumulation and resistance attenuation will occur in the track structure. If it is not detected and treated in time, the damage will expand rapidly. Once the damage of the key structural components accumulates to a certain extent, it will ...

AI Technical Summary

Problems solved by technology

[0003] Traditional rail detection systems are expensive, mostly point-type electrical sensors, difficult to deploy and maintain, poor in real-time performance, and have relatively large limitations. Therefore, there is an urgent need for a fully distributed online monitoring of rails, and monitoring of the underlying support structure of trains and rail structures. A system for fail-safe health detection and early warning

At present, the structural safety monitoring on the train bogie is all electrical point sensors. If the structure is damaged, the information cannot be obtained immediately; and the most popular phase-sensitive optical time-domain reflectometry system based on direct detection is also limited by its principle. , can only achieve simple positioning of vibration, cannot directly restore the phase information of vibration, and the sensing distance is short, and the signal-to-noise ratio is poor

In addition, the existing layout schemes of phase-sensitive optical time-domain vibration sensing systems all use the existing communication optical cables laid in the railway system for signal acquisition. Low, which affects the sensitivity of the system to vibration detection, thus affecting the high-precision real-time health and safety detection of train bogie and track damage

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