High-speed rail health monitoring system based on ultrasonic guide wave and wireless network

Abstract

The invention discloses a high-speed rail health monitoring system based on ultrasonic guide wave and a wireless network. A vehicle-mounted center processing and decision module sends a detection instruction to an ultrasonic guide wave exciting module through a wireless network transmission module; the ultrasonic guide wave exciting module generates excitation wave; the ultrasonic guide wave is generated in a rail and transmitted to an ultrasonic guide wave signal receiving and storage module; the receiving and storage module digitalizes ultrasonic guide wave signals, stores the signals and transmits the signals to the vehicle-mounted center processing and decision module; and the ultrasonic guide wave signals are filtered and enveloped, features of a wave packet arrived by the ultrasonic guide wave are extracted, the attribute and the actual wave speed of the wave packet in the waveform signals are judged and compared with undamaged condition information in a database, damage features in the waveform signals are extracted, whether damage exists in a high-speed rail or not is judged, the damage degree is judged, and the position of the damage is assessed. Through the system, the detection speed and the detection capability of micro damage of the rail are improved, and the time for occupying the high-speed rail is reduced.

Description

technical field [0001] The invention relates to a system in the technical field of railway safety monitoring and protection, in particular to a high-speed rail track health monitoring system based on ultrasonic guided waves and wireless networks. Background technique [0002] The rapid development of my country's high-speed rail technology has greatly facilitated the travel of passengers, promoted economic development, and eased the pressure of passenger flow in my country. The increasing train speed and passenger flow have posed new challenges to the health status monitoring and maintenance of high-speed rail tracks. The high-speed railway track is one of the large key structures in the high-speed railway project. The mechanical properties of the track will have a direct impact on the running quality of the train. Damages such as corrosion and fatigue due to manufacturing, installation, wear, fatigue, impact, damage, etc. will destroy the integrity of the track, and even ...

AI Technical Summary

Problems solved by technology

[0003] At present, my country's rail flaw detection mainly relies on rail flaw detection vehicles with a relatively slow detection speed (less than 100 km / h) and some manual inspections.

Rail flaw detection vehicles at home and abroad all use ultrasonic flaw detection technology. For the detection of high-speed rail (250-350 km / h) tracks, this flaw detection vehicle has the following two disadvantages: 1) It cannot reliably detect small-sized cracks on the surface of the rail (less than 4mm), especially early fatigue cracks cannot be detected; 2) The occupation of the high-speed rail track by the low-speed flaw detection vehicle seriously affects the operating efficiency of the train

Therefore, this detection method can no longer meet the detection requirements of high-speed rail tracks

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