System and method for monitoring cracks and damage of rail in real time

Abstract

The invention discloses a system and a method for monitoring cracks and damage of a rail in real time. The method comprises the steps of fixing a piezoelectric composite material sensor to the bottom of the rail, detecting the vibration wave signal of the rail by virtue of the piezoelectric composite material sensor, and then transforming a time domain waveform collected into a power spectrum density distribution diagram in a frequency domain and determining whether the rail has a crack or damage according to the distribution characteristics of the power spectral density distribution diagram; when the power spectral density distribution of the power spectrum density distribution diagram is within a low frequency range of 20kHz to 80kHz, determining that the rail has no crack and damage; when the power spectral density distribution of the power spectrum density distribution diagram obviously moves within a high frequency range above 80kHz, determining that the rail of the segment has a crack and damage and then giving alarm reminding. The system and the method are capable of quickly determining whether the rail of the segment has a micro-crack and damage after a train passes through the rail, and then the safety is improved.

Description

technical field [0001] The invention relates to the technical field of high-speed railway infrastructure safety monitoring, in particular to a non-destructive monitoring method and equipment for fast and reliable real-time monitoring of rail cracks and damage. Background technique [0002] With the construction and opening of a large number of high-speed railways in my country, the contradiction between safe transportation and equipment status management has become increasingly prominent. Through the establishment of an effective monitoring system, the long-term monitoring of fixed equipment becomes the guarantee to ensure the safe, reliable and efficient operation of high-speed railways, especially the monitoring of some key weak links of fixed equipment, injection of turnouts, etc. The rails at the turnout are prone to minor damages such as cracking and nuclear damage. If they cannot be discovered in time, they will easily and quickly expand into fatal damage, thereby caus...

AI Technical Summary

Problems solved by technology

[0003] In foreign countries, magnetic flux leakage detection method, eddy current detection method, video screen and photoelectric image detection method, ray detection method, ultrasonic guided wave method, etc. have all been tried to be used in crack and damage monitoring of turnout rails, but experiments have proved that due to their poor reliability, Disadvantages such as high false alarm rate, difficult implementation and difficult cost control have not been widely promoted

Images