Seamless steel rail stress detection device and method based on ultrasonic guided waves and strain gauge

Abstract

The invention provides a seamless steel rail stress detection device and method based on ultrasonic guided waves and a strain gauge. The device comprises guided wave group speed measurement probes, a guided wave emitting module, a guided wave receiving and data processing module, a strain sensor, a temperature sensor and a strain information processing module, wherein the probes, the strain sensor and the temperature sensor are distributed along the same steel rail, the probes and the temperature sensor are used for measuring a guided wave group speed value and a temperature value of the steel rail, the strain sensor is used for measuring a longitudinal strain value of the steel rail and measures a current strain value of the steel rail when the guided wave group speed value and the rail temperature meet a preset function relation with longitudinal stress being 0, the current strain value is taken as an initial value of the system, the rail temperature meeting the function is taken as a locked rail temperature, the temperature sensor and the strain sensor measure real-time temperature and real-time strain in actual measurement of the longitudinal stress, the real-time strain and the initial value of the system are compared, steel rail length change is obtained, the real-time temperature and the locked rail temperature are compared, then temperature change is obtained, and accordingly, a longitudinal stress value is obtained.

Description

technical field [0001] The present invention relates to the technical field of railway detection, in particular to seamless rail stress detection, and more specifically to a seamless rail longitudinal stress detection device and method based on ultrasonic guided waves and strain gauges (strain sensors). Background technique [0002] With the rapid development of my country's high-speed railways, seamless lines, a new type of track structure, have been widely used. Seamless lines eliminate rail gaps, making trains run more smoothly and faster. The running speed has exceeded 300km / h. Such a high speed poses new challenges to the safety of railway transportation. [0003] Due to the disappearance of the track seam of the seamless line, the rail cannot freely expand and contract when the temperature changes. According to Hooke's law calculation, it can be known that when the temperature of the long rail changes by 1°C relative to the locked rail temperature, the longitudinal stre...

AI Technical Summary

Problems solved by technology

Aiming at the problem that the ultrasonic guided wave technology needs to establish a complex two-dimensional calibration database to detect the rail stress, the stress method needs to be installed before the long rail construction is locked, and the initial value is measured while the construction is locked. The ultrasonic guided wave technology and the strain sensor are used to measure Technology combined, developed the technical solution of the present invention

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