Non-contact stress detection system and method

Abstract

The invention relates to a non-contact stress detection system and method. The system comprises a coil, an alternating current power supply, a giant magneto resistance element and a steel rail, wherein the giant magneto resistance element is arranged in the coil, the coil is connected with the alternating current power supply, the alternating current power supply on the coil is used for providing alternating current at fixed frequency for the coil, the alternating current can generate an alternating magnetic field, corresponding eddy current is produced by the magnetic field on the steel rail, and the giant magneto resistance element is used for measuring the magnetic field intensity that the magnetic field produced by the alternating current interacts with a magnetic field produced by the eddy current and realizing the detection of stress of the steel rail. The system disclosed by the invention adopts an electromagnetic induction way to measure the stress of the steel rail, and the problems that precision and service life of a contact type stress sensor are affected by vibration of the steel rail can be solved in a non-contact way.

Description

Technical field [0001] The invention relates to the technical field of rail stress detection, in particular to a non-contact stress detection system and method. Background technique [0002] In recent years, with high-speed rail as a national strategy, the role of high-speed rail has become increasingly prominent. As we all know, the most basic infrastructure of high-speed rail is steel rails, which are mainly composed of steel. Various microscopic defects or local stress concentration in the metal structure will cause the failure of the steel structure and equipment and even accidents. After various iron components are processed, even if the components are properly designed, residual stresses inevitably exist in the material. Even if the working condition is under the rated load, the superposition of load and internal stress may cause component stress redistribution and secondary deformation, which will reduce component rigidity and component dimensional stability, and cause a...

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Problems solved by technology

Even if the working condition is under the rated load, the superposition of load and internal stress may lead to redistribution of component stress and secondary deformation, which will reduce the rigidity of the component and the stability of the component size, thereby causing accidents

[0003] At the same time, most railways are laid in the field or on viaducts, the working environment of the equipment is harsh, and there is no special power supply system, so the power consumption of the detection device cannot be ignored

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