A method for on-line detection of discontinuities in one-dimensional structures

Abstract

The invention discloses a one-dimensional structure incontinuity on-line detection method which comprises the following steps: selecting detecting guided waves; arranging detecting points, wherein each detecting point includes a vibrating signal transceiving device and a data process device; measuring a vibrating signal by utilizing a sensor; calculating the statistics, the group velocity and the attenuation rate; calculating the time frequency spectrum of the vibration signal; according to the sequence of the echoing moment t1n and the echoing moment t2n of vibrating signals a1 and a2 detected from different sensors by utilizing incontinuity of the same structure utilized by echoes of different sensors, judging whether the structure incontinuity is on the left side or the right side of an exciting bank; calculating the distance between a structure discontinuous point and the exciting bank; calculating scattering coefficients of all structure discontinuous places; identifying types. With adoption of the method, structure incontinuity can be rapidly positioned, incontinuity types can be identified, the position and damage degree of a defect on an important one-dimensional structure such as a pipeline or a steel rail can be mastered in real time and accurately estimated, and the detecting speed is high without affecting the normal operation of pipeline transportation and rail transit.

Description

technical field [0001] The invention relates to an on-line detection method for one-dimensional structure discontinuity, which belongs to the field of non-destructive detection. Background technique [0002] Important one-dimensional structures such as rails and pipes, due to the impact of external environment such as dynamic impact, friction, and man-made damage, will inevitably produce structural defects such as wear, fatigue damage, and rupture during use, which will cause major damage to social security and national interests. influences. Therefore, real-time monitoring of the location and extent of defects in such one-dimensional structures is a necessary measure to ensure operational safety and economic benefits. [0003] The traditional one-dimensional structure detection method in our country mainly relies on offline detection and manual detection. Important one-dimensional engineering structures are mainly pipelines and rails. Ultrasonic scanning is often used for...

AI Technical Summary

Problems solved by technology

The important one-dimensional engineering structures are mainly pipelines and rails. The detection of these long-distance one-dimensional structures mostly uses ultrasonic scanning. These detection methods lack real-time performance and cannot monitor the health status of one-dimensional structures online in real time.

For example, rail detection vehicles are often used to scan the surface of the rails with ultrasonic waves. Although the detection accuracy of the rail detection vehicles is high, it is expensive and has high operating costs. The detection affects normal rail operations and there are detection blind spots such as the bottom of the rails. , unable to meet the requirements of the current high-speed and heavy-duty railways in my country for further improvement of track safety

Secondly, the advanced detection technologies are all abroad, in contrast, my country lacks online one-dimensional detection methods

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