System for nondestructive detection on defects of prestress steel strand through ultrasonic guided waves and detection method

Abstract

The invention provides a system and for nondestructive detection on defects of a prestress steel strand through ultrasonic guided waves and a detection method, and relates to the field of nondestructive detection. An analog electric signal is converted into a sound signal, longitudinal axial symmetry mode guided waves are stimulated from the prestress steel strand, and through corresponding echoes, specific positions of defects of the prestress steel strand can be detected. According to the system, a digital signal processing plate card is designed independently, and compared with a conventional digital plate card, the digital signal processing plate card is relatively low in cost and easy to maintain; due to a transmission and receiving combined detection mode, the distance between transmission and receiving of the ultrasonic guided waves in the prestress steel strand can be relatively short, so that relatively small transmission attenuation of the ultrasonic guided waves can be achieved; compared with a conventional transmission and receiving separated detection method, due to that a transmission and receiving combined detection mode is relatively short in detection distance under the same receiving signal to noise ratio, the detection efficiency is improved, and nondestructive detection can be implemented in actual engineering; the digital signal processing plate card in the system provided by the invention has relatively good programmability and flexibility in aspects of signal generation, signal processing and signal display.

Description

technical field [0001] The invention relates to the field of non-destructive testing, in particular to a system and method for detecting defects by using ultrasonic waves. Background technique [0002] The prestressed steel strand is made of six curved steel wires twisted around a central steel wire at a fixed pitch. Due to its high efficiency, economy, high strength, and good relaxation performance, the prestressed steel strand has been widely used in high-rise buildings. , cable-stayed bridges and other prestressed projects. Due to the long-term impact of changes in the working environment and bearing capacity, steel strands are prone to defects such as stress corrosion, indentation, and sudden fracture. Once the stress structure of the steel strand breaks, it will greatly shorten the life of the prestressed project, bury a great safety hazard, and lead to damage and collapse of the prestressed project, which will cause great harm to social stability and economic developm...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies of the prior art and aim at the problems faced by the current nondestructive testing of prestressed steel strands, the present invention provides a system for nondestructive testing of prestressed steel strand defects using guided ultrasonic waves. The digital signal processing board in the system In terms of signal generation, sig

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