A real-time and high-precision acfm crack monitoring system

Abstract

The invention discloses a real-time high-precision ACFM (alternating current field measurement) crack state monitoring system. The real-time high-precision ACFM crack state monitoring system comprises a rotary magnetic field signal exciting source, an ACFM monitoring mobile platform, a platform driving power supply module, a displacement sensor, a monitoring probe, a signal conditioning module, a lock phase amplifying module, a PLC (programmable logic controller) lower computer, a system control subsystem and an intelligent defect recognition subsystem, wherein the rotary magnetic field signal exciting source inducts an electromagnetic field on the surface of a to-be-tested workpiece; the monitoring probe obtains a distortion signal; the signal conditioning module pretreats the distortion signal; the lock phase amplifying module defects the vector of the distortion signal; the PLC lower computer controls an automatic monitoring platform; the system control subsystem exchanges data; the intelligent defect recognition subsystem analyzes and recognizes crack defects intelligently. The real-time high-precision ACFM crack state monitoring system provided by the invention monitors a steel bonded state in real time, detects, intelligently recognizes, monitors and prewarns structure defects, improves the monitoring reliability and engineering practicability effectively, and has high popularization and application value.

Description

technical field [0001] The invention belongs to the technical field of AC electromagnetic field monitoring, in particular to a real-time and high-precision ACFM crack state monitoring system. Background technique [0002] In the production and use of steel materials, internal and external surface defects such as corrosion and cracks often occur, and major accidents such as aircraft crashes, pipeline ruptures, and boiler explosions have occurred many times due to mechanical cracks and other defects. In the field of offshore oil engineering, equipment such as offshore platforms and submarine pipelines have served in harsh marine environments for a long time, and are prone to structural failures such as corrosion, fatigue, and fracture. At present, the application of electromagnetic non-destructive testing technology on this kind of steel infrastructure structure has solved a considerable part of the problem of structural failure due to defects, such as: alternating current ele...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a real-time high-precision ACFM crack state monitoring system, aiming to solve the problem that the current detection of steel structures by artificial periodic AC electromagnetic fields is not only limited by the working environment of the structure, but also cannot fully use the working life of the structure, or even Incomplete detection may occur, resulting in human error in judgment, resulting in low detection efficiency and reliability, which cannot meet the requirements of the modern large-scale industrial era

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