scholarly journals Magnetic Flux Leakage Nondestructive Testing Technology of High-Speed Rail Defects

2016 ◽  
Author(s):  
Haixia Zhu ◽  
Wenbo Liu
Keyword(s):  
Nondestructive Testing ◽  
Magnetic Flux ◽  
High Speed ◽  
Magnetic Flux Leakage ◽  
High Speed Rail ◽  
Testing Technology ◽  
Flux Leakage

Numerical Simulation Study of Stress-Magnetization Effect on Different Notch Steel Specimens

2014 ◽  
Vol 989-994 ◽  
pp. 891-897 ◽  
Author(s):  
Xiao Wen Xi ◽  
Shang Kun Ren ◽  
Yin Huang
Keyword(s):  
Magnetic Flux ◽  
Quantitative Research ◽  
Tensile Load ◽  
Magnetic Flux Leakage ◽  
Magnetic Memory ◽  
Metal Magnetic Memory ◽  
Element Analysis ◽  
Damage Degree ◽  
Testing Technology ◽  
Flux Leakage

To study the mechanism of metal magnetic memory (MMM) testing technology, the stress-magnetization effect on 20 steel specimens with different notch angles under exercise of the geomagnetic field and tensile load is simulated by using the finite element analysis (FEA) software ANSYS. With the stimulation, the stress and magnetic flux leakage distribution of the specimens is given. The results showed that internal stress distribution of different notch specimens under external tensile effects is different; The curves of relationship between damage degree of stress concentration and the distribution of magnetic flux leakage is also related to the defect shape and structure; Magnetization decreases with increases of stress at first and then increases with continuing increase of stress, which is called stress magnetization reversal. It provides an important reference for the quantitative research of metal magnetic memory technology.

scholarly journals Influence of Specimen Velocity on the Leakage Signal in Magnetic Flux Leakage Type Nondestructive Testing

2015 ◽  
Vol 34 (2) ◽  
Author(s):  
Lintao Zhang ◽  
Fawzi Belblidia ◽  
Ian Cameron ◽  
Johann Sienz ◽  
Matthew Boat ◽  
...  
Keyword(s):  
Nondestructive Testing ◽  
Magnetic Flux ◽  
Magnetic Flux Leakage ◽  
Flux Leakage

Study on the Application of FPGA in Magnetic Flux Leakage Acquisition System

2013 ◽  
Vol 694-697 ◽  
pp. 1354-1357
Author(s):  
Ming Gang Chai ◽  
Xia Hai ◽  
Xun Wu Gong
Keyword(s):  
Magnetic Flux ◽  
High Speed ◽  
Detection System ◽  
Magnetic Flux Leakage ◽  
Acquisition System ◽  
Time Data ◽  
Communication Module ◽  
Serial Processor ◽  
Data Design ◽  
Flux Leakage

Embedded CPU in traditional magnetic flux leakage detection system was used as the master controller. CPU is serial processor, which making it difficult to collect the large amounts of real-time data. While FPGA has the advantages of high integration, high speed processing, parallel processing. FPGA is applied to magnetic flux leakage acquisition system to solve data acquisition problem. It comes up with the designs of a multi-channel magnetic flux leakage signal selection control module, A/D conversion module and communication module in VHDL language on QuartusII. The experimental results show that each module of the magnetic flux leakage acquisition system based on FPGA can meet the requirements, and can correctly collect magnetic flux leakage signal, convert and transmit data. Design of FPGA-based is programmable in the field, magnetic flux leakage collection system can be flexibly designed for different occasions, and has independent intellectual property rights.

Research on the Embedded Nondestructive Testing System of Oil-Well Tubing

2013 ◽  
Vol 819 ◽  
pp. 176-180
Author(s):  
Jing Xiang Fang ◽  
Tai Yong Wang ◽  
Lu Yang Jing ◽  
Pan Zhang
Keyword(s):  
Operating System ◽  
Nondestructive Testing ◽  
Magnetic Flux ◽  
Data Processing ◽  
Magnetic Flux Leakage ◽  
Testing System ◽  
Oil Well ◽  
Analysis Program ◽  
Visual Data ◽  
Flux Leakage

A Embedded Nondestructive Testing System of Oil-well Tubing based on the method of magnetic flux leakage (MFL) is designed. The function and structure of each part of the system are analyzed. The overall structure of the system and the function of each module are analyzed. The visual data processing and analysis program of magnetic flux leakage signal based on embedded Linux Operating System is designed, and the running interface of the system is given.

Nondestructive testing of turbine disk roots using solid-state GMR sensor arrays and an axial directional scanning system

2020 ◽  
Vol 64 (1-4) ◽  
pp. 525-531
Author(s):  
Juhyeon Park ◽  
Hoyong Lee ◽  
Gyejo Jung ◽  
Jinyi Lee
Keyword(s):  
Magnetic Field ◽  
Nondestructive Testing ◽  
Magnetic Flux ◽  
Permanent Magnets ◽  
Turbine Disk ◽  
Magnetic Sensors ◽  
Magnetic Flux Leakage ◽  
Scanning System ◽  
Sensor Probe ◽  
Flux Leakage

A nondestructive testing device, consisting of a scanner and signal processing circuits was developed to detect cracks in turbine disk roots. The scanner consists of a longitudinal feeder and a fir-tree-shaped sensor probe. The feeder inserted the sensor probe along the grooves of the turbine blade attachment. Meanwhile, permanent magnets were placed in opposite direction, to generate a closed magnetic field between the magnetic sensors located on the crests of the sensor probe. The fatigue crack in the turbine disk root occurred in the circumferential direction of the turbine. As a result, magnetic flux leakage was caused by disturbing the flow of closed magnetic field by permanent magnets. The magnetic flux leakage was measured by a magnetic sensor. The effectiveness of the proposed device has been verified using artificial defects introduced into the turbine disk roots by electric discharge machining.

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