scholarly journals The use of a magnetic flux leakage in the assessment of the technical state of a steel wire rope subjected to bending

2018 ◽  
Vol 48 (1) ◽  
pp. 493-513
Author(s):  
Paweł Mazurek ◽  
Jerzy Kwaśniewski ◽  
Maciej Roskosz ◽  
Ryszard Siwoń-Olszewski
Keyword(s):  
Magnetic Field ◽  
Steel Wire ◽  
Wire Rope ◽  
Technical State ◽  
Magnetic Flux Leakage ◽  
Wire Ropes ◽  
State Of Stress ◽  
Real Objects ◽  
The Relationship ◽  
Flux Leakage

Abstract The technical state of steel wire ropes has a decisive impact on the safety of people using the equipment in which they are installed. The basis for increasing safety is the ability to assess the condition of the working steel wire. The article presents the use of magnetometric sensors to determine the relationship between the number of steel wire rope bends and its magnetic field induction value. This knowledge, referred to ropes working on real objects, allows to determine the state of stress prevailing in them as well as their condition.

scholarly journals Design of Tunnel Magnetoresistive-Based Circular MFL Sensor Array for the Detection of Flaws in Steel Wire Rope

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Liu Xiucheng ◽  
Wang Yujue ◽  
Wu Bin ◽  
Gao Zhen ◽  
He Cunfu
Keyword(s):  
Magnetic Field ◽  
Sensor Array ◽  
Steel Wire ◽  
Flaw Detection ◽  
Sensor Arrays ◽  
Wire Rope ◽  
Mutual Correlation ◽  
Wire Ropes ◽  
Technical Requirements ◽  
Lift Off

Tunnel magnetoresistive (TMR) devices have superior performances in weak magnetic field detection. In this study, TMR devices were first employed to form a circular magnetic flux leakage (MFL) sensor for slight wire rope flaw detection. Two versions of this tailor-made circular TMR-based sensor array were presented for the inspection of wire ropes with the diameters of 14 mm and 40 mm, respectively. Helmholtz-like coils or a ferrite magnet-based magnetizer was selected to provide the proper magnetic field, in order to meet the technical requirements of the TMR devices. The coefficient of variance in the flaw detection performance of the sensor array elements was experimentally estimated at 4.05%. Both versions of the MFL sensor array were able to detect multiple single-broken wire flaws in the wire ropes. The accurate axial and circumferential positions of these broken wire flaws were estimated from the MFL scanning image results. In addition, the proposed TMR-based sensor array was applied to detect the MFL signal induced by slight surface wear defects. A mutual correlation analysis method was used to distinguish the signals caused by the lift-off fluctuation from the MFL scanning image results. The MFL sensor arrays presented in this study provide inspiration for the designing of tailor-made TMR-based circular sensor arrays for cylindrical ferromagnetic structural inspections.

Magnetic flux leakage–based local damage detection and quantification for steel wire rope non-destructive evaluation

2017 ◽  
Vol 29 (17) ◽  
pp. 3396-3410 ◽  
Author(s):  
Ju-Won Kim ◽  
Seunghee Park
Keyword(s):  
Magnetic Flux ◽  
Damage Detection ◽  
Permanent Magnets ◽  
Steel Wire ◽  
Threshold Value ◽  
Wire Rope ◽  
Magnetic Flux Leakage ◽  
Magnetic Flux Density ◽  
Sensor Head ◽  
Flux Leakage

A magnetic flux leakage method was applied to detect damage when inspecting steel wire rope. A multi-channel magnetic flux leakage sensor head was fabricated using Hall sensors and permanent magnets to adapt to the wire rope. Three types of artificial damage were created on a wire rope specimen. The magnetic flux leakage sensor head scanned the damaged specimen to measure the magnetic flux density while the damage was expanding in three steps. Signal processing processes including the enveloping process based on Hilbert transform were performed to clarify the flux leakage signal due to the damage. The enveloped signals were then analyzed for objective damage detection by comparing with the threshold value. For improvement of quantitative analysis, three types of new damage indexes that utilize the relationship between the enveloped magnetic flux leakage signal and the threshold value were additionally proposed. By using the proposed damage indexes and the general damage indexes for the magnetic flux leakage method, the detected magnetic flux leakage signals from each damage type were quantified. The trends of the extracted damage indexes according to damage levels were analyzed to examine the applicability and reliability of the proposed damage indexes for the magnetic flux leakage based wire rope inspection.

Study of Accumulated Defects of Steel Wire Ropes

2011 ◽  
Vol 177 ◽  
pp. 159-167 ◽  
Author(s):  
Michal Lesňák ◽  
Jaroslav Foukal ◽  
Lukáš Slivečka ◽  
Jana Trojková
Keyword(s):  
Magnetic Field ◽  
Field Distribution ◽  
Radial Direction ◽  
Surface Defects ◽  
Steel Wire ◽  
Wire Rope ◽  
Magnetic Field Distribution ◽  
Cylinder Axis ◽  
Wire Ropes ◽  
The Face

The article deals with the accumulated defect impact on magnetic field distribution around a magnetized rope. A study of such effects was made on a cylinder-shaped model of steel wire rope with a diameter of 40 mm, in which individual wires with a diameter of 1 mm are parallel to the cylinder axis. Defects are wire breaks with the face distance of 1 mm. An analysis was made of the accumulated defect responses in a rope in one radial direction at various distances from the rope axis, then in two different radial directions, and surface defects in the direction of the rope.

Research of Non-Destructive Testing of Wire Rope Using Magnetic Flux Leakage

2012 ◽  
Vol 189 ◽  
pp. 255-259 ◽  
Author(s):  
Xiao Yong Zhong ◽  
Xiao Hong Zhang
Keyword(s):  
Magnetic Flux ◽  
Permanent Magnets ◽  
Steel Wire ◽  
Wire Rope ◽  
Magnetic Flux Leakage ◽  
Good Resolution ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Non Destructive ◽  
Flux Leakage

Based on the magnetic theory, the paper reviewed the factors of affecting the distribution of magnetic flux leakage (MFL) on the ferromagnetic material and analyzed the wire rope defects characters from MFL signal. A non-destructive testing (NDT) instrument of steel wire rope using magnetic flux leakage was presented in this paper. By using permanent magnets to magnetize wire rope and using Hall element arrays to test MFL, Intelligent signal processing was applied for effective discrimination of wire rope’s flaws. The experiment results show the degree and the width of defects, the annular distribution of localized flaws such as concentrated or dispersive broken wires can be well distinguished. The instrument can be used conveniently with good resolution and repeatability and can meet the requirement of real time.

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