Analysis of the Eccentric Problem of Wire Rope Magnetic Flux Leakage Testing

Pan, Shimin; Zhang, Donglai; Zhang, Enchao

doi:10.1109/itnec.2019.8729317

Cited by 14 publications

(5 citation statements)

References 14 publications

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“…At the same time, due to its good stability and anti-interference ability, it does not require high testing environment requirements and can achieve online testing with high automation. Therefore, magnetic flux leakage testing technology is the most suitable electromagnetic testing method for the non-destructive testing of wire ropes [15][16][17]. Zhang et al designed a three-dimensional MFL acquisition system based on unsaturated magnetic excitation using tunnel magnetoresistive (TMR) components, proposed a three-dimensional MFL detection method, and found that three-dimensional MFL color imaging can effectively improve the recognition rate of wire rope breakages [18].…”

Section: Introductionmentioning

confidence: 99%

Research on a Wire Rope Breakage Detection Device for High-Speed Operation Based on the Multistage Excitation Principle

Zhou,

Zhang,

Deng

et al. 2023

Sensors

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Wire rope breakage, as damage easily produced during the service period of wire rope, is an important factor affecting the safe operation of elevators. Especially in the high-speed elevator operation process, the problem of magnetization unsaturation caused by speed effects can easily lead to deformation of the magnetic flux leakage detection signal, thereby affecting the accuracy and reliability of wire breakage quantitative detection. Therefore, this article focuses on the problem that existing wire rope detection methods cannot perform non-destructive testing on high-speed elevator wire ropes and conducts design and experimental research on a high-speed running wire rope breakage detection device based on the principle of multi-stage excitation. The main research content includes simulation research on the multistage excitation, structural design, and simulation optimization of open–close copper sheet magnetizers and the building of a detection device for wire rope breakage detection experimental research. The simulation and experimental results show that the multistage magnetization method can effectively solve the problem of magnetization unsaturation caused by the velocity effect. The multistage excitation device has a good wire breakage recognition effect for speeds less than or equal to 3 m/s. It can detect magnetic leakage signals with a minimum of four broken wires and has good detection accuracy. It is a new and effective wire breakage detection device for high-speed elevator wire rope, providing important technical support for the safe and reliable operation of high-speed elevators.

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Section: Introductionmentioning

confidence: 99%

Research on a Wire Rope Breakage Detection Device for High-Speed Operation Based on the Multistage Excitation Principle

Zhou,

Zhang,

Deng

et al. 2023

Sensors

View full text Add to dashboard Cite

show abstract

“…The magnetic flux leakage (MFL) detection technique is extensively used to diagnose the surface and internal defects of ferromagnetic parts such as wire ropes, oil and gas pipelines, and tracks, because of its advantages associated with a lack of pollution, lack of coupling agents, and its high reliability [ 2 , 3 , 4 ]. The vibration load on the part not only affects the structural stability but also interferes with leakage detection [ 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Wire-Rope Damage Signals Based on a Radial Magnetic Concentrator Bridge Circuit

Jing

Wang

et al. 2022

Sensors

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Hall-effect sensors are used for the non-destructive testing of wire ropes owing to their low power consumption and high operation frequency. The high-speed operation of wire ropes causes vibration inclination at different frequencies, which makes it difficult to detect the ropes. Considering that the radial signal in the magnetic flux leakage (MFL) detection method can respond to damages to the maximum extent possible, this study proposes a radial magnetic concentrator suitable for the non-destructive testing of wire ropes based on theoretical analysis and transient magnetic field simulations. The concentrator improves the radial magnetic circuit, polymerizes the leakage of the magnetic field in the detection device, and the leakage of the magnetic field of the defect converges at the sensor position of the circumferential array to improve the signal-to-noise ratio of the Hall-effect sensor. In addition, the MFL field is homogenized through the structure of the magnetic concentrator when the wire rope is tilted, which weakens the influence of the vibration tilt of the wire rope on the test results. Finally, the experiments show that the amplitude of the wire-rope damage signal is effectively improved by using the proposed radial magnetic concentration technology, hence being convenient for defect analyses.

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“…In other words, lift-off distances between the surface of SWR and sensor is same for all channels. However, because of external interference from the detection environment, each channel will occur unpredictable changes in the lift-off distance, resulting in shaking noise and defect signal distortion, which seriously undermines the accuracy and reliability of detection [1]. Therefore, Zhou [2] studied the spatial information of shaking noise and proposed an improved median filter to remove it.…”

Section: Introductionmentioning

confidence: 99%

Instantaneous lift-off distance estimation in magnetic flux leakage testing of steel wire ropes

Zhou

Ren

Liu

2022

J. Phys.: Conf. Ser.

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Steel wire rope (SWR) defects plagued its application in many important fields, such as cranes, ports, etc. However, the accuracy of SWRs’ local flaws detection based on magnetic flux leakage (MFL) method is susceptible to the lift-off distance. This paper proposes an instantaneous lift-off distance estimation method to study the effect of lift-off distance on MFL detection for SWR. We firstly derive the relation between the lift-off distance and the MFL field strength based on the magnetic dipole model. After obtaining the time-frequency representation of the MFL signal by using multi-synchrosqueezing transform, we extract the instantaneous amplitude (IA) of the strand signal without other noise interference. Finally, the nonlinear least-squares method is used to fit the relation between the IAs of the strand signals and the lift-off distances to achieve the estimation of the instantaneous lift-off distance. A SWR with three local flaws is tested to validate the proposed method. This work provides instantaneous monitoring of lift-off distances, and it can be used in future noise suppressing methods development or quantitative analysis of local flaws.

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Analysis of the Eccentric Problem of Wire Rope Magnetic Flux Leakage Testing

Cited by 14 publications

References 14 publications

Research on a Wire Rope Breakage Detection Device for High-Speed Operation Based on the Multistage Excitation Principle

Research on a Wire Rope Breakage Detection Device for High-Speed Operation Based on the Multistage Excitation Principle

Enhancing Wire-Rope Damage Signals Based on a Radial Magnetic Concentrator Bridge Circuit

Instantaneous lift-off distance estimation in magnetic flux leakage testing of steel wire ropes

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