| Wire ropes are widely used in all areas of life.Many fields such as lifting machinery,ship transportation,oil exploration,aerospace,rescue,etc.cannot do without the help of wire rope.There are many wire rope non-destructive testing technology that mainly based on magnetic flux leakage testing.The focus of research on the topics is mostly on the innovation of detection devices and filtering of signals.The analysis of final signal is mainly qualitative and seldom quantitative analysis.So it’s important to strengthen quantitative analysis that can reduce accidents from wire rope’s when workers are working.The thesis aiming at the deficiency that quantitative analysis of wire rope,putted forward a method by literature research method that based magnetic dipole and magnetic flux-leakage testing.The method can deduce size of defect by the signal of magnetic flux-leakage.This has a certain guiding role for the judging of wire rope defects.The thesis deduced mathematical relationship between detection signal and sizing of flaws by the related knowledge of higher mathematics that overcome the black box characteristics of other analysis methods.The mathematical relationship was verified and corrected by the model of AC/DC in COMSOL with finite element method.Analyzed the signal by different permanent magnet and arrangement of sensor by COMSOL.A device of magnetic flux leakage signal acquisition with probe type by the result of analyzing.The hardware were compared and selected in the testing system by single-chip.A software of upper-computer and lower-computer was coded by C and C# based on the computer science such as data structure.A experimental device was built.Firstly,The feasibility test of the test platform is carried out.Secondly,the different test materials were analyzed.The experimental results show that the mathematical relationship can forecast sizing of flaws.The average relative error is 9.1%.The result proved the method is feasible. |
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