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Broken Wire Rope Magnetic Flux Leakage Tesking and Test Signal Processing

Author: LiuSiGuang
Tutor: TanJiWen
School: Qingdao Technological University
Course: Mechanical and Electronic Engineering
Keywords: Wire Rope Broken wire Hall element Data acquisition card Virtual instrument Wavelet Transform Neural Networks
CLC: TG115.284
Type: Master's thesis
Year: 2010
Downloads: 66
Quote: 0
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Abstract


The wire rope is widely used in the national economy, major industries of mining, metallurgy, transportation, ports, tourism plays a crucial role. Complex wire rope strand structure and poor working conditions make it prone to wear, corrosion, fatigue, broken wire damage in use, leading to the decline of its strength, creating a safety hazard. Run in the wire rope, once broken, it will cause a very serious casualties and economic losses. In addition, not yet formed a theory and reliable method for scientific evaluation of the safety of the wire rope in service. Therefore, wire rope damage detection has become the world, both theoretical significance, have important practical value research topic. Broken wire is one of the main forms of wire rope damage. On the basis of comprehensive analysis and discusses the wire rope types and damage forms, in-depth study of the generation and distribution characteristics of of Wire Ropes injury signal exciter design, damage the detector design, damage signal processing and quantitative identification and On this basis, developed a the Broken Wires injury to detect virtual instrument system. Wire Ropes principle of magnetic flux leakage detection and leakage magnetic field characteristics, the analysis of the factors that affect the leakage magnetic field distribution in the excitation through the modeling analysis of the magnetic circuit structure parameters on the basis of the development of the exciter, exciter verified by experiments ability; selection of integrated Hall element leakage magnetic field to detect broken wires, lift-off, the Hall element arrangement and the number of test results, and turn on the detector and signal preprocessing system developed. NI PXI bus, develop a PXI-6281 data acquisition card as the core the Wire Ropes damage detection device, real-time online the Wire Ropes damage detection. Use of the the visualization software LabVIEW to develop a the Wire Ropes damage detection virtual instrument system, and provides a friendly interactive interface for wire rope broken wire damage detection. Wavelet theory and noise cancellation method, and compared to determine the optimal wavelet basis Wire Ropes signal filtering process. BP neural network model to establish the quantitative detection of broken wire damage; utilize due to the Wire Ropes injuries are concentrated in the outer layer, steel wire rope steel beam instead of making different combinations of the broken wire (distributed in the outermost layer 2) of the specimen; This design of detection systems for damage detection of the specimen and extracts a feature value, and the training of the neural network; and verified by experiments, error substantially below 10%, indicating that the neural network model can be built herein Broken Wires injury quantitative identification.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallurgy ( Physical Metallurgy ) > Analytical tests of the metal (Metal Testing and Materials ) > Physical test method > NDT > Magnetic flaw detection
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