Dissertation
Dissertation > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Data processing, data processing system > Data collection and processing systems

Metal magnetic bomb, magnetic memory signal acquisition and processing system research

Author YangChao
Tutor ChenJuan
School Beijing University of Chemical Technology
Course Detection Technology and Automation
Keywords Non-destructive testing Ferromagnetic materials Magnetic bomb Magnetic Memory The digital filter
CLC TP274.2
Type Master's thesis
Year 2009
Downloads 127
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Ferromagnetic material has good elastic and plastic , and has a hard , corrosion , etc., is widely used at present and in the future industrial materials and can not be replaced . In industrial production , machining of parts made ??of ferromagnetic material and composition of the product , in the course of quality problems , damage issues and end of life , not only to the normal operation of the product , or even related to personal safety. Thus , various properties of the ferromagnetic material , such as stress , hardness, fatigue, and other aspects of test has important significance. With the development of modern industry , the ferromagnetic material components for stress detection has become to ensure safe operation of equipment as well as an important means of product quality . Relative to other common stress detection methods, elastic and magnetic metal magnetic memory testing methods in recent years to develop two more advanced NDT techniques . They are the internal stress in the detection of ferromagnetic materials , fatigue life , hardness , microstructure, surface state all have their own advantages, products or equipment can conduct an overall analysis, evaluation , development potential is very dynamic NDT methods . In this paper, elastic and magnetic metal magnetic memory signal generation mechanism and various properties of ferromagnetic materials conducted in-depth and meticulous research . And on this basis , developed based on metal magnetic memory technology magnetic shells and ferromagnetic material stress testing instruments. The instrument includes sensors, signal conditioning circuits, and MCUs three parts. For the magneto-elastic metal detector high-frequency interference signals appearing proposed selection field programmable logic device (FPGA) to implement low-pass digital filter to filter high frequency noise. Further be described using VHDL language , and simulation verification, simultaneously applied magnetic bombs online testing, to achieve a higher accuracy.

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