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Research on the Dynamic Property and Fault Diagnosis of Punch Machine

Author: SuHouJun
Tutor: YangJiaJun
School: Huazhong University of Science and Technology
Course: Mechanical Design and Theory
Keywords: Punch machine Electromotor slider-crank-mechanism Dynamic property Fault diagnosis Wavelet analysis
CLC: TG385
Type: Master's thesis
Year: 2004
Downloads: 128
Quote: 0
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Abstract


Punch machine is a more complicated system in which implement equipment ,such as electromotor-slider-crank-mechanism, is key part affecting its dynamic property. At present, there are more documents that analyse electromotor or slider-crank-mechanism, but less research on their coupling relation each other. Based on bond graph theory, the paper consider the coupling relation of electromotor and slider-crank-mechanism, upbuild dynamics model and educe their relationship. Secondly,the paper research into dynamic property of electromotor slider-crank-mechanism by computer simulation and physical simulation, make simulation soft by Matlab language.The results by combining computer simulation and physical simulation each other indicate that there is coupling effect between electromotor and slider-crank-mechanism and the dynamics model should be supposed under the condition of supposing the rotate speed of cranks is not uniformity. At the same time, should avoid that the rotate speed of crank is equal to the being frequency of the mechanism. According to the features of punch machine, the paper discuss the subject of failure of oil film’s unstabilization and misalignment of shaft system. The paper upbuild dynamic modal and discuss its mechanism each other. The paper focused on the coupling effect and overcome the disadvantage of single research. In allusion to complex mechanical failure mechanism and the difficulty of catching the features of mechanical failure, the paper make out signal checking and analysis system based on wavelet analysis. In the discussing of digital signal processing, the particular effect of wavelet theory in the field of fault diagnosis is illustrated. Besides,the paper expatiate hardware and soft design method of this system and research into.many key techniques and application in this system. In this system, solve the problem of less data processing and inexact arithmetic by applying VC++ and Matlab Language、wavelet analysis etc. So the system availably assure exact arithmetic by use of the advanced method of digital filter and soft integral. The research provides a practical way of the dynamic analysis and signal checking and analysis system of punch machine, the signal checking and analysis system based on wavelet analysis has a litter engineering significance.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal pressure processing > Cold stamping ( sheet metal processing) > Cold punching machinery and equipment
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