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Research on Welding Structure Health Monitoring Using Piezoelectric Impedance Technology

Author: ZhangJianWen
Tutor: ShenXing
School: Nanjing University of Aeronautics and Astronautics
Course: Measuring Technology and Instruments
Keywords: Welded structures Piezoelectric impedance Finite Element Method BP neural network Health index
CLC: TG457
Type: Master's thesis
Year: 2010
Downloads: 69
Quote: 2
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Abstract


With the development of science and technology , and gradually increase the safety awareness and security needs , service engineering structures , how effective , convenient health monitoring is particularly important . Current engineering structures , welding is an important method of connecting the welded structure , however , has continued to rupture accident , health monitoring of the welded structure having a broad engineering background . Impedance piezoelectric technology is a novel structural damage detection techniques , piezoelectric chip as the sensing element , and pasted on the surface of the structure to be detected after applying a high-frequency excitation and extract the piezoelectric impedance signal impedance analysis before and after the injury spectrum the identifiable structure damage . This paper first gives the basic principle of the piezoelectric impedance technology and its simulation analysis , and then crack damage in the structure of aluminum alloy welding test analysis on this basis , and finally the combination of artificial neural network positioning of the damage . The main contents are as follows: 1. Electromechanical coupling characteristics of the mechanical impedance of the structure and PZT theoretical analysis contains structural mechanical impedance of the PZT coupling admittance formula derived in detail , the application of piezoelectric impedance technology for structural health monitoring theory basis. 2 . Welded structure using ANSYS software in lossless and lossy simulation, harmonic response analysis and PZT piezoelectric impedance in a different location away from the injury . The results show that : the piezoelectric impedance is not only sensitive to minor damage appear, and on the change of the position is also sensitive . 3. Determine the the detection structure main material , production of the welding experiments panels and crack damage , experimental platform . Layout scheme and design PZT piezoelectric admittance spectrum analysis of the different bands and different locations , the possibility of damage location proposed application of piezoelectric impedance technology . 4 . Reasonable selection and organization of the sample and the BP neural network used in welding injury positioning , design the BP neural network in the MATLAB environment to determine the location of the crack damage .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding process > Welding of a variety of metal materials and components
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