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Finite Element Simulation to the Effect of Acoustic Spectral Feature by Defects in Homogeneous Media

Author: SunJiHua
Tutor: LiShuGuang
School: China University of Petroleum
Course: Radio Physics
Keywords: Ultrasonic testing Finite Element Simulation Spectrum analysis Sensitive frequency
CLC: TH878.2
Type: Master's thesis
Year: 2008
Downloads: 93
Quote: 0
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Abstract


Modern non-destructive testing technology forward high-precision , high accuracy direction , traditional theoretical and experimental approaches can not meet the requirements of its development , which makes the numerical simulation of more and more applications to ultrasonic nondestructive testing research up . For the detection signal , generally the defect information obtained by analysis in the time domain is limited. Up spectrum analysis method with the development of digital signal processing technology has been widely applied to ultrasonic nondestructive testing , the application spectrum analysis technology can get more information of the defect in the frequency domain . In this paper, the finite element method , the finite element model of the isotropic solid two-dimensional ultrasonic nondestructive testing . First , no defects in the material containing cracks , square cross perforation, a cylindrical cross perforation defects were simulated in the time domain signal can be seen that various characterized the difference of the echo and the amplitude of the transmitted wave ; focus on signal spectrum analysis, calculated defect echo , bottom echo and the transmitted wave of the frequency domain characteristic amount : peak , peak frequency, center frequency , bandwidth, variation of the the FWHM and defects resonance sensitive frequency ; for both cylindrical shaped crossing hole different diameters, to obtain a curve of the variation of the frequency domain characteristic amount transmitted wave variety . Second , by plane and cambered grooves analog , has been the bottom echo amplitude of the different width of the grooves of the same depth and frequency domain characteristics of the different amount of , and at the same time get a different width of the flat-bottomed hole bottom echo frequency domain features amount of variation . Finally , on a variety of metallic and non-metallic inclusions in steel simulation through time-domain analysis of the echo signal phase , to verify the simulation results and theoretical calculations are consistent ; echo and transmitted wave spectrum analysis You can get various inclusions of different frequency domain characteristics . The simulation results can be well identified various defects described herein , prove that the application of the finite element method and spectral analysis techniques to establish the correctness of the simulation program , which provides a reference to the theoretical and experimental research , for further in-depth study of ultrasound non-destructive testing technology provides a new idea .

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Material testing machine and test equipment > Nondestructive flaw detector > Ultrasonic flaw detector
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