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 Posted: Thu 22:37, 13 Jan 2011 Post subject: stivali ugg Fast Fourier transform based on galvan |
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Fast Fourier transform based on galvanized steel body ultrasonic testing of spot welded joints Number increases, the weld nugget diameter and the maximum tensile load of the sample is gradually increased, and high-frequency signal FFT, the maximum amplitude is gradually declining. Nugget diameter and maximum tensile load of the sample are high-frequency amplitude and the signal is inversely proportional to the maximum. Demonstrates the use of galvanized steel ultrasonic signal by the Fourier-A showed strong zoom scale: fast Fourier transform based on galvanized steel body ultrasonic testing of spot welded joints of a group number 6 ~ ~ (a) the average tensile load in each group value of group number group number maximum tensile load / kN (b) nugget diameter and the average of each group (c) high-frequency amplitude average in each group (d) tensile load and the relationship between high amplitude samples in each group Figure 8 Comparison of performance parameters, for high-frequency part of the amplitude after the spot size can determine the size of the sample and the sample nugget the level of intensity. Figure 8d the first group of samples 2,3 and 4, with the largest stretch of basically high-frequency amplitude increases linearly with decreasing load, and high-frequency amplitude of the sample group 1 is much higher than other groups of samples, and high-frequency signal from group 1 to group 2, changes in the slope of the large than the other groups. The corresponding l-group of specimens is precisely the argument is too small for the sample caused by cold solder joint, indicating that galvanized steel after ultrasonic signal by the Fourier transform, can be distinguished Weld nugget samples and specimens. 7 Conclusion fast Fourier transform of the detected ultrasonic signal transformation of the signal's frequency domain characteristics. Analysis showed that high-frequency signal amplitude, with the nugget diameter and the increase of tensile load drop. According to the amplitude of high frequency components, not only can determine the sample spot welding galvanized sheets the size of the nuclear level of tensile strength,Moncler online, and can distinguish between Weld nugget samples and specimens. References: [13 INDUSTRY AUTOMATION, Zhao. The quality of automotive body spot weld ultrasonic testing EJ-]. NDT,ugg stivali, 2OO2, (1) :37-39. [2] Li Dadong, Yuteng Yi, Jin Xiang, et al. Hot spot properties of galvanized steel [J]. Steel Vanadium Titanium, 2001,22 (4) :16-2l_ [33 U.S. dollars loss detection Society series, \American NDT Manual (ultrasound volume) the next volume of [M]. Shanghai: World Publishing Company ,1996.196-210. [4] Ming Ji. With digital signal processing technology of ultrasonic echo signal model [D]. Dalian: Dalian University of Technology, 2003. \organized. forum is organized by Jiangsu Province Special Equipment Safety Supervision Inspection Institute and the Institute of Mechanical Engineering, Jiangsu Province branch of non-destructive testing, organized mass will be held during the academic exchange activities, organization of technical equipment, promotion, display and supply and demand negotiations and other business activities. related to preparations is in full swing. welcome to come for information, contact the academic exchange and business. \Forum to strengthen cooperation in international and domestic exchanges, and promote the development of China's non-destructive testing of science and technology, improve and enhance the competitiveness of enterprises for the purpose,moncler günstig, choose the latest NDT research, advanced technology and equipment for the propaganda project for industry collaboration, new technology applications and new products equipment material sales to provide a platform. \,ugg prezzo, more and more participants (the participants of the Third Forum of more than 350 people). forum non-destructive testing has become the mainstream technology and business communication platform. Compared with the previous forums, the upcoming \\people: strong Tianpeng; Mobile: 13776663939; E-mail: jpviqtp@vip.163.com. Preparatory Group Contact: Chen Yankang (025-84404024,13813893470), Yu Yanping (025-84408576,13951630079); Fax: 025 -84406294; E-mail: cheny-ankang@gmail.com. (strong Tianpeng) 2oo7 Vol 29 No. 2 83 相关的主题文章： Moncler jacken Data warehouse meta-rule guided ass Measures to prevent the rope slipping _3021 sample moncler günstig Using Digital Impact Testing Mach |
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