Математичне моделювання процесів діагностики залишкових напружень в зварних з'єднаннях труб великих діаметрів
Journal Title: Математичне моделювання - Year 2018, Vol 1, Issue 2
Abstract
MATHEMATICAL MODELING OF THE PROCESSES OF DIAGNOSTICS OF THE OUTDOOR DEFINITIONS IN THE HARVEST DOWN TUBES OF THE GREAT DIAMETER Kadilnikov S.V. Abstract Analysis of the state of the pipe market over the last decade has shown that in connection with the intensive development of computer technology it became possible to determine the residual welding stresses. The basis of such techniques is mathematical modeling, which allows the use of systems for measuring, recording and processing data for the diagnosis of stress-strain state. The purpose of this study is to process the input and output signals of the measuring apparatus for the diagnosis of residual stresses in the welding seams of pipes of large diameters using the method of magnetic memory of the metal. The final formation of the welding on the stresses occurs after the completion of the welding process, along with this there is a redistribution of the stress-deformed state of the design, there are residual deformations, and as a result, the internal stress of the structure is redistributed, with the greatest concentration of stresses and deformations occurring in the zone of the weld and in the zone of the alloy. In the article a mathematical model of diagnostics of residual stresses in welding joints of pipes of large diameters is developed. In this research, measurements of samples were carried out for the presence of residual stresses in them using the method of magnetic memory of the metal with the help of the INN-1M-4 instrument of measurement of the voltage concentration of the model. Difference equations for program realization of the digital differentiation algorithm with different number of points of the input signal are obtained. A structural scheme of the algorithm of the program realization of a discrete transfer function is developed. Signals from measuring converters after preprocessing, which consists in converting an analog signal into digital, are received on a bandpass filter whose purpose is to cut off the low frequency and high frequency components. The measurement method is based on three consecutive signal samples that are performed within the part of the signal period, which reduces the measurement time. The automatic selection of the interval of the samples is determined by the frequency range of the signal. The main method of signal separation is twofold rapid Fourier transform (direct and reverse) and Hilbert transform. The spectrum of the input signal translated into a digital code is cut off by a limiter, then a direct fast Fourier transform is performed. Further transformations follow two parallel channels, in one of them the inverse Fourier transform is made, in the other the signal is previously subjected to the transformation of Hilbert. The proposed method for measuring residual stresses has a fairly wide area of rational use, and therefore can be used for other technical objects in which welding technologies are used. References [1] Antonov, A.A. Steklov, O.I. Investigation of technological residual stresses in welded joints of main pipelines // Procuring production in mechanical engineering. −2012. – No. 3. – P.13–19 (in Russian). [2] Anuchkin, M.P. Goritsky, V.N. Mironenko, B.I. Pipes for pipelines. – M.: Nedra, 1986. – 231 p. (in Russian). [3] Gatovsky KM, Karhin V.A. Theory of welding deformations and stresses. L .: LKI. 1980. 331 p. (in Russian). [4] Medvedev A.Yu., Bychkov V.M., Tarasenko E.E., Izmaylova N.F., Dubin A.I. Investigation of residual stresses in compounds obtained by linear friction welding. 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Numerical simulation of a welded joint made of steel 15x5m and evaluation of its stress-strain state // Proc. Ufa. 2008. p. 135–151 (in Russian). [10] Fedoseeva, E.M, Ignatov, M.N., Letyagin, I.Yu., Kazymov, K.P. Modern methods of identification of non-metallic inclusions in welded joints of pipe steels // Heavy mechanical engineering. 2011. No. 1. C. 45–47 (in Russian). [11] Fedoseeva EM, Olshanskaya T.V., Ignatov M.N. Simulation of non-stationary processes in the welded joint of the pipeline. Heavy machinery. 2011. № 3, p. 31–37 (in Russian). [12] Stoney G.G. The tension of metallic films deposited by electrolysis // Proc. Roy. Soc. London Ser. A. 1999. Vol. 82. No. 553. pp. 172–175. [13] Michaleris P., Dantzig J., Tortorelli D. Minimization of welding residual stress and distortion in large structures // Welding Journal. 1999. Vol. 78 (11). pp. 361–366. [14] Levenberg L.I. 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Authors and Affiliations
С. В. Кадильников
Keywords
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- EP ID EP444780
- DOI 10.31319/2519-8106.2(39)2018.154245
- Views 88
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