Обчислення вірогідності визначення дефектів деталей методами неруйнівного контролю
Journal Title: Математичне моделювання - Year 2017, Vol 1, Issue 1
Abstract
CALCULATION OF VIRGINITY OF DETERMINATION OF DEFECTS OF DETAILS BY NON-GOVERNMENTAL CONTROL METHODS Shmatko D.Z, Kochneva E.V. Abstract Non-destructive methods of control or defectoscopy are a generic name for methods of control of materials or products used to find defects, homogeneity of the macrostructure, deviations in the chemical composition and other purposes that do not require the destruction of samples of the material or article as a whole. The widespread application of non-destructive methods of control avoids large losses of time and material costs, provides partial or complete automation of control operations while significantly improving the quality and reliability of products and parts. In the next time, no technological process of obtaining responsible products will be introduced into the industry without an appropriate system of non-destructive testing. The main areas of application of non-destructive types of control are defectoscopy of critical parts and devices, defectoscopy of parts and appliances for prolonged operation, continuous defectoscopy of particularly responsible units and devices, conducting studies on the structure of metals and defects in products and parts, in order to improve their manufacturing technology. For researches of parts or products by methods of non-destructive testing, it is necessary to select the equipment that will meet the task, that is, such devices, which with a sufficient degree of certainty will reveal the most dangerous and characteristic defects in the controlled product or component. The second condition is the problem of reliability, which is required to identify defects that are dangerous for the operation of a part or product. And the third condition is the setting up of control equipment, namely the selection of sensitivity and resolving its ability in such a way as to satisfy the second condition. When measuring, measuring instruments of higher accuracy are used and more modern measurement methods are used. However, due to the inevitable presence of any measure of random errors, the true value of the measured value remains unknown and instead of it takes some average arithmetic value and consider it, taking into account the theory of probability and mathematical statistics, the most appropriate approximation to the true value. The accuracy of the measurement is influenced by systematic errors. But measurements must be made in such a way that there are no systematic errors. The theory of random errors is based on two axioms: randomness and distribution. Rederences [1] Bocharov P.P., Pechenkin A.V. Theory of probabilities. Mathematical Statistics – 2nd ed. – Moscow: Fizmatlit, 2005 – 296 pp. [2] Venttsel E.S., Ovcharov L.A. Probability theory and its engineering applications. Educational manual for high schools. – 2nd ed. – M .: Vyssh.shk., 2000 – 480 p. [3] Gutter R.S., Ovchinsky B.V. Elements of numerical analysis and mathematical processing of the results of experience. – Moscow: Fizmatlit, 1986 – 356 pp. [4] Sukhov AN Mathematical processing of measurement results. Tutorial. – M .: MISI, 1982 – 89 p. [5] Chkalova O.N. Fundamentals of scientific research. – Kiev Higher school, 1978 – 120 p. [6] Kanevsky I.N. Non-destructive methods of control: study. allowance / I.N.Kanevsky, E.N.Salnikova. – Vladivostok: DVSTU, 2007 – 243s. [7] Bronshtein IN, Semendyaev K.A. Manual for maths for engineers – 3rd ed. corrected – Moscow: Nauka, 1986 – 544 pp. [8] Non-destructive testing: Cases / Ed. R.MackMaster. Kn.1 – ML: Energy. 1965. – 504 pp. [9] Novokschenova SM Defects in steel: Cases – Moscow: Metallurgy, 1984. – 200 p. [10] Belokur I.P. Defectology and non-destructive testing. – Kyiv: Higher School 1990. – 207 pp. [11] Non-destructive control of metals and products: Issues / Ed. G.Samoilovich. – Moscow: Mechanical engineering, 1976. – 456 p.
Authors and Affiliations
Д. З. Шматко, О. В. Кочнева
Keywords
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