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SOLUTION OF SINGULAR INTEGRAL EQUATION FOR ELASTICITY THEORY WITH THE HELP OF ASYMPTOTIC POLYNOMIAL FUNCTION

Abstract

The paper offers a new method for approximate solution of one type of singular integral equations for elasticity theory which have been studied by other authors. The approximate solution is found in the form of asymptotic polynomial function of a low degree (first approximation) based on the Chebyshev second order polynomial. Other authors have obtained a solution (only in separate points) using a method of mechanical quadrature  and though they used also the Chebyshev polynomial of the second order they applied another system of junctures which were used for the creation of the required formulas.

The suggested method allows not only to find an approximate solution for the whole interval in the form of polynomial, but it also makes it possible to obtain a remainder term in the form of infinite expansion where coefficients are linear functional of the given integral equation and basis functions are the Chebyshev polynomial of the second order. Such presentation of the remainder term of the first approximation permits to find a summand of the infinite series, which will serve as a start for fulfilling the given solution accuracy. This number is a degree of the asymptotic polynomial (second approximation), which will give the approximation to the exact solution with the given accuracy. The examined polynomial functions tend asymptotically to the polynomial of the best uniform approximation in the space C, created for the given operator.

The paper demonstrates a convergence of the approximate solution to the exact one and provides an error estimation. The proposed algorithm for obtaining of the approximate solution and error estimation is easily realized with the help of computing technique and does not require considerable preliminary preparation during programming.

About the Authors

V. P. Gribkova
Belarussian National Technical University


S. M. Kozlov
Belarussian National Technical University


References

1. Kalandia, A. I. (1973) Mathematical Methods for Elasticity Theory. Moscow, Nauka. 303 p. (in Russian).

2. Khubezhdy, Sh. S., Plieva, L. Yu., Besaeva, Z. V. (2011) About Quadrature Formulas for Singular Integrals with Weight Functions. Vladikavkazsky Matematichesky Zhournal [Vladikavkaz Mathematical Journal], 13 (2), 56-62 (in Russian).

3. Gribkova, V. P., Kozlov, S. M. (2011) Uniform Approximations Based on the Chebyshev Polynomial. Matematicheskie Metody v Tekhnike i Tekhnologiiakh - MMTT-24: Sbornik Trudov XXIV Mezhdunarodnoi Nauchnoi Konferentsii [Mathematical Methods in Engineering andTechnology - MMTT-24: Proceedings XXIV International Conference]. Penza, 1, 31-36 (in Russian).

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5. Natanson, I. P. (1949) Constructive Theory of Functions. Moscow; Leningrad, Gostekhizdat. 688 p. (in Russian).

6. Gribkova, V. P. (2013) Efficient Methods of Uniform Approximations Based on the Chebyshev Polynomial. Moscow, Sputnik. 209 p. (in Russian).

7. Gribkova, V. P., Kozlov, S. M. (2012) Approximate Solution of Differential Equations with the Help of Asymptotic Polynomial Function. Differentsial'nye Uravneniia [Differential Equations], 48 (2), 264-274. doi:10.1134/S0012266112020103.

8. Gribkova, V. P., Kozlov, S. M. (2013) Solution of Singular Integro-Differential Equation with the Help of Asymptotic Polynomial Function. Differentsial'nye Uravneniia [Differential Equations], 49 (9), 1150-1159. doi:10.1134/S001226611 3090103.

9. Gribkova, V. P., Kozlov, S. M. (2012) Solution of one Singular Integral Equation with the Help of Asymptotic Polynomial Function. XI Belorusskaia Matematicheskaia Konferentsiia: Tez. Dokl. Mezhdunar. Nauch. Konf. [International Scientific Conference “XIth Belarusian Mathematical Conference” (BMC-XI): Abstracts of Reports]. Minsk, Part 3, 7-8 (in Russian).

10. Gribkova, V. P., Kozlov, S. M. (2012) Approximate Solution of One Equation for Wing Theory While Using Method of Asymptotic Polynomial Function. Nauka i Tekhnika [Science and Technique], 5, 78-86 (in Russian).


Review

For citations:


Gribkova V.P., Kozlov S.M. SOLUTION OF SINGULAR INTEGRAL EQUATION FOR ELASTICITY THEORY WITH THE HELP OF ASYMPTOTIC POLYNOMIAL FUNCTION. Science & Technique. 2014;(6):17-26. (In Russ.)

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ISSN 2227-1031 (Print)
ISSN 2414-0392 (Online)