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JOURNALS // Zhurnal Vychislitel'noi Matematiki i Matematicheskoi Fiziki // Archive

Zh. Vychisl. Mat. Mat. Fiz., 2023 Volume 63, Number 5, Pages 765–777 (Mi zvmmf11554)

This article is cited in 1 paper

Mathematical physics

Reconstruction of two functions in the model of vibrations of a string one end of which is placed in a moving medium

O. A. Andreyanovaa, A. Yu. Shcheglovb

a Lomonosov Moscow State University, 119991, Moscow, Russia
b MSU-FPI University in Shenzhen, Longgang District, Dayunsirchen, 518172, Shenzhen, Guangdong, China

Abstract: The paper considers an inverse problem of determining the coefficients in the model of small transverse vibrations of a homogeneous finite string one end of which is placed in a moving medium and the other is free. The vibrations are simulated by a hyperbolic equation on an interval. One boundary condition has a nonclassical form. Additional data for solving the inverse problem are the values of the solution of the forward problem with a known fixed value of the spatial argument. In the inverse problem, it is required to determine the function in the nonclassical boundary condition and a functional factor on the right-hand side of the equation. Uniqueness and existence theorems for the inverse problem are proved. For the forward problem, conditions for unique solvability are established in a form that simplifies the analysis of the inverse problem. For the numerical solution of the inverse problem, an algorithm is proposed for the stage-by-stage separate reconstruction of the sought-for functions using the method of successive approximations for integral equations.

Key words: iterative algorithm, equation for vibrations, inverse problem.

UDC: 519.633.6

Received: 05.08.2022
Revised: 23.10.2022
Accepted: 02.02.2023

DOI: 10.31857/S0044466923050046


 English version:
Computational Mathematics and Mathematical Physics, 2023, 63:5, 808–820

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© Steklov Math. Inst. of RAS, 2026