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JOURNALS // Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy // Archive

Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2023 Volume 10, Issue 2, Pages 334–343 (Mi vspua247)

MECHANICS

Natural vibrations of a cylindrical shell with the end cap. II. Analysis of the spectrum

G. A. Nesterchuk, A. L. Smirnov, S. B. Filippov

St Petersburg State University, 7-9, Universitetskaya nab., St Petersburg, 199034, Russian Federation

Abstract: Using numerical and asymptotic methods, the lowest natural frequencies and vibration modes of a structure consisting of a closed circular cylindrical shell with an end cap attached to it, having the shape of a shallow spherical segment, are studied in the paper. Three types of natural vibrations of the structure are described. Eigenfrequencies and modes of vibrations of the first type, close to the frequencies and modes of vibrations of a shallow spherical shell, were studied in previous works. In this paper, we study the forms and frequencies of the second type of vibrations (cylindrical shell) and the third type (cantilever beam with the load). An optimization problem is solved to determine the values of the structure parameters, the relative thickness of its elements and the curvature of the end cap, at which the minimum value of the natural frequency is maximum. A comparison of the asymptotic and numerical results reveals their good agreement.

Keywords: joint thin shells, free vibrations, asymptotic methods, optimization.

UDC: 539.3, 534.1

MSC: 74H45, 74K25

Received: 21.01.2023
Revised: 21.01.2023
Accepted: 25.01.2023

DOI: 10.21638/spbu01.2023.213


 English version:
Vestnik St. Petersburg University, Mathematics, 2023, 10:2, 334–343


© Steklov Math. Inst. of RAS, 2024