Effective test benches for studying natural vibrations of open cylindrical shells and plates

DOI: 10.34759/trd-2020-113-01

Аuthors

Dobryshkin A. Y.^*, Sysoev O. E.^**, Sysoev E. O.^**

Komsomolsk-na-Amure State University, 27, Lenina str., Komsomolsk-on-Amur, 681013, Russia

*e-mail: wwwartem21@mail.ru
**e-mail: fks@knastu.ru

Abstract

A need for experimental test benches, with which one or several parameters can be measured with high accuracy, arises for conducting tests of thin-walled shells. One of the most significant factors is exclusion or minimization of measurement errors. The purpose of this work consists in identifying a new regularity able to eliminate or physically reduce the calculation error when determining numerical oscillations characteristics of the thin-walled open shells of various curvatures. It was confirmed in the course of the research that a significant number of factors affect the accuracy of certain characteristics of the oscillatory process. Description of all physical laws, affecting measurements accuracy while experimental set up, touches on a significant time period. Thus, on the assumption of the conducted study a technical device, named a test bench, was manufactured in the course of this work. Test benches allow significant measurement quality increase. A test bench for contactless study of natural and forced oscillations of open cylindrical shells was developed in the engineering structures laboratory of the Komsomolsk-on-Amur State University. This test bench is metallic and rigidly attached to the base. Its small size allows measuring numerical characteristics of thin-walled open shells vibrations with high fidelity while measuring their width, height and curvature, as well as mounting methods. The studies aimed at revealing effective devices improving measurements quality, were conducted for its creation.

The scope includes all thin-walled shells employed in aerospace technology, submarines and ground structures. In the course of shell structures operation accidents occur, sometimes with casualties. This circumstance necessitates improvement of technical and scientific aspects of calculation, as well as mathematical and physical models. Experiments setting and conducting for confirming and correcting the developed mathematical models is an integral part of these studies. Since human casualties take place while shells operation, the studies in this area should certainly be continued. Flights of spacecraft and other delivery vehicles, for which the shell is the only possible structural solution, make relevant the studies in the field of shells vibrations.

Keywords:

thin-walled cylindrical shell, test bench, free vibrations

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