Experimental verification of mathematical model of forced oscillations of an open thin-walled shell with a small attached mass and rigidly clamped edges

Trudy MAI ◽  
2019 ◽  
pp. 4-4
Author(s):  
Artem Dobryshkin ◽  
Oleg Sysoev ◽  
Evgeny Sysoev
2019 ◽  
Vol 945 ◽  
pp. 885-892 ◽  
Author(s):  
O.E. Sysoev ◽  
A.Y. Dobryshkin ◽  
Nyein Sit Naing ◽  
A.V. Baenkhaev

The operation of a structure of thin-walled open cylindrical shells with high economic efficiency is associated with the phenomenon of oscillations and resonance from the effects of cyclic loads and systems of attached masses. The oscillation processes of such structures are not sufficiently studied at present. The article describes a test bench for testing open thin-walled cylindrical shells hinged on the edges that carry a system of attached masses, and the results of experiments on the nature of a reduced-scale shell model are presented. The attached mass system represents metal cylinders of different masses arranged in a certain sequence on the shell body. The experimental dependence of the change in the frequency spectrum of the shell oscillations on the number, mass, and location of the system of attached masses is obtained. A mathematical model is developed for the behavior of an open thin-walled cylindrical shell with a system of attached masses, consistent with the experimental data for forced vibrations of the shell.


Author(s):  
Артем Юрьевич Добрышкин ◽  
Олег Евгеньевич Сысоев ◽  
Евгений Олегович Сысоев ◽  
Тхет Лин

В работе приводится уточненная математическая модель вынужденных колебаний разомкнутой оболочки с малой присоединенной массой при шарнирном опирании. Шарнирное опирание рассмотрено как наиболее часто используемое. Уравнения составлены в линейной постановке, решались асимптотическими методами, с помощью аппроксимации Паде. Проведены экспериментальные исследования, для этого изготовлены испытательный стенд, образцы, разработана программа экспериментов. Выполненное сравнение теоретических и экспериментальных данных составляет менее 5%, что говорит о высокой надежности уточненной математической модели. Полученные зависимости частоты колебаний оболочки и параметра волнообразования позволяют производить расчеты разомкнутый тонкостенных цилиндрических оболочек при параметре волнообразования больше 0,3, при проектировании таких конструкций. The paper presents a refined mathematical model of forced oscillations of an open shell with a small attached mass at a hinge support. Hinge support is considered as the most frequently used. The equations are composed in a linear formulation, solved by asymptotic methods, using Pade approximations. Experimental studies were carried out, a test stand and samples were made for this purpose, and a program of experiments was developed. Comparison of theoretical and experimental data it is less than 5%, which indicates a high reliability of the refined mathematical model. The obtained dependences of the shell oscillation frequency and the wave formation parameter make it possible to calculate the open-ended thin-walled cylindrical shells with a wave formation parameter greater than 0.3, when designing such structures.


1970 ◽  
Vol 37 (4) ◽  
pp. 895-900 ◽  
Author(s):  
H. J. Davies ◽  
G. A. Poland

The regimes of flow governing the dynamic behavior of a two-dimensional mathematical model of an edge-jet Hovercraft in heaving motion are described and the equations associated with such regimes derived. Both the free and forced-oscillation characteristics are studied. The nonlinear nature of the system manifests itself, in the case of the forced oscillations, as a shift in the dynamic equilibrium position resulting in a loss of mean hoverheight.


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