Abstract
The results of finite element modeling and experimental evaluation of dynamic characteristics (vibration modes and frequencies) of the composite element of aircraft power plant structures are presented. The aim of the work is to develop effective design and technological schemes for thin-walled complex-geometry composite parts, taking into account the peculiarities of mechanical behavior of polymer composite materials to the fullest extent possible. A method for determining the parameters of natural oscillations of composite parts in a free state using a ping test is developed, which allows excluding the influence of kinematic boundary conditions and obtaining frequency characteristics that depend only on the local characteristics of the material which are primarily determined by the manufacturing technology. According to the results of measurements of the amplitude-frequency parameters of the dynamic response, spectrograms of damped oscillations are obtained the peak values of which correspond to the experimental evaluation of the natural frequencies of the composite part. Verification of the design model was carried out according to the results of the ping test and a method for assessing the quality of technological processes of manufacturing thin-walled carbon fiber structures was proposed.
Highlights
Задачи обеспечения прочности, долговечности и надёжности при динамических нагрузках являются важнейшими при проектировании и экспериментальной отработке новой авиационной техники и служат основой достижения высоких лётно-технических и ресурсных характеристик летательных аппаратов [1,2,3]
A method for determining the parameters of natural oscillations of composite parts in a free state using a ping test is developed, which allows excluding the influence of kinematic boundary conditions and obtaining frequency characteristics that depend only on the local characteristics of the material which are primarily determined by the manufacturing technology
According to the results of measurements of the amplitude-frequency parameters of the dynamic response, spectrograms of damped oscillations are obtained the peak values of which correspond to the experimental evaluation of the natural frequencies of the composite part
Summary
Модель композитного кольца и титановой детали создана с помощью трёхмерных гексаэдральных двадцатиузловых квадратичных элементов SOLID186. Динамический расчёт форм и частот колебаний проводился при закреплении разделителя жёстко по окружности справа. Титановый «носик» насажен на ПКМ и слева свободен. Способ решения – прямой, с помощью блока векторов методом Ланцоша (Block Lanczos). 2 содержит расчётные значения первых 10 собственных частот и соответствующие формы колебаний в разделителе потоков из ПКМ. Собственные частоты и соответствующие им формы колебаний в корпусе-обтекателе
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