Spectral dynamic stiffness method for the flutter problem of combined plates
Author details
- Sevastopol State University, Sevastopol, Russian Federation
- Sevastopol State University, Sevastopol, Russian Federation
- Sevastopol State University, Sevastopol, Russian Federation
Abstract
At present time, the spectral dynamic stiffness method is being actively developed as an alternative to the finite element method for vibration and stability problems of composite structures from beams, rods, plates and shells. This approach, based on exact solutions of governing differential equations, makes it possible to more effectively study the problem in the medium and high frequency ranges, and gives analytical expressions for natural modes. It is proposed to use the advantages of this method to study the problems of dynamic stability and flutter of an orthotropic composite plate in a supersonic gas flow. Using the linear approximation of piston theory, solution of the problem is investigated according to the Galerkin method on the basis of the eigenforms of a composite plate in vacuum. According to this approach the boundary value problem is reduced to a homogeneous infinite linear algebraic system of equations with coefficients are depending from physical-mechanical and geometrical parameters of the problem. The frequency parameter is included in the system linearly, that allows us to reduce eigenproblem for infinite system to the problem of determining the eigenvalues and vectors of a matrix. The convergence of the Galerkin method depending on the number of basis functions is studied numerically. It is shown that the first 16 eigenforms provide the good convergence of the method. Examples of numerical implementation are given, obtained solution allow us to study the dependence of the critical velocity from the properties of the material and geometry of the combined plate.
Keywords
МЕТОД СПЕКТРАЛЬНОЙ ДИНАМИЧЕСКОЙ ЖЕСТКОСТИ В ЗАДАЧАХ ФЛАТТЕРА СОСТАВНЫХ ПЛАСТИН
В настоящее время метод спектральной динамической жесткости активно развивается как альтернатива методу конечных элементов для исследования задач колебания и устойчивости составных конструкций из балок, стержней, пластин и оболочек. Данный подход, основанный на точных решениях разрешающих дифференциальных уравнений, позволяет более эффективно исследовать задачу в среднем и высоком диапазоне частот, дает аналитические выражения для собственных форм колебаний. Предлагается использовать преимущества данного метода для исследования проблемы динамической устойчивости и флаттера ортотропной составной пластины в сверхзвуковом потоке газа. Используя приближение поршневой теории, решение краевой задачи ищется согласно методу Галеркина по базису из собственных форм составной пластины в вакууме, которые, в свою очередь, строятся на основе метода спектральной динамической жесткости. Следуя данному подходу, краевая задача сводится к однородной бесконечной системе линейных алгебраических уравнений, коэффициенты которой зависят от физико-механических и геометрических параметров. Частотный параметр задачи входит в систему линейно, что при редукции бесконечной системы позволяет свести ее исследование к проблеме определения собственных чисел и векторов. Численно исследована сходимость метода Галеркина в зависимости от количества базисных функций. Показано, что удержание в расчетах первых 16 собственных форм в качестве базисных функций оказывается достаточным для обеспечения сходимости метода. Приведены примеры численной реализации, на основе полученного решения проводились исследования зависимости критической скорости потери устойчивости от свойств материала составной пластины и ее геометрии.
Ключевые слова
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