Wyniki wyszukiwania - BazTech

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Numerical Modelling of Static Aeroelastic Deformations of Slender Wing in Aerodynamic Design

Bugała Pamela, Sznajder Janusz, Sieradzki Adam

Transactions on Aerospace Research

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2023

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Nr 4 (273)

52--70

EN

The article presents the validation of two methods for analyzing the aerodynamic properties of the aircraft wing concerning aeroelastic effects. The first method is based on low-cost computational models (Euler-Bernoulli Beam Model and Vortex Lattice Method [VLM]). Its primary objective is to estimate the wing’s deformation early in the design stages and during the automatic optimization process. The second one is a method that uses solutions of unsteady Navier-Stokes equations (URANS). This method suits early design, particularly for unconventional designs or flight conditions exceeding low-fidelity method limits. The coupling of the flow and structural models was done by Radial Basis Functions implemented as a user-defined module in the ANSYS Fluent solver. The structural model has variants for linear and nonlinear wing deformations. Features enhancing applicability for real-life applications, such as the definition of deformable and nondeformable mesh zones with smooth transition between them, have been included in this method. A rectangular wing of a high-altitude long-endurance (HALE) aeroplane, built based on the NACA 0012 profile, was used to validate both methods. The resulting deflections and twists of the wing have been compared with reference data for the linear and nonlinear variants of the model.

2

Badania dynamiczne trójwarstwowej tektury falistej

Cedrowska A., Marynowski K., Mania R.

Przegląd Papierniczy

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2009

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R. 65, nr 2

87-90

PL

W pracy przedstawiono wyniki badań dynamicznych prostokątnej ptyty zbudowanej z tektury falistej, w których został zastosowany wyprowadzony wcześniej kompozytowy model belkowy. Na drodze teoretycznej i doświadczalnej zostały wyznaczone najniższe częstotliwości drgań własnych płyty. Przeprowadzono porównanie wyników badań doświadczalnych i teoretycznych, także przy zastosowaniu metody elementów skończonych.

EN

In dynamic investigations of a rectangular plate made of double-faced corrugated board the composite beam model is used in this paper. In theoretical and experimental way the lowest natural frequency of the plate have been determined. The experimental results were compared with theoretical calculation and also with the MES method.

3

Odwzorowanie modelu bryłowego do modelu belkowego z masami skupionymi na przykładzie wału korbowego

Kopeć S.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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2005

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z. 29

205-210

PL

W referacie, na przykładzie wału korbowego przedstawiono procedurę odwzorowania przestrzennego modelu bryłowego do układu złożonego z elementów belkowych i mas skupionych. W celu dostrojenia parametrów modelu belkowego zastosowano metodę polegającą na dekompozycji, w której proces został podzielony na etap dostrajania macierzy sztywności i etap dostrajania macierzy mas.

EN

In paper is presented the process of the representation three-dimensional solid model as a set of beam and mass elements layout. To match properly the beam-mass element model to solid model, parameters describing the geometry and physical properties of the crankshaft must be analysed. To do this the two-stage decomposition method was presented. In first stage the stiffness matrix was updated. Selected parameters representing dimensions of the beam elements and their Young modulus were changing until assumed criteria was achived. Second stage rest on creating whole model of the crankshaft and updating mass matrix using numerical modal analysis for both models. The final compatibility criteria were accordance of the eigenvalues and eigenvectors for both models.