Numerical and Experimental Dynamic Analyses of a Postbuckled Box Beam

Franzoni, Felipe; Almeida, Sérgio Frascino Müller de; Ferreira, Clóvis Augusto Eça

doi:10.2514/1.j054576

Cited by 4 publications

(2 citation statements)

References 17 publications

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“…A nonlinear model which accounts for nonlinear warping, bending-bending and torsion-bending couplings was used for the analysis. Franzoni et al [27] proposed a numerical approach, based on a nonlinear finite element model and an experimental modal analysis procedure, to estimate the dynamic behavior of a typical aeronautical aluminum box-beam structure liable to buckling. Augello et al [28] proposed an efficient Carrera Unified Formulation (CUF)-based method for the vibrations and buckling of thin-walled open cross-section beams, with complex geometries, under progressive compressive loads.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Finite Element Modelling and Vibration Analysis of Prestressed Layered Bending–Torsion Coupled Beams

Kashani

Hashemi

2022

Applied Mechanics

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Free vibration analysis of prestressed, homogenous, Fiber-Metal Laminated (FML) and composite beams subjected to axial force and end moment is revisited. Finite Element Method (FEM) and frequency-dependent Dynamic Finite Element (DFE) models are developed and presented. The frequency results are compared with those obtained from the conventional FEM (ANSYS, Canonsburg, PA, USA) as well as the Homogenization Method (HM). Unlike the FEM, the application of the DFE formulation leads to a nonlinear eigenvalue problem, which is solved to determine the system’s natural frequencies and modes. The governing differential equations of coupled flexural–torsional vibrations, resulting from the end moment, are developed using Euler–Bernoulli bending and St. Venant torsion beam theories and assuming linear harmonic motion and linearly elastic materials. Illustrative examples of prestressed layered, FML, and unidirectional composite beam configurations, exhibiting geometric bending-torsion coupling, are studied. The presented DFE and FEM results show excellent agreement with the homogenization method and ANSYS modeling results, with the DFE’s rates of convergence surpassing all. An investigation is also carried out to examine the effects of various combined axial loads and end moments on the stiffness and fundamental frequencies of the structure. An illustrative example, demonstrating the application of the presented methods to the buckling analysis of layered beams is also presented.

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Section: Introductionmentioning

confidence: 99%

Dynamic Finite Element Modelling and Vibration Analysis of Prestressed Layered Bending–Torsion Coupled Beams

Kashani

Hashemi

2022

Applied Mechanics

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“…A Figura 33 apresenta as variações das três primeiras frequências naturais da viga-caixão. Figura 33 -Frequências naturais em função do carregamento Fonte: adaptado de (94) Os resultados obtidos no modelo de elementos finitos desenvolvido no ANSYS ® apresentam comportamento bastante similar aos dispostos em (79), embora percam rigidez de forma um pouco mais lenta. Cabe lembrar que os modelos de elementos finitos não são idênticos, principalmente no que se refere à modelagem estrutural das juntas e da distribuição da massa discreta adicional, o que pode afetar de forma significativa as frequências naturais dos modos locais dos paineis.…”

Section: Descrição Do Problemaunclassified

Análise mecânica de compósitos laminados para turbinas eólicas offshore.

Almeida

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por traduzir seu vasto conhecimento e experiência em ideias simples e aplicáveis, ampliando os horizontes deste trabalho.Aos meus colegas do LMC (Laboratório de Mecânica Computacional), pelas discussões e colaboração ao longo deste ciclo: Gabriel Lapa, Celso Faccio e Guilherme Martins. À Petrobras, por meio da FUSP (Fundação de Apoio a Universidade de São Paulo), pelo apoio financeiro durante o trabalho (projeto 5900.0112605.19.9). RESUMO ALMEIDA, I. T. Análise mecânica de compósitos laminados para turbinas eólicas offshore. 2024. 130p. -

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Numerical and Experimental Analyses of Free and Forced Vibration of Thin-Walled Beams

Jrad

Mohri

Robin

et al. 2020

Int. J. Str. Stab. Dyn.

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The flexural–torsional vibration behavior of unrestrained and braced thin-walled beams is investigated by experimental and finite elements approaches. In the experimental part, tests in free and forced vibrations of thin walled beams with arbitrary sections are analyzed. By the help of an instrumental hammer test and a shaker machine, the natural frequencies and the response spectra of the beams are extracted in the range 1–400[Formula: see text]Hz. Beam displacements are measured by some accelerometer transducers. The behavior is also investigated by the finite element method. In mesh process, 3D beams are adopted and an additional DOF is affected to the warping. The model is implemented in a home-made model. The numerical and experimental results are compared to numerical simulations of a commercial code. Test results and numerical simulations of the present model agree well. The model seems to be accurate especially in the presence of higher vibration and coupled modes.

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Numerical and Experimental Dynamic Analyses of a Postbuckled Box Beam

Cited by 4 publications

References 17 publications

Dynamic Finite Element Modelling and Vibration Analysis of Prestressed Layered Bending–Torsion Coupled Beams

Dynamic Finite Element Modelling and Vibration Analysis of Prestressed Layered Bending–Torsion Coupled Beams

Análise mecânica de compósitos laminados para turbinas eólicas offshore.

Numerical and Experimental Analyses of Free and Forced Vibration of Thin-Walled Beams

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