Nonlinear Theories
Mostrando 1-12 de 40 artigos, teses e dissertações.
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1. Numerical formulation for nonlinear analysis of concrete and steel shells with deformable connections
Abstract A two-dimensional interface finite element capable of associating flat shell elements positioned one above the other was developed. The implemented interface element can physically simulate the contact between the flat shell elements and connect the reference planes of the shell elements above and below it. The formulation presented allows considera
REM, Int. Eng. J.. Publicado em: 2021-09
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2. Nonlinear numerical analysis of composite slabs with steel decking
Resumo O comportamento das lajes mistas é governado pelo cisalhamento longitudinal na interface entre o aço e o concreto, que é desenvolvido em lajes sob flexão simples. O método m-k e o método da interação parcial, utilizados no cálculo da resistência ao cisalhamento na interface aço-concreto de lajes mistas, são baseados em ensaios experimentai
Rev. IBRACON Estrut. Mater.. Publicado em: 11/11/2019
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3. An efficient general curvilinear coordinates finite element method for the linear dynamic study of thickness-independent shells
Abstract yyTo date, a large number of finite element methods have been developed to study the dynamics of shell structures. Most of them are generally based on the degenerated solid approach and other less in shell theories, but introducing, in this last case, some assumptions to analyze this problem: some of them refer to shallow shells (slightly curved she
Lat. Am. j. solids struct.. Publicado em: 27/06/2019
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4. A Unified Approach to the Timoshenko Geometric Stiffness Matrix Considering Higher-Order Terms in the Strain Tensor
Abstract Nonlinear analyses using an updated Lagrangian formulation considering the Euler-Bernoulli beam theory have been developed with consistency in the literature, with different geometric matrices depending on the nonlinear displacement parts considered in the strain tensor. When performing this type of analysis using the Timoshenko beam theory, in gene
Lat. Am. j. solids struct.. Publicado em: 25/04/2019
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5. Finite element model based on refined plate theories for laminated glass units
AbstractLaminated glass units exhibit complex response as a result of different mechanical behavior and properties of glass and polymer foil. We aim to develop a finite element model for elastic laminated glass plates based on the refined plate theory by Mau. For a geometrically nonlinear description of the behavior of units, each layer behaves according to
Lat. Am. j. solids struct.. Publicado em: 2015-06
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6. Three theories for reconciling the linearity of egocentric distance perception with distortion of shape on the ground plane
The focus here is on the paradoxical finding that whereas visually perceived egocentric distance is proportional to physical distance out to at least 20 m under full-cue viewing, there are large distortions of shape within the same range, reflecting a large anisotropy of depth and frontal extents on the ground plane. Three theories of visual space perception
Psychol. Neurosci.. Publicado em: 2014-12
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7. Static and dynamic analysis of reinforced concrete shells
The objective of this work is to provide a reliable numerical model using the finite element method (FEM) for the static and dynamic analysis of reinforced concrete (RC) shells. For this purpose two independently computer programs based on plasticity and viscoplasticity theories are developed. The well known degenerated shell element is used for the static a
Lat. Am. j. solids struct.. Publicado em: 2013-11
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8. Controlador nebuloso por modos deslizantes adaptativo
In this work, an Adaptive Sliding Neurofuzzy Controller was proposed and its parameters had been established and well characterized. In this way, some concepts of the theories of neurofuzzy networks, sliding mode control and adaptive control had been treated. The considered controller presents only three inference rules and a low computational effort. It was
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/08/2011
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9. Novas propostas para análise de estabilidade, controle e processamento de sinais no contexto de dinâmicas não-lineares / Contributions for stability analysis, control and signal processing in the context of nonlinear dynamics
A presente tese de doutoramento apresenta contribuições à análise de estabilidade, ao controle e ao processamento de sinais no contexto de sistemas dinâmicos não-lineares. No que se refere à análise de estabilidade, este trabalho apresenta um novo método para calcular o espectro de Lyapunov para soluções de sistemas dinâmicos a partir de cópias
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/08/2011
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10. Controle de atitude de satélites artificiais utilizando um processador digital de sinais / Attitude control of satellites using a digital signal processor
This work deals with the development and implementation of an attitude control system for an artificial satellite using a Digital Signal Processor (DSP). The dissertation presents a complete study of the attitude movement modeling and control for the continuous time systems case, considering the Linear Quadratic Regulator (LQR) and Linear Quadratic Gaussian
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/09/2010
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11. Cálculo de propriedades elétricas lineares, não-lineares e estruturais da molécula HOBr
Ab initio, also known as first principles, computational methods are highly esteemed because of the accuracy of the results produced and the fact that they are not built upon any empirical models, therefore considered reliable. Although, these positive remarks carry along a heavy computational effort, which increase very rapidly with the number of basis func
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/04/2010
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12. Nonadditive entropy and nonextensive statistical mechanics -an overview after 20 years
Statistical mechanics constitutes one of the pillars of contemporary physics. Recognized as such - together with mechanics (classical, quantum, relativistic), electromagnetism and thermodynamics -, it is one of the mandatory theories studied at virtually all the intermediate-and advanced-level courses of physics around the world. As it normally happens with
Brazilian Journal of Physics. Publicado em: 2009-08