Mixed Finite Elements
Mostrando 1-12 de 20 artigos, teses e dissertações.
-
1. Prediction of Modal Damping of FRP-Honeycomb Sandwich Panels with Arbitrary Geometries
Abstract In this work, the modal characteristics, including modal damping, of FRP composite skin, honeycomb core sandwich panels with arbitrary geometries are computed using a mixed finite element-meshless method. By using the meshless node distribution scheme in conjunction with the lagrangian quadrilateral interpolating functions, the continuity of inter-e
Lat. Am. j. solids struct.. Publicado em: 2017-01
-
2. Multi-model finite element scheme for static and free vibration analyses of composite laminated beams
Abstract A transition element is developed for the local global analysis of laminated composite beams. It bridges one part of the domain modelled with a higher order theory and other with a 2D mixed layerwise theory (LWT) used at critical zone of the domain. The use of developed transition element makes the analysis for interlaminar stresses possible with si
Lat. Am. j. solids struct.. Publicado em: 2015-11
-
3. Three-dimensional compatible finite element stress analysis of spinning two-directional FGM annular plates and disks with load and elastic foundation non-uniformities
Three-dimensional bending and stress analyses of the rotating two-directional functionally graded annular/circular plates or disks have not been accomplished so far. This task is performed in the present paper, employing a finite element formulation with a C¹-continuity. Therefore, both transversely graded and radiallygraded plates may be analyzed as specia
Lat. Am. j. solids struct.. Publicado em: 2013-09
-
4. Integração de sistemas rotor-mancais hidrodinâmicos-estrutura de suporte para resolução numérica / Integration of rotor-hydrodynamic bearings-support structure systems for numerical resolution
The Rotordynamics occupies a prominent position in the design of machines and structures, due to the wide application of rotating machinery and the importance of the knowledgment of its operation for purposes of optimization and design for cost reduction, quality improvement and increased component life cycle. These machines and their components have peculia
Publicado em: 2010
-
5. Stress hybrid and hybrid-mixed finite elements with nodal enrichment / Elementos finitos híbridos e híbrido-mistos de tensão com enriquecimento nodal
Neste trabalho, a técnica de enriquecimento da partição da unidade é estendida e adaptada para duas formulações não-convencionais para a elasticidade plana: a formulação híbrida de tensão (FHT) e a formulação híbrido-mista de tensão (FHMT). Estas formulações são ditas não-convencionais, pois não recorrem a princípios variacionais clássi
Publicado em: 2009
-
6. Central schemes for porous media flows
We are concerned with central differencing schemes for solving scalar hyperbolic conservation laws arising in the simulation of multiphase flows in heterogeneous porous media. We compare the Kurganov-Tadmor (KT) [3] semi-discrete central scheme with the Nessyahu-Tadmor (NT) [27] central scheme. The KT scheme uses more precise information about the local spee
Computational & Applied Mathematics. Publicado em: 2009
-
7. Complex response of a rotor-bearings-foundation system / Resposta complexa de um sistema rotor-mancais-fundação
A rotating system, as it spins, can perform a whirling at the same direction (forward whirl) or at the opposite direction (backward whirl). These two whirling modes can define the rotor s vibration behavior. The directional formulation is used in modal analysis to represent the whirling modes, so it can be possible to obtain the forward and backward response
Publicado em: 2009
-
8. A new algorithm, of course parallelization, for the calculation of equivalent permeabilities in reservoirs / Um novo algoritmo, naturalmente paralelizável, para o cálculo de permeabilidades equivalentes em reservatórios
A new numerical method is proposed for the permeabilities upscaling take into consideration periodic boundary conditions. This method combines domain decomposition with mixed finite elements in discretization of the local problem of pressure-velocity necessary to meet the equivalent permeabilities.
Publicado em: 2008
-
9. Ferramentas computacionais para a anÃlise de dutos com defeitos de corrosÃo
Pipelines are one of the safest means for transport of petroleum and gas, and the one with the smallest risk to the environment. They also possess high efficiency and productivity. In spite of their exceptional capabilities, they are also a great source of concern of the petroleum companies, since they can be subjected to several types defects, in particular
Publicado em: 2008
-
10. Avaliação numérica de reforço de grupo de estacas pela introdução de estacas adicionais
A review of the evolution of the use of piled raft, the differences of this foundation type with the conventional pile groups and as it these conception is important to evaluate the damage in a foundation. The main damages happened in the foundations are presented and some cases moderated in the literature on reinforcement of foundations, forecast of bearing
Publicado em: 2008
-
11. ELEMENTOS FINITOS ENRIQUECIDOS PARA FLAMBAGEM E VIBRAÇÃO DE PLACAS / ENRICHED FINITE ELEMENTS FOR BUCKLING AND VIBRATION OF SHELLS
The focus of the present work is to developand evaluate enriched elements used to obtain critical loads, frequencies of vibration and respective modes for two-dimensional structural components (rectangular plates in bending under inplane compressive loading). The Rayleigh-Ritz approximation method has been employed, directed to the use of conventional finite
Publicado em: 2007
-
12. Computational modeling and simulation of three-phase flows in heterogeneous petroleum reservoirs / Modelagem e simulação computacional de escoamentos trifásicos em reservatórios de petróleo heterogêneos
Neste trabalho é apresentado um novo método acurado com passo de tempo fracionário, baseado em uma técnica de decomposição de operadores, para a solução numérica de um sistema governante de equações diferenciais parciais que modela escoamento trifásico água-gás-óleo imiscível em reservatórios de petróleo heterogêneos no qual os efeitos de
Publicado em: 2007