Discrete Elements Method
Mostrando 1-12 de 43 artigos, teses e dissertações.
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1. Numerical analysis of collapse modes in optimized design of alveolar Steel-concrete composite beams via genetic algorithms
Abstract The objective of this study is to present the formulation and applications of the optimization problem of steel-concrete composite alveolar beams. In addition to presenting the formulation, a comparative analysis of the predominant collapse modes is performed numerically via the finite element method. The optimization program was developed with the
REM, Int. Eng. J.. Publicado em: 2021-06
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2. Nonlinear Equilibrium and Stability Analysis of Axially Loaded Piles Under Bilateral Contact Constraints
AbstractThis paper presents a nonlinear stability analysis of piles under bilateral contact constraints imposed by a geological medium (soil or rock). To solve this contact problem, the paper proposes a general numerical methodology, based on the finite element method (FEM). In this context, a geometrically nonlinear beam-column element is used to model the
Lat. Am. j. solids struct.. Publicado em: 2015-04
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3. Dynamic Analysis and critical speed of rotating laminated conical shells with orthogonal stiffeners using generalized differential quadrature method
This paper presents effects of boundary conditions and axial loading on frequency characteristics of rotating laminated conical shells with meridional and circumferential stiffeners, i.e., stringers and rings, using Generalized Differential Quadrature Method (GDQM). Hamilton's principle is applied when the stiffeners are treated as discrete elements. The con
Lat. Am. j. solids struct.. Publicado em: 2013-03
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4. Os elementos finitos no estudo de eletromagnetismo utilizando os Software Gmsh/GetDP / The finite element method in electromagnetics study using the software Gmsh/GetDP
The aim of this master thesis is to study and develop two-dimensional and three-dimensional mathematical models, taking into account Maxwell s equations, the laws of material behavior and boundary conditions. Moreover, have discretization fields by finite element method using the Galerkin approach for electromagnetic analysis, and particularly problems of el
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/02/2012
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5. Finite element nonlinear analysis of high-rise unreinforced masonry building
A simple efficient algorithm based on compressive diagonal strength of unreinforced masonry walls is presented to determine capacity curve of unreinforced masonry building. The compressive strength is calculated based on a new close form solution. The new close form solution is determined based on predicted results using interface elements for modeling of mo
Lat. Am. j. solids struct.. Publicado em: 2012-10
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6. Metodologia para implementação de controle supervisório modular local em controladores lógicos programáveis / Methodology for implementation of supervisory control local modular in programmable logic control
Currently, manufacturing automation has assumed an increasingly important role within the industry and the problems of automated control systems have become increasingly complex. Thus, the traditional use of empirical methods heavily base on the experience of the programmer can lead to inappropriate or ineffective solutions. In this case, the Supervisory Con
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/07/2011
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7. Métodos Monte Carlo Quântico e Outer Valence Green s function aplicados na obtenção de energias de ionização de sistemas atômicos e moleculares e na construção e interpretação de diagramas de correlação / Quantum Monte Carlo and Outer Valence Green s function methods applied to obtain ionization energies of atomic and molecular systems and to construction and interpretation of correlation diagrams
The study was divided into 4 parts: Simple Ionization Energies: We evaluated the ability of MQC and OVGF methods in describing the values of the ionization energy of valence and core and tested the use of relaxed wave functions. The range of deviations obtained with the method of diffusion quantum Monte Carlo (MCQD), in relation to the experimental values, i
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/03/2011
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8. Acoustic beam modeling of ultrasonic transducers and arrays using the impulse response and the discrete representation methods
The impulse response of the velocity potential and the discrete representation methods were used in order to model the acoustic field radiated by ultrasonic transducers and arrays. The first method deals with the calculation of the exact impulse response, in which solutions are possible only for simple geometries, such as the circular piston. The second meth
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-12
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9. Self-Tuning Multimodal Piezoelectric Shunt Damping
Piezoelectric shunt damping is a well known structural vibration control technique that consists in connecting an electrical circuit to a piezoelectric transducer attached to the structure. In the case of a resonant shunt, the network consisting of an inductor-resistor network when combined with the capacitive nature of the piezoelectric transducer impedance
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-12
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10. Finite element simulation of viscous fingering in miscible displacements at high mobility-ratios
Numerical simulations of viscous fingering instabilities in miscible displacements at high mobility-ratios are presented. Anisotropic dispersion and monotonic viscosity profiles are considered. The coupled set of partial differential equations is approximated by the semi-discrete SUPG stabilized finite element formulation plus a discontinuity capturing techn
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-09
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11. A proposal for optimized analysis of transient currents in conductive materials. / Uma proposta para análise otimizada de correntes transitórias em materiais condutores.
In this work, a methodology is developed, based on the application of the moment method associated to a finite difference approximation, for time domain analysis of transient current distribution in conducting media. The computational procedure allows that long conductors with any cross section can be considered, approximated by filamentary elements. Thus, t
Publicado em: 2010
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12. SIMULAÇÃO NUMÉRICA DE PROBLEMAS DE ACOPLAMENTO FLUIDOMECÂNICO EM MEIOS POROSOS UTILIZANDO O MÉTODO DOS ELEMENTOS DISCRETOS / NUMERICAL ANALYSIS OF FLUID MECHANICAL COUPLING IN POROUS MEDIA USING THE DISCRETE ELEMENT METHOD
Esta pesquisa é motivada, principalmente, por problemas da geomecânica do petróleo como produção de sólidos em poços produtores e dano mecânico de formação. Produção de sólidos é o fenômeno onde partículas sólidas são produzidas juntamente com os fluidos de um reservatório de formação geralmente pouco ou não consolidada, podendo também
Publicado em: 2010