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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 28 for “"Finite elements method"”.
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Métodos variacionais em problemas de termoelasticidade acoplada
… to obtain numerical results with support of the finite elements method.
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Barragens de terra sobre solos "porosos": análise de soluções de drenagem na fundação
Steady flow simulations by the Finite Elements Method are made utilizing a tipical cross seccion of a homogeneous earth-dam resting on a geological profile with the "porous" soil as a upper layer and the transition soil-bedrock as a more pervious layer. Different types of foundation drainage …
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Análise de estabilidade elástica pelo método dos elementos finitos
… the elastic stability of structures, using the finite elements method. In the first part it is presented an overall view of the stability criteria, and the essential differences among them. Using the criteria of the stationary value of the potential energy we have modified the method of …
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Ambiente para geração de modelos de elementos finitos em microcomputadores
… models discretization, plane and espatial, into finite element meshes in microcomputers. This work comes to make a contribution in the popularization of finite elements method, allowing sofisticated resources of numeric and graphics processing for structural analysis to the small port user or …
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Simulação de falta no enrolamento de campo de geradores síncronos pelo método dos elementos finitos
… model. The simulation is performed by the finite elements method in the software Maxwell supported by its electrical machines modelling package RMXprt, both from Ansys property. In the study, some fault models are proposed, to observe the effect of those faults in the operational parameters …
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Patterns in an elastic bar
… Next, we use a combination of two numerical methods, namely the Finite Elements Method (FEM) to approximate the model and the Derivative Free Optimization (DFO) to find the location of the jump.
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Tapetes impermeabilizantes a montante de barragens sobre aluviões permeáveis
… seepage control on pervious dam foundations. The Finite Elements Method (FEM) was used for the verification of blanket dimensioning methods. Various simulations were undertaken via FEM with the use of two fictitious dams. The blanket dimensioning methods were verified with respect to leakage, …
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Efeitos térmicos em estruturas maciças de concreto
… linear analysis of heat transfer using the finite elements method on a bidimensional field. In order to calculated the thermal stress, concrete is supposed to be a linear elastic material, and conventional linear analysis with the finite element method is applied. The formulation of the …
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Análise de zeros atrasados em unidades offshore
… 13.8 kV electric generator was modeled, by using finite elements method, since this piece of equipment is the most important factor in the study under consideration. That model was added to the electrical system under study, and then several simulations were performed employing the software ATP …
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Avaliação da pressão de colapso de dutos submarinos com danos
… in deep waters. Numerical models based on finite elements method and small-scale buckle propagation tests in dented samples were performed. These models and experimental tests have taken into account different pipeline and dent geometries. Material tests were performed to predict mechanical …
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Physics-based modelling, simulation, placement and learning for musculo-skeletal animations.
… patches sketched on the character skin mesh. The method utilizes the physics of inflatable surfaces and produces meshes ready to be tetrahedralized, that is without compenetrations. A framework for the simulation of muscles, fascia and fat tissues based on the Finite Elements Method (FEM) is …
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Método dimensional óptimo de sistemas multicuerpo con restricciones dinámicas: aplicación al diseño de mecanismos planos
The thesis presents a method for the optimal dimensional synthesis of multibody systems with topological, geometric, position, kinematic and dynamic constraints. The method is based on the minimization of an elastic potential energy objective function whose design variables are natural coordinates …
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Isogeometric Approach to Optical Tomography
… image reconstruction scheme. The major method for reconstruction of the object is based on an iterative loop that constantly minimizes the difference between the predicted model of photon scattering with acquired images. Currently the most effective method of predicting the photon …
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Investigation of internal damping in carbon fiber and steel cables
… is identified by the half-power bandwidth' method and the 'logarithmic decrement' method. The results indicate that, typically, damping decreases as the length, tension and the number of turns of the tested cable increases. Also, temperature and air pressure contribute to the variation of …
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Design and development of new pressure sensors for aerodynamic applications
… mechanical and electrical behaviours by means of finite elements method simulations and by means of wind tunnel tests. During the design phase, the sensor figures of merit are considered and evaluated for specific aerodynamic applications. The aim of this work is the production of low cost …
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The effect of distance between hole and hole to the structural stability of subchondral bone in the microfracture surgery
… in the microfracture surgery. In this study, we finite element analysis tool(i.e., COMSOL) is using analyzed effect on structural stability subchondral bone in microfracture procedure. To construct a more general simplified model of the femoral condyles was determined from a micro-CT scan of the …
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Nuevas herramientas software para el diseño de dispositivos pasivos de microondas basadas en elementos finitos 3D y redes neuronales
… problem where different techniques and/or methods must be combined in order to achieve the desired results. This work is about efficiently obtaining those designs by using together: global optimization, artificial neural networks, segmentation, finite elements method, and information of the …
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Ultrasonic wave dispersion and attenuation as tools for mechanical characterization of construction materials [Dispersione e attenuazione dell'onda ultrasonica come strumenti per la caratterizzazione meccanica dei materiali da costruzione]
Questa tesi di dottorato indaga la dispersione e l’attenuazione delle onde ultrasoniche come strumenti quantitativi per la caratterizzazione meccanica dei materiali da costruzione. Sebbene le tecniche ultrasoniche siano ampiamente utilizzate nella pratica, la loro interpretazione si basa spesso su …
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Cálculo estructural de tuberías enterradas por el método de elementos finitos, con base en el informe técnico CEN/TR 1295-3
… in this thesis propose generalised use of the finite elements method for the structural calculations of buried pipes as a “common sizing method” in Europe. The constitutive equations used in the model are based on the pipe’s elastic behaviour and the soil’s elastoplastic behaviour, modelling …
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Recuperación de la capacidad mecánica en piezas de madera solicitadas a flexión en estructuras tradicionales operando por la cara superior mediante refuerzos y prótesis mecánicas
… solutions by means of the analysis of the finite elements method (FEM), using COSMOSWorks. This phase has served to orient the second experimental phase of verification. The second phase is oriented to group the test in laboratory of 45 different type and origin pieces: 15 pieces of great …
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