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Search Results: 1 - 10 of 111634 matches for " O; Cerrolaza "
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Modelo computacional de simulación para mecánica de biofluidos usando la ecuación generalizada de lattice boltzmann: un caso particular de evaluación en prótesis mecánica cardiaca
Pelliccioni,O; Cerrolaza,M; Suros,R;
Boletín Técnico , 2007,
Abstract: a 3d model for the numerical simulation of artificial aortic prostheses is presented, considering fluid-structure interaction. the method is based in the general lattice boltzmann equation under a multi-relaxation scheme. stream lines, velocities and shear stresses inside the biological fluid are reported and discussed. technical details of the algorithm are also described. as well, an algorithm for the lb mesh generation is presented and evaluated. numerical results of artificial heart valves in aortic position are reported here, showing the versatility of the proposed approach.
Modelo computacional de simulación para mecánica de biofluidos usando la ecuación generalizada de lattice boltzmann: un caso particular de evaluación en prótesis mecánica cardiaca Computational model of simulation for mechanics of biofluids using the generalized lattice boltzman method
O Pelliccioni,M Cerrolaza,R Suros
Boletín Técnico , 2007,
Abstract: Un modelo computacional tridimensional para la simulación de prótesis mecánicas de válvula aórtica que considera la interacción fluido-estructura es presentado; el método se fundamenta en la aplicación de la ecuación generalizada de lattice Boltzmann bajo un modelo de multi-relajación. Se presentan resultados gráficos de velocidades, líneas de corriente y esfuerzos de corte a lo largo del flujo por la arteria para un modelo mecánico de válvula de corazón. Se describen detalles tanto del algoritmo de cálculo como su desarrollo bajo técnicas de cómputo en paralelo. Un algoritmo para la creación de la retícula discreta de cálculo también es presentado. Esta aplicación es utilizada para estudiar los cambios del flujo de sangre producidos por la interacción dinámica con una prótesis mecánica de válvula aórtica colocada en la arteria. A 3D model for the numerical simulation of artificial aortic prostheses is presented, considering fluid-structure interaction. The method is based in the General Lattice Boltzmann equation under a multi-relaxation scheme. Stream lines, velocities and shear stresses inside the biological fluid are reported and discussed. Technical details of the algorithm are also described. As well, an algorithm for the LB mesh generation is presented and evaluated. Numerical results of artificial heart valves in aortic position are reported here, showing the versatility of the proposed approach.
Análisis bidimensional de la interacción fluido-estructura en válvulas mecánicas de corazón utilizando técnicas de células autómatas
PELLICCIONI,O.J; CERROLAZA,M.E; HERRERA,M;
Revista de la Facultad de Ingeniería Universidad Central de Venezuela , 2006,
Abstract: this work shows a computational approach to simulate blood flowing through an aortic mechanical heart valve by cellular automata theory. a lagrange fluid-structure coupling is considered in this approach and changes in the fluid?s properties by the opening/closing of the leaflets during heart cycle?s time steps. velocities and shear stresses profiles in blood?s flow when it passes through the mechanical device were studied and discussed. numeric results of systolic cardiac phase were obtained. qualitative streamline maps are showed, with similar results of in vitro tests published by lim et al. (1998).
Dise?o y fabricación de una celda de carga para mediciones fisiológicas en distracción alveolar
Carrero Toro,Wilmer A; Romero,; Cede?o,José Adolfo; Cerrolaza,Miguel; Navarro,Tania;
Acta Odontológica Venezolana , 2009,
Abstract: a key aspect involved in the mechanical design of alveolar distractor is the accurate evaluation of physiological loading for computer simulation. very few information and previous work are available about this subject. a stainless steel load cell having strain gauges has been developed and manufactured. this cell was attached to a splint, like those used in orthodontia. the load cell was calibrated and then an ?in vivo? test was carried out on a partially-edentulous patient. digital registers of load were obtained for three cases: tongue protrusion, lower lips retraction and a combination of both
Dise o y fabricación de una celda de carga para mediciones fisiológicas en distracción alveolar Design and manufacturing of a load-cell for physiological measuring in alveolar distraction
Wilmer A Carrero Toro,Romero,José Adolfo Cede?o,Miguel Cerrolaza
Acta Odontológica Venezolana , 2009,
Abstract: Un factor de vital importancia para el dise o mecánico de distractor osteogénico alveolar es el conocimiento de las cargas fisiológicas para la simulación computacional, existe muy poca información o trabajos previos sobre este tema. Para obtener estas cargas, ha sido desarrollada una celda de carga constituida de una lámina de acero inoxidable en voladizo instrumentada con galgas extensométricas, la cual ha sido empotrada en una férula como la usada en tratamientos de ortodoncias. Luego de calibrar la celda de cargas fisiológicas, se realizó un ensayo in vivo sobre un paciente parcialmente edéntulo del maxilar inferior, obteniéndose registros digitales de cargas para diferentes condiciones de protrusión de la lengua, retracción del labio inferior y la combinación de ambas A key aspect involved in the mechanical design of alveolar distractor is the accurate evaluation of physiological loading for computer simulation. Very few information and previous work are available about this subject. A stainless steel load cell having strain gauges has been developed and manufactured. This cell was attached to a splint, like those used in orthodontia. The load cell was calibrated and then an “in vivo” test was carried out on a partially-edentulous patient. Digital registers of load were obtained for three cases: tongue protrusion, lower lips retraction and a combination of both
Finite element analysis of the indentation test on rocks with microstructure
Jean Sulem,Miguel Cerrolaza
Physics , 2008,
Abstract: Strength parameters of rocks are currently determined from indentation tests. In this paper, a finite element analysis of this test is presented and scale effect is studied. The rock is modelled as an elasto-plastic medium with Cosserat microstructure and consequently possesses an internal length. The response of the indentation curve is studied for various values of the size of the indentor as compared to the internal length of the rock in order to assess the scale effect.
Un método de acople para mef - mec para análisis de interacción suelo - estructura
Rojas,Katherina; Lehmann,Lutz; Cerrolaza,Miguel;
Boletín Técnico , 2008,
Abstract: the finite element method and the boundary element method are the most used numerical tools for solid mechanics analysis. each one of these methods has advantages and drawbacks in different cases. fem is well suited for finite domains with inhomogeneous materials and non linear behaviour while bem offers advantages when dealing with infinite domains displaying homogeneous materials and linear behaviour. an iterative coupling of the finite element method and the boundary element method is presented. the domain of the problem is divided in two subdomains, where each subdomain is analyzed separately and only the interface information is exchanged between both subdomains. the assembly and solution of a general equation system is avoided, thus obtaining full advantage of the matrices characteristics, since the system of equations is symmetric in fem. numerical results compare well with other available numerical results.
Un método de acople para mef - mec para análisis de interacción suelo - estructura A fem-bem coupling method for soil - structure interaction analysis
Katherina Rojas,Lutz Lehmann,Miguel Cerrolaza
Boletín Técnico , 2008,
Abstract: El Método de los Elementos Finitos y el Método de los Elementos de Contorno son las herramientas numéricas más utilizadas para análisis en mecánica de sólidos. Cada uno de estos métodos tiene sus ventajas y desventajas en diferentes casos. El MEF es adecuado para análisis de dominios finitos con materiales no homogeneos y comportamiento no lineal, mientras que MEC ofrece ventajas en el análisis de dominios infinitos con materiales homogéneos y comportamiento lineal. En este trabajo se presenta un acople iterativo del método de los elementos finitos y el método de los elementos de contorno. El dominio del problema es dividido en dos subdominios, donde cada subdominio es analizado por separado y sólo la información en la interfase es comunicada entre los dos subdominios. El ensamble y análisis de un sistema de ecuaciones general es evitado, obteniéndose ventaja de las características de las matrices, ya que el sistema de ecuaciones en el método de los elementos finitos es simétrico.Los resultados numéricos obtenidos concuerdan satisfactoriamente con resultados obtenidos por otros autores. The Finite Element Method and the Boundary Element Method are the most used numerical tools for solid mechanics analysis. Each one of these methods has advantages and drawbacks in different cases. FEM is well suited for finite domains with inhomogeneous materials and non linear behaviour while BEM offers advantages when dealing with infinite domains displaying homogeneous materials and linear behaviour. An iterative coupling of the Finite Element Method and the Boundary Element Method is presented. The domain of the problem is divided in two subdomains, where each subdomain is analyzed separately and only the interface information is exchanged between both subdomains. The assembly and solution of a general equation system is avoided, thus obtaining full advantage of the matrices characteristics, since the system of equations is symmetric in FEM. Numerical results compare well with other available numerical results.
UN NUEVO METODO PARA LA SIMULACION DE LA ESTRUCTURA OSEA MEDIANTE LA VERSION P DE ELEMENTOS FINITOS
Müller-Karger,C. M; Cerrolaza,M;
Boletín Técnico , 2001,
Abstract: abstract in this work a three-dimensional model of bone, under physiological conditions, is developed with the purpose of a better understanding of the bone tissue. to accomplish the simulation it is necessary to develop a methodology for the extraction of geometry and material properties from computerize axial tomographies. an ascii format properties-array is created as input data for the finite element program in p-version. the stresses and displacements are calculated for a human tibia model as a heterogeneous body. the results and comparisons with the literature demonstrate that the developed methodology is adequate for bone simulation and overcomes some of the difficulties reported by other investigators
Localización de defectos en hueso cortical empleando el método de los elementos de contorno y algoritmos genéticos
Ojeda,David; Divo,Eduardo; Kassab,Alain; Cerrolaza,Miguel;
Boletín Técnico , 2008,
Abstract: an efficient solution for cavity detection in cortical bone, using a point load superposition technique employing the boundary element method is presented in this paper. two examples where the cavity is located using a tac is presented. results of cavity presence problems simulated using numerical experiments validate the approach in cortical bone with a single cavity.
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