Listar por autor "Navarrina, Fermín"
Mostrando ítems 81-98 de 98
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Optimización topológica de estructuras: una formulación de mínimo peso con restricciones en tensión
Navarrina, Fermín; Muíños Pantín, Iago; Colominas, Ignasi; Casteleiro, Manuel (2002)[Resumen] La optimización de formas y dimensiones en ingeniería estructural se plantea habitualmente mediante formulaciones de mínimo peso con restricciones impuestas que limitan los valores admisibles de tensiones y ... -
Optimization of Offshore Steel Jackets: Review and Proposal of a New Formulation for Time-Dependent Constraints
Couceiro, Iván; París, José; Navarrina, Fermín; Guizán Roca, Raquel; Colominas, Ignasi (Springer, 2020)[Abstract:] In this work, a methodology for the optimization of offshore wind turbine substructures (jacket type) is presented. The use of a coupled model allows for capturing the full dynamic interaction between all the ... -
Parallel computing aided design of earthing systems for electrical substations in non homogeneous soil models
Gómez Calviño, Javier; Colominas, Ignasi; Navarrina, Fermín; Casteleiro, Manuel; Cela Espin, José María (IEEE Computer Society, 2000)[Abstract] An accurate design of grounding systems is essential to assure the safety of the persons, to protect the equipment and to avoid interruptions in the power supply. In order to attain these targets, the equivalent ... -
Parallel computing aided design of earthing systems for electrical substations in non-homogeneous soil models
Colominas, Ignasi; Gómez Calviño, Javier; Navarrina, Fermín; Casteleiro, Manuel; Cela Espin, José María (Nova Science, 2005)An accurate design of grounding systems is essential to assure the safety of the persons, to protect the equipment and to avoid interruptions in the power supply. In order to attain these targets, it is necessary to ... -
Petrov-Galerkin and Galerkin/Least Squares stabilized approaches for advectivediffusive transport problems
Camprubí Estebo, Natalia; Colominas, Ignasi; Navarrina, Fermín; Casteleiro, Manuel (Fundacja Zdrowia Publicznego "Vesalius", 2001)[Abstract] The Finite Element method with a Galerkin type weighting is a straight-forward weighted residual method that has been sucessfuly used in many engineering applications, specially in Solid Mechanics. However, this ... -
Un planteamiento generalizado para el problema de convención-difusión. Formulación numérica y aplicaciones
Gómez, Héctor; Colominas, Ignasi; Navarrina, Fermín; Casteleiro, Manuel (2005)Obtener una solución numérica precisa y estable de la ecuación de convección-difusi ón requiere un gran coste computacional en situaciones de convección dominante. Además, la formulación clásica del problema no es ... -
Prólogo [Ferroviaria '98: Congreso nacional de ingeniería ferroviaria]
Navarrina, Fermín (Universidade da Coruña, 1998) -
Resolución numérica de problemas de potencial en aplicaciones de ingeniería mediante métodos sin malla
Colominas, Ignasi; Chao López, Mar; Mosqueira Martínez, Gonzalo; Navarrina, Fermín; Casteleiro, Manuel (Sociedad Española de Métodos Numéricos en Ingeniería, 1999)[Resumen] El proceso de discretización del dominio y la consiguiente generación de una malla de elementos es el punto de partida, pero también una de las mayores dificultades, de la aplicación de los métodos de elementos ... -
Sobre el empleo de técnicas de mínimos cuadrados móviles en el desarrollo de métodos de alta resolución de volúmenes finitos en mallas no estructuradas. Aplicación a problemas de flujo comprensible
Cueto-Felgueroso Landeira, Luis; Colominas, Ignasi; Navarrina, Fermín; Casteleiro, Manuel (2005)En este artículo se propone la combinación de aproximaciones por mínimos cuadrados móviles y esquemas upwind de volúmenes finitos, aplicados a problemas de flujo compresible en mallas no estructuradas. La construcción ... -
¿Son fiables los métodos convencionales para el cálculo de redes de puesta a tierra?
Navarrina, Fermín; Colominas, Ignasi; Casteleiro, Manuel (2004)[Resumen] Para diseñar una toma de tierra es preciso calcular su resistencia equivalente y la distribución de potencial en la superficie del terreno durante una derivación de corriente [1, 2, 3]. Para elllo las normas sólo ... -
SPH approaches for free surface flow for engineering applications
Mosqueira Martínez, Gonzalo; Cueto-Felgueroso Landeira, Luis; Colominas, Ignasi; Navarrina, Fermín; Casteleiro, Manuel (2002)[Abstract] In this paper, we study different SPH formulations proposed to solve free surface problems. We center our attention in the corrections added to the SPH method in order to increase its accuracy and to improve its ... -
Stability analysis of BEM approximate solutions in grounding analysis
Gómez Calviño, Javier; Colominas, Ignasi; Navarrina, Fermín; Casteleiro, Manuel (Elsevier, 2001)[Abstract] In this paper we present a summary of the Boundary Element Method developed for the analysis of potential problems in the electrical engineering field. The numerical model proposed is shown as a general frame ... -
Stabilization of numerical formulations for convective-diffussive transport problems
Colominas, Ignasi; López Jato, Raquel; Figueroa Álvarez, Carlos Alberto; Navarrina, Fermín; Casteleiro, Manuel (The International Center of Numerical Methods in Engineering, 2000)[Abstract] Numerical simulation in Fluid Mechanics is an extremely difficult task, wich complexity increases exponentially as the velocity of the fluid becomes higher. In particular, it is know that serious troubles are ... -
Structural topology optimization with high spatial definition by using the overweight approach
Villalba Rama, Diego; París, José; Couceiro, Iván; Navarrina, Fermín (WIT Press, 2022)[Abstract:] The first formulation of topology optimization was proposed in the 1980s. Since then, many contributions have been presented with the purpose of improving its efficiency and expanding its field of application. ... -
Topology optimization of structures considering minimum weight and stress constraints by using the Overweight Approach
Villalba Rama, Diego; París, José; Couceiro, Iván; Colominas, Ignasi; Navarrina, Fermín (Elsevier, 2022)[Abstract:] In this paper, a new method for structural topology optimization considering minimum weight and local stress constraints is proposed. For this purpose, the Overweight Approach, an improvement of the so-called ... -
Topology optimization of structures: a minimum weight approach with stress constraints
Navarrina, Fermín; Muíños Pantín, Iago; Colominas, Ignasi; Casteleiro, Manuel (Elsevier, 2004)Sizing and shape structural optimization problems are normally stated in terms of a minimum weight approach with constraints that limit the maximum allowable stresses and displacements. However, topology structural ... -
Topology Optimization of Structures: a minimum weight FEM approach
Navarrina, Fermín; Muíños Pantín, Iago; Colominas, Ignasi; Casteleiro, Manuel (2002)[Resumen] En general, los ingenieros tratan de diseñar piezas de peso mínimo que sean capaces de resistir las solicitaciones máximas que se puedan producir durante la vida útil de la pieza. Sin embargo, las formulaciones ... -
Why do computer methods for grounding analysis produce anomalous results?
Navarrina, Fermín; Colominas, Ignasi; Casteleiro, Manuel (IEEE Power Engineering Society, 2003)[Abstract] Grounding systems are designed to guarantee personal security, protection of equipments and continuity of power supply. Hence, engineers must compute the equivalent resistance of the system and the potential ...