Repositorio Institucional Universidad EAFIT ::Examinando Artículos por Fecha de publicación

Ítem

Fixed Grid Finite Element Analysis in Evolutionary Structural Optimisation

(EMERALD GROUP PUBLISHING LIMITED, 2000-02-01) GARCIA, MANUEL JULIO; Mecánica Aplicada

Ítem

Evaluación de los Efectos Inerciales de Interacción Dinámica Suelo-Estructura para Edificaciones Ubicadas en Medellín

(Fondo Editorial Universidad EAFIT, 2004-01-01) BOTERO, JUAN CARLOS; Mecánica Aplicada

Ítem

Shape Optimisation of Continuum Structures via Evolutionary Strategies using Fixed Grid Finite Element Method

(SPRINGER, 2004-01-01) GARCIA, MANUEL JULIO; Mecánica Aplicada

Ítem

Shape optimisation of continuum structures via evolution strategies and fixed grid finite element analysis

(SPRINGER, 2004-01-01) Garcia, MJ; Gonzalez, CA; Mecánica Aplicada

Evolution strategies (ES) are very robust and general techniques for finding global optima in optimisation problems. As with all evolutionary algorithms, ES apply evolutionary operators and select the most fit from a set of possible solutions. Unlike genetic algorithms, ES do not use binary coding of individuals, working instead with real variables. Many recent studies have applied evolutionary algorithms to structural problems, particularly the optimisation of trusses. This paper focuses on shape optimisation of continuum structures via ES. Stress analysis is accomplished by using the fixed grid finite element method, which reduces the computing time while keeping track of the boundary representation of the structure. This boundary is represented by b-spline functions, circles, and polylines, whose control points constitute the parameters that govern the shape of the structure. Evolutionary operations are applied to each set of variables until a global optimum is reached. Several numerical examples are presented to illustrate the performance of the method. Finally, structures with multiple load cases are considered along with examples illustrating the results obtained.

Ítem

Evaluación aproximada de la aceleración absoluta en sistemas de múltiples grados de libertad considerando la participación de n formas modales

(2005-07-01) Jaramillo, Juan Diego; Mecánica Aplicada

Ítem

Influence of the uncertainty in the soil-rock spectral ratios in the definition of uniform hazard spectra at surface level

(IMPERIAL COLLEGE PRESS, 2006-01-01) Jaramillo J.D.; Mecánica Aplicada

Based on traditionally accepted hypothesis and verified by existing data, an expression is derived to calculate response spectrum at the ground surface if the response spectrum at the basement rock is known. The fundamental assumptions are with regards to the form of variation of the exceedance rates of spectral accelerations in the basement rock, and based also on the usual (lognormal) distribution forms of the uncertainties associated with the spectral amplification function. The resulting approach multiplies the mean of the amplification function in order to consider in a rigorous way its uncertainty. © Imperial College Press.

Ítem

Lecture notes in numerical analysis

(Universidad EAFIT, 2006-02-01) GARCIA, MANUEL JULIO; Mecánica Aplicada

Ítem

Influence of the uncertainty in the soil-rock spectral ratios in the definition of uniform hazard spectra at surface level

(IMPERIAL COLLEGE PRESS, 2006-07-01) Jaramillo, Juan Diego; Mecánica Aplicada

Based on traditionally accepted hypothesis and verified by existing data, an expression is derived to calculate response spectrum at the ground surface if the response spectrum at the basement rock is known. The fundamental assumptions are with regards to the form of variation of the exceedance rates of spectral accelerations in the basement rock, and based also on the usual (lognormal) distribution forms of the uncertainties associated with the spectral amplification function. The resulting approach multiplies the mean of the amplification function in order to consider in a rigorous way its uncertainty. © Imperial College Press.

Ítem

The Global Lambda Visualization Facility: An International Ultra-High-Definition Wide-Area Visualization Collaboratory.

(Elsevier, 2006-10-01) GARCIA, MANUEL JULIO; Mecánica Aplicada

Ítem

Spring-particle model for hyperelastic cloth

(UNIV NAC COLOMBIA, FAC NAC MINAS, 2007-03-01) Garcia, Manuel; Gomez, Mario; Ruiz, Oscar; Boulanger, Pierre; Mecánica Aplicada

This article presents a computational model to simulate the deformation of hyperelastic fabrics. The model is based on a spring-particle approach and it simulates the interaction of a textile tissue with a forming body. The fabric is represented by rectangular meshes of springs. This fact enables the model to behave orthotropically and therefore it is possible to simulate the warp and weft properties. The constitutive relations preserve the natural hyperelastic capabilities of the cloth. In the model developed herein, initially the cloth lies in its relaxed un-deformed state. Then it is given an initial deformation that guarantees no contact nor intersection with the forming rigid body. Finally, the deformed cloth is realised, and moves iteratively towards an equilibrium location. The final equilibrium location is reached when the internal forces are balanced by the external contact forces caused by the rigid object. This is achieved when the stop criterion has been satisfied.