Mecánica Aplicada

URI permanente para esta comunidad

https://hdl.handle.net/10784/1348

The aim of the group is to research and develop methods for the realistic simulation of physical phenomena through the mathematical modelling of these phenomena and its solution by using analytical, numerical and symbolic methods.

Líneas de investigación: Dinámica de Fluidos Computacional; Ingeniería Sísmica; Mecánica Computacional; Mecánica Experimental; Optimización Estructural.
Código Minciencias: COL0053099.
Categoría 2019: A1.
Escuela: Ingeniería.
Departamento académico: Ingeniería Mecánica.
Coordinadora: Juan Carlos Botero Palacios.
Correo electrónico: jcbotero@eafit.edu.co

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Mostrando 1 - 20 de 140

Fixed Grid Finite Element Analysis in Evolutionary Structural Optimisation
(EMERALD GROUP PUBLISHING LIMITED, 2000-02-01) GARCIA, MANUEL JULIO; Mecánica Aplicada
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
Shape Optimisation of Continuum Structures via Evolutionary Strategies using Fixed Grid Finite Element Method
(SPRINGER, 2004-01-01) GARCIA, MANUEL JULIO; Mecánica Aplicada
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.
Principal component analysis -PCA- and delone triangulations for PL approximation C-1-continuous 1-manifolds in R-N
(ACTA PRESS, 2004-01-01) Ruiz, OE; Cadavid, CA; Garcia, MJ; Martinod, R; Ruiz, OE; Cadavid, CA; Garcia, MJ; Martinod, R; Universidad EAFIT. Departamento de Ingeniería Mecánica; Mecánica Aplicada
A Method is presented which combines statistical (Principal Component Analysis) and deterministic (Voronoi-Delone) methods to find Piecewise Linear approximations of curves C-i(u) in R-3 sampled with statistical noise. If the curves are self-intersecting, there are a finite number of points in which they are not 1-manifolds. Otherwise, they are 1-manifolds in all extents. The combination presented, of PCA and V-D methods, allows the recovery of 1-manifold approximations for C-i(u) for self-intersecting quasi-planar and non self-intersecting curves. In the later case the PCA alone succeeds in finding 1-manifold PL approximations for them. The algorithm implemented finds applications in contour and shape reconstruction from noisy data, subject to sampling errors or blockage.
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
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.
Lecture notes in numerical analysis
(Universidad EAFIT, 2006-02-01) GARCIA, MANUEL JULIO; Mecánica Aplicada
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.
The Global Lambda Visualization Facility: An International Ultra-High-Definition Wide-Area Visualization Collaboratory.
(Elsevier, 2006-10-01) GARCIA, MANUEL JULIO; Mecánica Aplicada
Multi-modal interface for fluid dynamics simulations using 3-D localized sound
(SPRINGER, 2007-01-01) Taylor, R.; Kazakevich, M.; Boulanger, P.; Garcia, M.; Bischof, W.F.; Taylor, R.; Kazakevich, M.; Boulanger, P.; Garcia, M.; Bischof, W.F.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Mecánica Aplicada
Multi-modal capabilities can be added to a simulation system in order to enhance data comprehension. We describe a system for adding sonification capabilities to a real-time computational fluid dynamics (CFD) simulator. Our system uses Max/MSP modules to add sonic properties to CFD solutions. The enhancements described in this paper allow users to locate sound sources in a 3-D environment using stereo auditory cues to identify data features. © Springer-Verlag Berlin Heidelberg 2007.
Multi-modal interface for a real-time CFD solver
(2007-01-01) Kasakevich, M.; Boulanger, P.; Bischof, W.F.; Garcia, M.; Kasakevich, M.; Boulanger, P.; Bischof, W.F.; Garcia, M.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Mecánica Aplicada
Advances in computer processing power and networking over the past few years have brought significant changes to the modeling and simulation of complex phenomena. Problems that formerly could only be tackled in batch mode, with their results visualized afterwards, can now be monitored whilst in progress using graphical means. In certain cases, it is even possible to alter parameters of the computation whilst it is running, depending on what the scientist perceives in the current visual output. This ability to monitor and change parameters of the computational process at any time and from anywhere is called computational steering. Combining this capability with advanced multi-modal tools to explore the data produced by these systems are key to our approach. In this paper, we present an advanced multi-modal interface where sonification and 3D visualization are used in a computational steering environment specialized to solve real-time Computational Fluid Dynamics (CFD) problems. More specifically, this paper describes how sonification of CFD data can be used to augment 3D visualization. © 2006 IEEE.
Low altitude wind simulation over Mount Saint Helens using NASA SRTM digital terrain model
(IEEE COMPUTER SOC, 2007-01-01) Garcia, M. J.; Boulanger, P.; Garcia, M. J.; Boulanger, P.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Mecánica Aplicada
On February 11, 2000, the Shuttle Radar Topography Mission (SRTM) was launched into space as part of one of the payload of the Shuttle Endeavor Using a new radar sweeping technique most of the Earth's surfaces was digitized in 3D in approximately 10 days. SRTM acquired enough data during its mission to obtain a near-global high-resolution database of the Earth's topography. This paper describe how this revolutionary data set can be used to simulate anywhere around the Earth low altitude wind conditions for various atmospheric conditions. More specifically, we will describe the various processing steps necessary to convert this high-resolution terrain model provided by the SRTM database into a Computational Fluid Dynamic (CFD) volumetric mesh that is compatible with an open source CFD solver called OpenFOAM running in parallel on large West-Grid supercomputers. This work is the result of a new virtual wind-tunnel under development at the University of Alberta. In the paper, we present wind flow over the Mount-Saint Helens in the United States for a simple wind flow boundary condition.
Low altitude wind simulation over mount saint helens using NASA SRTM digital terrain model
(2007-01-01) Garcia, M.J.; Boulanger, P.; Garcia, M.J.; Boulanger, P.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Mecánica Aplicada
On February 11, 2000, the Shuttle Radar Topography Mission (SRTM) was launched into space as part of one of the pay load of the Shuttle Endeavor. Using a new radar sweeping technique most of the Earth's surfaces was digitized in 3D in approximately 10 days. SRTM acquired enough data during its mission to obtain a near-global high-resolution database of the Earth's topography. This paper describe how this revolutionary data set can be used to simulate anywhere around the Earth low altitude wind conditions for various atmospheric conditions. More specifically, we will describe the various processing steps necessary to convert this high-resolution terrain model provided by the SRTM database into a Computational Fluid Dynamic (CFD) volumetric mesh that is compatible with an open source CFD solver called OpenFOAM running in parallel on large West-Grid supercomputers. This work is the result of a new virtual wind-tunnel under development at the University of Alberta. In the paper, we present wind flow over the MountSaint Helens in the United States for a simple wind flow boundary condition. © 2006 IEEE.
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.
Spring-Particle Model for Hypereslastic Cloth
(UNIV NAC COLOMBIA, FAC NAC MINAS, 2007-03-01) GARCIA, MANUEL JULIO; Mecánica Aplicada
Mampostería no reforzada
(2007-10-01) Jaramillo, Juan Diego; Mecánica Aplicada
Detección de zonas de penumbra y visibilidad a los Flujos Electromagnéticos en Campos Abiertos
(Facultad de Ingenierías del Instituto Tecnológico Metropolitano (ITM), 2007-12-01) GARCIA, MANUEL JULIO; Mecánica Aplicada
Identificación de Propiedades Dinámicas de Estructuras Considerando Efectos de Interacción Suelo-Estructura (Caso de Estudio)
(2008-01-01) RESTREPO, DORIAM LEIDIN; Mecánica Aplicada
Modeling and simulation of an Underwater Remotely Operated Vehicle (ROV) for surveillance and inspection of port facilities using CFD tools
(2008-01-01) Valencia, R.A.; Ramírez, J.A.; Gutiérrez, L.B.; García, M.J.; Valencia, R.A.; Ramírez, J.A.; Gutiérrez, L.B.; García, M.J.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Mecánica Aplicada
This article presents theoretical and computational studies with Computational Fluids Dynamics (CFD) tools of an Underwater Remotely Operated Vehicle (ROV), required to obtain reliable visual information, used for surveillance and maintenance of ship shells and underwater structures of Colombian port facilities. The thrust force is analyzed at the operational conditions by using CFD tools (FLUENT™, CFX™, COSMOSFLOW™) and the information about forces, torques and power of the vehicle's thrusters is obtained. The commercial propellers were modeled by using a reverse engineering process with a 3D scanner and Computer Aided Design (CAD) software (RAPIDFORM™). The results obtained with the CFD package allowed to evaluate several operating scenarios of the vehicle that are used for feedback purposes in the design process of the ROV before it be manufactured. Copyright © 2008 by ASME.

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