Articulos

URI permanente para esta colección

https://hdl.handle.net/10784/1347

Examinar

Mostrando 1 - 20 de 121

Acoustic absorption coefficient of open-cell polyolefin-based foams
(ELSEVIER SCIENCE BV, 2014-04-15) Alvarez-Lainez, Monica; Angel Rodriguez-Perez, Miguel; Antonio de Saja, Jose; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
The acoustic absorption of open-cell polyolefin (PO) foams with densities between 23 and 64 kg/m3 has been measured and compared with that of open-cell polyurethane (PU) foams. Acoustic parameters related to the cellular structure, such as porosity, tortuosity and airflow resistivity, were also measured. PO foams show higher tortuosity and airflow resistivity than the PU open-cell foam; as a consequence, they show a higher absorption coefficient than PU open-cell foam in the frequency range between 1000 and 2000 Hz. We also modeled the acoustic behavior using the Biot-Allard theory with the Johnson approach, fitted using a genetic algorithm. The fits of the acoustic absorption coefficient as a function of frequency were reasonably consistent with the experimental results. © 2014 Elsevier B.V.
Acoustic displacement tetrahedra developed using the IET rules
(PERGAMON-ELSEVIER SCIENCE LTD, 2010-09-01) Correa, S.; Militello, C.; Recuero, M.; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
A four node, displacement based, acoustic element is developed. In order to avoid spurious rotational modes, a higher order stiffness is introduced. The higher order stiffness is developed from an incompatible strain field which computes element volume changes under nodal rotational displacements fields. The higher order strain satisfies the IET requirements, non affecting convergence. The higher order stiffness is modulated, element by element, with a factor. Thus, the displacement based formulation is capable of placing the spurious rotational modes over the range of physical compressional modes that can be accurately captured by the mesh. © 2010 Elsevier Ltd. All rights reserved.
AIR-MODELLING: A tool for gesture-based solid modelling in context during early design stages in AR environments
(ELSEVIER SCIENCE BV, 2015-01-01) Arroyave-Tobon, Santiago; Osorio-Gomez, Gilberto; Cardona-McCormick, Juan F.; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
Augmented reality (AR) technologies are just being used as interface in CAD tools allowing the user to perceive 3D models over a real environment. The influence of the use of AR in the conceptualization of products whose configuration, shape and dimensions depend mainly on the context remains unexplored. We aimed to prove that modelling in AR environments allows to use the context in real-time as an information input for making the iterative design process more efficient. In order to prove that, we developed a tool called AIR-MODELLING in which the designer is able to create virtual conceptual products by hand gestures meanwhile he/she is interacting directly with the real scenario. We conducted a test for comparing designers' performance using AIR-MODELLING and a traditional CAD system. We obtained an average reduction of 44% on the modeling time in 76% of the cases. We found that modelling in AR environments using the hands as interface allows the designer to quickly and efficiently conceptualize potential solutions using the spatial restrictions of the context as an information input in real-time. Additionally, modelling in a natural scale, directly over the real scene, prevents the designer from drawing his/her attention on dimensional details and allows him/her to focus on the product itself and its relation with the environment. © 2014 Elsevier B.V. All rights reserved.
Albatros Create: an interactive and generative tool for the design and 3D modeling of wind turbines with wavy leading edge
(Springer-Verlag France, 2020-01-01) Arias-Rosales A.; Osorio-Gómez G.; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
The shape of a wind turbine blade plays a critical role in the efficiency and robustness of energy production. In particular, the Wavy Leading Edge is a morphology that can be implemented in the blades to improve the operating range in unsteady conditions. The best performance is achieved by fine-tuning the blade geometry to the specific context. An aerodynamic exploration of these kinds of morphologies implies generating and evaluating design iterations. Accordingly, this work presents the development of the generative tool Albatros Create ®. Through interactive visualization, infographics, and centralized parameterization, its goal is to support the geometrical definition of the aerodynamic surfaces of horizontal-axis turbines with or without a wavy leading edge. New airfoil profiles can be created, and 3D models of the rotors designed can be automatically generated. The software was implemented in the design of two rotors which were then recreated in a benchmarking analysis with four other softwares. None of the four managed to generate the smooth surfaces in fully-editable models that were achieved with Albatros Create. This work aims at empowering the research community with a user-friendly tool for exploring rotor designs through virtual prototypes. This can help to integrate further the design, modeling, and optimization stages, addressing a wider audience and facilitating the implementation of Wavy Leading Edge morphologies. © 2020, Springer-Verlag France SAS, part of Springer Nature.
Análisis comparativo de políticas de diseño en Europa: Clasificación y visualización de estrategias
(Universidad de Caldas, 2017-01-01) González C.G.; López M.L.; Hernández M.C.; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
This analysis is part of the doctoral thesis project "The Design System in the Mediterranean Arc Euroregion: priorities for the characterization of a strategic model". Its purpose is to make a comparison between different design policies in Europe. This study started with a bibliographical review on the implementation of policies for strategic design in different countries and regions of Europe, as well as the analysis of competitiveness corporate ladder, competitiveness in design, innovation performance, etc. Because of these analyses, five countries and one region were selected: United Kingdom, Finland, Denmark, Norway, Estonia and Flanders. Information coding was conducted following the grounded theory research. Segments of analysis in the literature review, which were not preconceived prior to the initiation of this investigation, were identified and grouped into categories. Subsequently, matrix analyses and relationship networks or concept maps were used to visually demonstrate and compare the strategies that make up the design policies in each country/region. In addition, a relationship between competitiveness corporate ladder, growth of competitiveness and performance in innovation with the maps of the strategies could be established. The countries in the top 15 of the different rankings are those that have a higher chromatic brand because they have a higher number of strategies that promote design as a strategy. This comparative analysis can be used in different types of design policies of any territory in order to carry out an initial detection of existing strategies and to know the complexity of a specific design policy.
Are maximum bite forces of subjects 7 to 17 years of age related to malocclusion?
(Allen Press Inc., 2016-05-01) Roldán, S.I.; Restrepo, L.G.; Isaza, J.F.; Vélez, L.G.; Buschang, P.H.; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
Objective: To determine the effects of occlusion on maximum bite force of growing subjects. Materials and Methods: Incisor and first molar bite force of children and adolescents was evaluated. Four cohorts were measured annually for 3 years, starting at approximately 7, 9, 12, and 15 years of age, respectively. The initial sample included 182 females and 198 males; there were 130 subjects with normal occlusion, 111 with Class I malocclusion, and 139 with Class II malocclusion. Multilevel analyses were performed to model the growth changes and compare groups. Results: Maximum bite force increased significantly (P < .05) over time. Incisal forces peaked at 14.3 and 15.3 years of age for females and males, respectively. Maximum molar bite force peaked at 16 years for both males and females. Subjects with normal occlusion had significantly higher bite force than subjects with malocclusion. Maximum molar bite force exhibited a significant testing effect, with forces increasing 2.6 kg each year that the tests were repeated. Conclusions: Malocclusion has a detrimental effect on bite force. Changes in maximum bite force are also due to age, sex, and repeated testing.
Assembly planning with automated retrieval of assembly sequences from CAD model information
(EMERALD GROUP PUBLISHING LIMITED, 2012-01-01) Vigano, Roberto; Osorio Gomez, Gilberto; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
Purpose - The purpose of this paper is to define an approach to extract the liaison graph from a 3D CAD model and analyze a method to find at least a feasible assembly sequence for the product. The method could be useful to search the optimal sequence of assembling for a product, by comparing different sequences extracted in automatic mode from a 3D CAD model. Design/methodology/ approach - The method proposed analyzes the liaison graph extracted, in order to obtain the possible assembly sequences for the product under study. The extraction of the sequences is based on some attributes and parameters of the graph. Findings - By means of the method proposed it is possible to obtain in automatic mode the liaison graph of an assembly 3D CAD model. Moreover, the study of the graph obtained allows the definition of all the assembly sequences for the product. Finally, it is possible to analyse the sequences found to select the optimal sequence. Research limitations/implications - The major limitation of the approach is, actually, the great number of impossible sequences that are extracted. For this, a little intervention by the user is required. Practical implications - The application of the method allows the manufacturer to analyze and study the optimal assembly sequence without the direct use of a CAD system. The approach could be used at the early stage of the design process and by means of the database of the PDM/PLM systems. Originality/value - The approach proposed in the paper is an original method to extract a liaison graph from a 3D CAD model. The approach to extract the assembly sequences was compared with other methods and good results have been obtained. © Emerald Group Publishing Limited.
Automatic assembly sequence exploration without precedence definition
(Springer-Verlag France, 2013-01-01) Viganò, R.; Osorio Gómez, G.; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
Today the assembly sequence for the products is often carried out manually and its definition, typically, is very expensive, not guaranteeing optimal solutions. Coming up with an efficient assembly sequence is the essential step to improve process productivity and reduces the time and costs related to assembly machines and equipment. The issue related to the assembly sequence of a product depends on the total number of the its components. In particular, the number of the possible sequences can be obtained through the calculus of the factorial of the number of the product components. This work presents an automatic approach intended to define assembly sequences, based on the information regard the contacts and the interferences existing among the components, which is obtained by the assembly CAD model of the product. The level of the information required by this approach allows its implementation at early stages of design, as soon as the layout of the conceptual solution of the product is defined, independently by the method used to model the CAD assembly. The procedure proposed is focused to obtain a reduced number of assembly sequences, guaranteeing that there is at least one feasible assembly sequence among them. The procedure is oriented to iteratively identify independent and important subassemblies into the CAD assembly, then merge them to specific assembling nodes and generate sequences until the whole product is analyzed. After a brief review of current methodologies developed for assembly planning, in this paper, the automated procedure for assembly sequence generation is explained and applied on an example, obtaining feasible solutions. © 2012 Springer-Verlag.
Cas d’entreprise: La stratégie de croissance de comercializadora inducascos S.A] [Caso empresarial: A estratégia de crescimento de comercializadora inducascos S.A] [Caso empresarial: La estrategia de crecimiento de comercializadora inducascos S.A
(UNIV NACIONAL COLOMBIA, FAC CIENCIAS ECON, 2015-01-01) Velásquez-Montoya, M.; Robledo-Ardila, C.; Aristizábal-Uribe, E.; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
Comercializadora Inducascos S.A. started operations in 1998 in the city of Medellin-Colombia, after going through various difficulties such as financial failures, bankruptcy, limited infrastructure and a small number of employees. I nducascos is now catalogued as a medium enterprise for the local context, because of the great volume of manufactured and commercialized helmets. Part of its growth strategy is based on the diversity of its product portfolio and a commercial structure that enables the presence of the company’s products in every segment of the Colombian market. The growth in motorcycles sales in Colombia, due to the Chinese motorcycle boom since 2005 in the country, and the evolution of regulations concerning helmets use, have contributed to the exponential increase of sales volumes since its creation. This case describes the decision making process of the founder Ramiro Agudelo, which results in the and internationalitation strategy of the company. © 2015, Universidad Nacional de Colombia. All rights reserved.
Caso empresarial: La estrategia de crecimiento de Comercializadora Inducascos S.A.
(UNIV NACIONAL COLOMBIA, FAC CIENCIAS ECON, 2015-03-01) Velasquez, Marcela; Ardila J, Clemencia; ARISTIZABAL, ESTEBAN; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
Comercializadora Inducascos S.A. started operations in 1998 in the city of Medellín - Colombia, after going through various difficulties such as financial failures, bankruptcy, limited infrastructure and a small number of employees.
Characterization of Street Motorcycles for Development of a Hybridization Kit
(2020-11-02) Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
The analysis of mobility and pollution problems in Colombia has demonstrated that motorcycles are one of the most relevant contamination sources due to its high number of units in the market.
Collaborative Engineering Environments for Virtual Organisations
(Inderscience Enterprises Ltd., 2009-07-01) Mejía, Ricardo; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
Concept of a methodical process for the design of concentrating photovoltaic systems according to the context of use
(SPIE-INT SOC OPTICAL ENGINEERING, 2016-12-19) Gonzalez, David; Gómez, G.O.; Mejá-Gutiérrez, R.; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
Concentrating Photo Voltaic (CPV) systems maximize energy harvested from the sun with multi-junction solar cells of less area, reducing related implementation costs and reaching energy production thresholds up to 38,9 %.
Concordancia de las políticas de diseño con el marco de medición de la innovación del Manual de Oslo
(UNIV DIEGO PORTALES, 2018-01-01) Gómez-González C.; López M.L.; Hernández Monsalve M.C.; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
The purpose of this analysis is to establish a correspondence of design policies with the innovation measurement framework of the Oslo Manual (Organisation for Economic Co-operation and Development, OECD, 2005). Its importance lies in the fact that, although among academics and professionals design has been recognized as an engine of economic development at both micro and macro levels, it is not recognized by policymakers; which implies that innovation policies are an established academic field while design policies remain as an emerging one. This study includes the analysis of six design policies from European countries or regions, which led to the identification of different strategies that are influenced by infrastructure and institutional framework, design promotion, education systems, etc. Those strategies were categorized into twelve groups using methodologies of qualitative content analysis. Afterwards, a SWOT analysis developed for each of the twelve categories allowed to established a relation between them and the stakeholders of the Oslo Manual’s framework, in addition to the possibility to compare its implementation in each of the six-analyzed countries or regions. This graphical correlation showed that the existing links between the stakeholders of the system are the same links that exist between categories; therefore, the strategies of the different categories reinforce the links and ties between the different stakeholders of a system of Innovation from a country/region. This methodology can be adapted to analyze the design policy of any region. Replicate the results of this research would enable to standardize Latin American design policies in a global context by allowing them to be compared with systems from leading countries. © 2018 Universidad Diego Portales. All rights reserved.
Core processes, methods and e-services to support Virtual
(Inderscience Enterprises Ltd., 2003-08-01) Mejía, Ricardo; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
Correction to: Electric hybridization kit for modification of a manual transmission motorcycle (International Journal on Interactive Design and Manufacturing (IJIDeM), (2020), 10.1007/s12008-020-00649-w)
(Springer-Verlag France, 2020-01-01) Polanía-Restrepo S.; Jaramillo-González S.; Osorio-Gómez G.; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
Unfortunately, the corresponding author name was incorrectly spelled as ‘‘Simán Polanía-Restrepo’’ instead of ‘Simón Polania-Restrepo” in the original publication. © 2020, Springer-Verlag France SAS, part of Springer Nature.
Correlations between thermal and tensile behavior with friction coefficient in copolyamides 6/12
(Elsevier Ltd, 2017-02-15) Álvarez-Láinez, M.L.; Palacio R., J.A.; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
Although polyamide 6 (PA6) obtained from e-caprolactame (CL) is an engineering polymer with outstanding properties used in sliding applications, it exhibits low impact strength and high water absorption. Those are some of the reasons why copolymerization between CL and laurolactame (LL) is desired. In this work, copolymers from 0–100 wt% LL are prepared to evaluate crystallinity, melting behavior, tensile properties and those properties are correlated with coefficient of friction. Experimental results show that PA6 (0 wt%) crystallinity and elasticity modulus are higher than those obtained from 100 wt%LL (PA12), but friction coefficient in PA6 is lower than that of PA12. While with 60 wt% LL crystallinity and elastic modulus reach a minimum value, with 350% elongation and coefficient of friction they register a maximum value. Our results suggest that crystallinity and elastic modulus are opposed to coefficient of friction. The absence of hydrogen bonds produces irregularities in the chain, reducing the crystal formation; such behavior is a consequence of copolymerization. Our findings will help to customize copolyamide, modulate the response between mechanical properties and friction behavior, as well as evaluate when it is necessary to add lubricants in the copolymer formulations. © 2016 Elsevier B.V.
CORRESPONDENCE OF DESIGN POLICIES WITH THE INNOVATION MEASUREMENT FRAMEWORK OF THE OSLO MANUAL
(UNIV DIEGO PORTALES, 2018-01-01) Gomez-Gonzalez, Carolina; Lecuona Lopez, Manuel; Hernandez Monsalve, Maria Cristina; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
The purpose of this analysis is to establish a correspondence of design policies with the innovation measurement framework of the Oslo Manual (Organisation for Economic Co-operation and Development, OECD, 2005). Its importance lies in the fact that, although among academics and professionals design has been recognized as an engine of economic development at both micro and macro levels, it is not recognized by policymakers; which implies that innovation policies are an established academic field while design policies remain as an emerging one. This study includes the analysis of six design policies from European countries or regions, which led to the identification of different strategies that are influenced by infrastructure and institutional framework, design promotion, education systems, etc. Those strategies were categorized into twelve groups using methodologies of qualitative content analysis. Afterwards, a SWOT analysis developed for each of the twelve categories allowed to established a relation between them and the stakeholders of the Oslo Manual's framework, in addition to the possibility to compare its implementation in each of the six-analyzed countries or regions. This graphical correlation showed that the existing links between the stakeholders of the system are the same links that exist between categories; therefore, the strategies of the different categories reinforce the links and ties between the different stakeholders of a system of Innovation from a country/region. This methodology can be adapted to analyze the design policy of any region. Replicate the results of this research would enable to standardize Latin American design policies in a global context by allowing them to be compared with systems from leading countries.
Crowdsourcing Augmented Reality Environment (CARE) for aesthetic evaluation of products in conceptual stage
(ELSEVIER SCIENCE BV, 2018-08-01) Arbeláez J.C.; Osorio-Gómez G.; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
Decision-making activities affect to a larger extent the quality, cost, time and success of a product. However, there are fewer alternatives when it comes to supporting in aesthetic evaluation during the product design stages. Therefore, is proposed a Crowdsourcing Augmented Reality Environment (CARE) that use the user's mobile devices for getting the feedback from the evaluation of products using a Semantic Differential (SD) that consider the user's context-light interaction in real time. Finally, two products were evaluated using CARE vs. the real products under different lighting and surrounding conditions. Obtaining a similar measure of products aesthetic perception between CARE and the real product, with slight variations. Additionally, an evaluation pattern among users was recognizable in the same context with slight variations using different lighting setup, that was similarly recreated with CARE. © 2018 Elsevier B.V.
D+E: fundamentos, problemática y soluciones pedagógicas.
(2017-01-01) MAYA, JORGE HERNAN; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)

Examinar

Examinando Articulos por Título

Resultados por página

Opciones de ordenación