Repositorio Institucional Universidad EAFIT ::Examinando por Materia "Vehicles"

Examinando por Materia "Vehicles"

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Aerodynamic effects of manufacturing tolerances on a solar car
(Springer Science and Business Media Deutschland GmbH, 2017-01-01) Betancur, E.; Fragassa, C.; Coy, J.; Hincapie, S.; Osorio-Gómez, G.
In the case of solar vehicles, since the primary necessity is to optimise the energy efficiency during motion, many efforts are addressed by designers in searching the perfect aerodynamics. It means, in particular, the minimization of the drag force at cruising speeds and an elaborated vehicle’s Computer-Aided Design (CAD) are the principal result of this activity. Despite, these efforts can be nullified by geometrical tolerances emerging from manufacturing. In this paper, the effects of tolerances introduced by composite manufacturing processes are investigated combining 3D scanning technology and Computational Fluid Dynamics (CFD). After the solar car manufacturing, a reverse engineering process is executed with the aim to scan the vehicle’s body and compare it to the initial theoretical design. Geometric deviations are found and their aerodynamic consequences are evaluated in terms of aerodynamic losses. © Springer International Publishing AG 2017.
Análisis de la implementación de una metodología de diseño en una plataforma PLM por medio del desarrollo de un concepto de vehículo agrícola multipropósito
(Universidad EAFIT, 2011) Gaviria Mejía, Pablo; Hernández Álvarez, Alejandro; Sierra Zuluaga, Luis Fernando
Estudio de prefactibilidad de una línea de puertas para vehículos Renault en la planta de SOFASA Envigado
(Universidad EAFIT, 2006) Escobar Naranjo, Juan Camilo; Ocampo Restrepo, Juan Carlos; Aguilar, Carlos Andrés
Estudio de prefactibilidad para el establecimiento de un concesionario en la ciudad de Medellín dedicado a la venta de vehículos nuevos
(Universidad EAFIT, 2023) Mejía Correa, Mariana; Salazar Gómez, Francisco Javier; Uribe de Correa, Beatriz Amparo
The object of this prefeasibility study is defined as the determination of the viability of establishing a car dealership to sell new cars in the city of Medellín and how attractive it might seem to potential investors. This work is based on the observations made in this specific market niche of new combustion vehicles and the growing potential which can be evidence in the sales for this specific geography. By the means of different methodologies, such as the ones defined by the Danish Energy Agency and different authors found in academic data bases, the workplan is built, which establishes the evaluation of financial, regulatory, economic, administrative, technical, and environmental factors in order to determine if the project is promising within the specific context in which it´s proposed. The defined investigation is carried through the search of secondary information from trustworthy sources by employing media such as databases, academic publications, newspapers, economic reports, and current regulations which will allow the author to build a tailor-made model reflecting the specific context and that will present relevant results. Lastly, and employing all the gathered and analyzed information, the viability of the project is determined.
A fractional Fourier transform-based method to detect impacts between the bogie and the car body of a railway vehicle: A data-driven approach
(SAGE PUBLICATIONS LTD, 2018-01-01) Gutierrez-Carvajal, R. E.; Betancur, German R.; Castaneda, Leonel F.; Zajac, G.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Estudios en Mantenimiento (GEMI)
Structural railway transport elements are typically designed to work for at least 30 years without undergoing major maintenance. However, real-life operational conditions present behaviors different to the model predicted during the initial design phase, which affects the lifetime of the elements in question. This is the case of first-generation railway vehicles which operates in the city of Medellín, Colombia, as the bolster beam presented cracks after 12 years of operation, possibly due to undesired impacts between the bogie and the pivot of the bolster beam. Monitoring vibrational signals would give some sort of an insight into impact phenomena; however, herein lies the problem, as they are difficult to identify using only vibration signals, occurring during time events that take place in a speed-varying system. In this article, the authors present a technique that automatically detects impacts using multiple in-between time/frequency representations, ranking them according to their capacity to discriminate between impact events. Our results show that the best representation for this data was the Fractional Cepstrum Transform at order 0.5 (auROC = 0.961), which outperformed the best pure domain descriptor by least 4%. © 2016, © IMechE 2016.
From functional prototypes to industrial products
(Springer-Verlag France, 2017-05-01) Hernández-Pérez, J.C.; Osorio-Gómez, G.; Mejía-Gutiérrez, R.; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
Nowadays, engineering programs with Problem Based Learning methodologies, develop functional prototypes for demonstration purposes. Most of these ideas, many of them promising, are left behind once the academic term is over. Only a slight percentage of them are followed by an industrialization process, which is not formalized and it is based on third-party experiences. Even if well-known product design methodologies include some methods and activities oriented to evolve the product along its life cycle, they are not suitable for academic projects or they leave out some aspects of the local context. This has been an unexploited area, with high potential as there is no transcendence with academic projects; especially after all the time, effort, and creativity employed into a potentially profitable idea. In this way, the authors propose a methodology intended to allow the transition from academic functional prototype to a product ready to be industrialized according to the capabilities of the local context. Emerging economies, where industrial capabilities may be limited. The development of the methodology has been applied in a case study of an individual electric vehicle. This vehicle was developed with students and researchers within the Design Engineering Research Group (GRID) and it is intended to transport the persons responsible to distribute mail, and packages internally in the University campus. The object of such a case is to study the feasibility to promote this vehicle from functional prototype to a product ready to be industrialized under local industrial constraints. © 2015, Springer-Verlag France.
Full scale fatigue test performed to the bolster beam of a railway vehicle
(Springer-Verlag France, 2018-02-01) Gutiérrez-Carvajal, R.E.; Betancur, G.R.; Barbosa, J.; Castañeda, L.F.; Zaja¸c, G.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Estudios en Mantenimiento (GEMI)
Many structural elements are exposed to conditions of load that are difficult to consider during the design stage, such as environment uncertainties, random impacts, overloads and inherent material idealization amongst others, hence, miss-estimating its life-time cycle. One way to test those designs is to construct a representative full-scale specimen and test it under the most critical load conditions in a controlled laboratory. Herein, we present a case of study of the fatigue test performed over a bolster beam redesigned in Universidad EAFIT belonging to a railway vehicle. The test was composed by three stages, each one testing a different load hypothesis. The bolster beam was instrumented at the most critical locations, following the results of a FEM analysis previously computed. As results, the most critical welds were identified and the total damage computed for an equivalent operation of eighteen-years, and also the behaviour of the specimen in presence of extreme longitudinal loads. © 2016, Springer-Verlag France.
Full scale fatigue test performed to the bolster beam of a railway vehicle
(Springer-Verlag France, 2018-02-01) Gutiérrez-Carvajal, R.E.; Betancur, G.R.; Barbosa, J.; Castañeda, L.F.; Zaja¸c, G.; Gutiérrez-Carvajal, R.E.; Betancur, G.R.; Barbosa, J.; Castañeda, L.F.; Zaja¸c, G.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Mecatrónica y Diseño de Máquinas
Many structural elements are exposed to conditions of load that are difficult to consider during the design stage, such as environment uncertainties, random impacts, overloads and inherent material idealization amongst others, hence, miss-estimating its life-time cycle. One way to test those designs is to construct a representative full-scale specimen and test it under the most critical load conditions in a controlled laboratory. Herein, we present a case of study of the fatigue test performed over a bolster beam redesigned in Universidad EAFIT belonging to a railway vehicle. The test was composed by three stages, each one testing a different load hypothesis. The bolster beam was instrumented at the most critical locations, following the results of a FEM analysis previously computed. As results, the most critical welds were identified and the total damage computed for an equivalent operation of eighteen-years, and also the behaviour of the specimen in presence of extreme longitudinal loads. © 2016, Springer-Verlag France.
A Mixed-Integer Linear Programming Model for a Selective Vehicle Routing Problem
(Springer Verlag, 2018-01-01) Posada A.; Rivera J.C.; Palacio J.D.; Posada A.; Rivera J.C.; Palacio J.D.; Universidad EAFIT. Departamento de Ciencias; Matemáticas y Aplicaciones
In this paper, we propose a new vehicle routing problem variant. The new problem is a type of selective vehicle routing model in which it is not necessary to visit all nodes, but to visit enough nodes in such a way that all clusters are visited and from which it is possible to cover all nodes. Here, a mixed-integer linear programming formulation (MILP) is proposed in order to model the problem. The MILP is tested by using adapted instances from the generalized vehicle routing problem (GVRP). The model is also tested on small size GVRP instances as a special case of our proposed model. The results allow to evaluate the impact of clusters configuration in solver efficacy. © 2018, Springer Nature Switzerland AG.
A Mixed-Integer Linear Programming Model for a Selective Vehicle Routing Problem
(Springer Verlag, 2018-01-01) Posada A.; Rivera J.C.; Palacio J.D.; Posada A.; Rivera J.C.; Palacio J.D.; Universidad EAFIT. Departamento de Ciencias; Modelado Matemático
In this paper, we propose a new vehicle routing problem variant. The new problem is a type of selective vehicle routing model in which it is not necessary to visit all nodes, but to visit enough nodes in such a way that all clusters are visited and from which it is possible to cover all nodes. Here, a mixed-integer linear programming formulation (MILP) is proposed in order to model the problem. The MILP is tested by using adapted instances from the generalized vehicle routing problem (GVRP). The model is also tested on small size GVRP instances as a special case of our proposed model. The results allow to evaluate the impact of clusters configuration in solver efficacy. © 2018, Springer Nature Switzerland AG.
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.
Modelo de negocio para la distribución del servicio de renting de vehículos en Medellín
(Universidad EAFIT, 2020) Robledo Perdomo, Esteban; Restrepo Díaz , David Alejandro; Uribe de Correa, Beatriz Amparo
The vehicle rental sector has grown considerably in Colombia as a comprehensive proposal that covers the needs of people, companies and society in the financial and environmental fields and in the field of mobility, among others. It is a global trend of consumption that consists of paying for the use of certain products and services regardless of the property on them, and it is on this characteristic that the potential for the development of rent is found in a country in which property over things have more relevance. In this sense, it is essential to create penetration strategies for the Colombian market, understand the characteristics of consumers, their attributes and expectations, and implement value proposals for their distribution that cover the needs for alternative mobilization to ownership of vehicles. This work presents the stages in which a business model was developed to implement a rental distribution channel in Medellín, which connects the demand and supply of vehicle leasing services and contributes to the development of the sector and the generation of value for people, companies and society.
Procedure to determine module distribution within a solar array to increase the net energy collection in a solar competition vehicle
(SPIE-INT SOC OPTICAL ENGINEERING, 2014-01-01) Suarez-Castaneda, Nicolas; Gil-Herrera, Ana; Barrera-Velásquez, J.; Osorio-Gomez, Gilberto; Mejia-Gutierrez, Ricardo
In solar vehicle competition, the available space for installation of the solar panel in the car is limited. In order to optimize space, it is difficult not to install solar modules in areas impacted by shadows, even if they cause reduction of efficiency in the overall photoelectric generation. Shadow patterns arise from the relative position of the sun to the earth, and the relative position of the vehicle towards both of them. Since vehicle, earth and sun are moving in semi-predictable patterns, computer simulations can cross and match data from such sources to forecast generation behavior. The outputs of such simulations are shadow patterns on the surface of the vehicle, indicating locations that are suitable or unsuitable to install solar cells. This paper will show the design procedure of the solar panel for a Challenger Class solar vehicle that participated in the World Solar Challenge 2013, intended to increase the net energy collection. The results obtained, illustrate how the employment of a computational tool can help in the acquisition of both qualitative and quantitative information, related to shadows position and their impact on energy collection. With data inputs such as vehicle geometry and its relative position towards the route, the tool was used to evaluate different possible configurations of solar panel module distribution and select the ones that are more convenient to the given scenario. Therefore, this analysis allows improving the solar panel design by considering important variables that were often overlooked. © 2014 SPIE.
Solar array design based on shadow analysis for increasing net energy collection in a competition vehicle
(SPIE, 2015-06-08) Osorio-Gómez, G.; Mejía-Gutiérrez, R.; Suárez-Castañeda, N.; Gil-Herrera, A.; Barrera-Velásquez, J.; Universidad EAFIT. Departamento de Ingeniería de Diseño; Ingeniería de Diseño (GRID)
Photovoltaic (PV) applications such as in the architectural, automotive, and aerospace industries face design contradictions because they are expected to produce a lot of energy but are constrained by available area, surface shape, incident irradiance, shadows, and other aspects that have a negative influence on the energy produced by the solar panel. Solar competition vehicles are some of these challenging PVapplications. The design of such solar arrays needs to consider efficiency evaluation in order to optimize space; it is difficult not to install solar modules in areas impacted by shadows. A design procedure for a solar array configuration based on shadow analysis for competition vehicles is presented. The principle is that shadows in moving objects can be simulated, since the vehicle, the earth and the sun are are moving in semipredictable patterns, thus net energy collection can be forecast. The case study presented is the solar array design of a vehicle that participated in the World Solar Challenge 2013. The obtained results illustrate how the employment of the procedure gives insights on important aspects to consider and also delivers qualitative and quantitative information for decision making. In addition, the experience in competition highlights some issues to be considered, modified, or improved in further vehicle designs. © 2015 Society of Photo-Optical Instrumentation Engineers.
Structural diagnosis of rail vehicles and method for redesign
(Polish Society of Technical Diagnostics, 2014-01-01) Aristizabal, M.; Barbosa, J.L.; Betancur, G.R.; Castañeda, L.F.; Zóltowski, B.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Estudios en Mantenimiento (GEMI)
Structures of rail vehicles are designed for a useful structural life of 30 years. However, structural problems which reduce the mechanical performance of the structure might appear due to normal operation conditions, in some cases, make it unsuitable for a safe operation. This document presents the structural diagnosis of a metro system and the method for the redesign of structural elements of rail vehicles that was derived from this diagnosis, so that the structural performance of both the element and the whole structure is improved. It is based on the European standards related with aluminium and railway applications, and considers the necessary aspects to produce a safe solution for the final design.
A study of the effect of the transition curve in the coupling elements between the carbody and the bogie
(INDERSCIENCE ENTERPRISES LTD, 2014-01-01) Martinod, Ronald M.; Betancur, German R.; Osorio, Jose F.; Castaneda, Leonel F.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Estudios en Mantenimiento (GEMI)
This work describes an analysis of the effect of the transition curves in the coupling elements between the carbody and the bogie, by means of recorded variables under commercial operation conditions of a railway vehicle. A set of field tests are developed and applied to the railway system as a basis to validate a numerical model. The dataset is obtained from a numerical model based on the multi-body systems theory using a transient method. The study focuses on the dynamic evaluation of the vehicle to determine the transversal dynamic effect generated by the circulation in the transition curve sections, especially in curves with short radius. The work includes a case study of a passenger railway, and it is used to identify aspects of the railway system that could be improved by the operators, such as inspection routines, rail track design and elements subjected to considerable loads. Copyright © 2014 Inderscience Enterprises Ltd.
Suspension and landing gear failures
(Elsevier Inc., 2015-01-01) Ossa, E.A.; Paniagua, M.; Universidad EAFIT. Departamento de Ingeniería de Producción; Materiales de Ingeniería
Failure of landing gears in aircrafts represents approximately a 10% of the total of failures reported for the aerospace industry. This chapter discusses the main causes of these failures, their prevention, and a complete analysis of three cases of failure of this kind of components. On the other hand, failures of suspension systems in vehicles represent approximately a 13% of the total of failures for the automotive industry. In this industry, it is a common practice to replace failed parts without any further investigation of the root causes of failure, which can make the amount of failures to be underestimated. This chapter will discuss the main types and causes of failures of suspension systems. One case of failure of this kind of components will be analyzed and discussed in detail. © 2016 Elsevier Ltd. All rights reserved.

Examinando por Materia "Vehicles"

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