Examinando por Materia "Calibration"
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Ítem Elaboración de plan de mantenimiento para fresadora MFG de 3 ejes del Laboratorio de Mecatrónica Universidad EAFIT(Universidad EAFIT, 2012) Sánchez Agredo, Alexander; Betancur Maya, John AlbertoÍtem Elaboración de plan de mantenimiento para torno EMCO 220 del Laboratorio de Mecatrónica Universidad EAFIT(Universidad EAFIT, 2012) Guerra Trespalacios, Gabriel Fernando; Betancur Maya, John AlbertoÍtem Kinematic identification of parallel mechanisms by a divide and conquer strategy(INSTICC-INST SYST TECHNOLOGIES INFORMATION CONTROL & COMMUNICATION, 2010-01-01) Durango S.; Externo - Escuela - Ingeniería; Ruiz O.; Restrepo-Giraldo J.; Achiche S.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAEThis paper presents a Divide and Conquer strategy to estimate the kinematic parameters of parallel symmetrical mechanisms. The Divide and Conquer kinematic identification is designed and performed independently for each leg of the mechanism. The estimation of the kinematic parameters is performed using the inverse calibration method. The identification poses are selected optimizing the observability of the kinematic parameters from a Jacobian identification matrix. With respect to traditional identification methods the main advantages of the proposed Divide and Conquer kinematic identification strategy are: (i) reduction of the kinematic identification computational costs, (ii) improvement of the numerical efficiency of the kinematic identification algorithm and, (iii) improvement of the kinematic identification results. The contributions of the paper are: (i) The formalization of the inverse calibration method as the Divide and Conquer strategy for the kinematic identification of parallel symmetrical mechanisms and, (ii) a new kinematic identification protocol based on the Divide and Conquer strategy. As an application of the proposed kinematic identification protocol the identification of a planar 5R symmetrical mechanism is simulated. The performance of the calibrated mechanism is evaluated by updating the kinematic model with the estimated parameters and developing simulations.Ítem Medición e inspección de piezas utilizando brazos portátiles de medición por coordenadas(Universidad EAFIT, 2011) Henao Agudelo, Ricardo; Orozco Parra, William; Rodríguez Arroyave, Carlos ArturoCon la cantidad de productos que demandan las empresas y con la constante competencia que existe en el mercado, las personas buscan productos económicos y de buena calidad, por esto es indispensable que las empresas sean muy eficientes y competitivas para poder subsistir en el mercado -- La tecnología avanza rápidamente, y cada día surgen más herramientas que facilitan el control de calidad en las líneas de producción de las compañías en general, entre ellos se encuentran los brazos portátiles de medición por coordenadas principal objeto de estudio de este proyecto, que están revolucionando el mundo de la ingeniería brindándole a las empresas una mayor capacidad de estudiar cada vez situaciones más complejas que por medios convencionales no se podrían realizar -- No muchas empresas en Colombia en el sector metalmecánico auto-partes recurren a la medición e inspección de las piezas conformadas que posteriormente se ensamblan y salen al mercado con posibles defectos de calidad -- La idea con este proyecto en el medio es reforzar la implementación de dicha herramienta desarrollando guías de uso apoyados en video y estándares o procedimientos para la verificación de dichos equipos, necesarios para la medición e inspección de piezas metalmecánicas, contribuyendo así con el crecimiento y competitividad de las compañías y del país y aportando al aseguramiento Metrológico nacionalÍtem Modelación del transporte de soluto en ríos de montaña; una mirada CFD aplicada(Universidad EAFIT, 2013) Vásquez Isaza, Juan David; Montoya Jaramillo, Luis JavierÍtem Modelos Unifactoriales de Tipos de Interés: Aplicación al Mercado Colombiano(Elsevier, 2008) Restrepo Tobón, D.A; Botero Ramírez, J.C.; Departamento de Finanzas, Universidad EAFIT, Colombia; Bolsa Nacional Agropecuaria de Colombia, Colombia; Economía y Finanzas; Finanzas; Grupo de Investigación Finanzas y BancaThis article is a first approach to implementing in the Colombian market the unifactorial interest rate models developed by Hull and White (1990) and by Black and Karasinski (1991) with constant volatility and reversion velocity parameters. The main findings from this research are 1) implementing both models using trinomial trees enables accurately replicating the forward structure of market interest rates; 2) the parallel movements of the installment structure of interest rates in Colombia explains most of their variability, thus, using unifactorial models such as the ones proponed herein is appropriate; 3) the volatility and reversion velocity mean parameters on the mean short-term interest rate must be estimated using time series econo-metric models; 4) future articles must broach the problems related to coverage using such types of models, to estimating volatility structures and surfaces, and to multifactorial model calibration.Ítem Optimizing performance in spark ignition engines with simulation metamodels(Springer-Verlag France, 2019-01-01) Zutta E.; Acosta D.; Diaz G.; Zutta E.; Acosta D.; Diaz G.; Universidad EAFIT. Departamento de Ingeniería de Procesos; Procesos Ambientales (GIPAB)This work develops a systematic methodology able to identify the desired work points, the metamodels were evaluated varying air–fuel ratio, ignition timing, compression ratio, and combustion duration using design of computer experiments and RSM. It provide the possibility to determine optimal control parameters, according to selected objectives and operating constraints. This methodology is able to automatically identify the optimal engine calibration with less computational effort. Only in this way, the reliability of an integrated metamodel/optimizer approach can be included in a general-purpose that is to identify the engine calibration that minimizes motor vehicle emissions according to European emission standards (European Union in Off J Eur Union 50, 2007). As long as it improves mean effective pressure and reduces exergy destruction due to heat transfer and combustion process. Since, in internal combustion engines, more than 30–40 % of fuel energy wastes through the exhaust and just 12–25 % of the fuel energy converts to useful work. So, researchers are motivated to recover the heat from the waste sources in engines using the ways which not only reduce the demand of fossil fuels, but also reduce the harmful greenhouse gases and help to energy saving (Hatami et al. in Neural Comput Appl 25(7–8):2079–2090, 2014). The advantages of this contribution include the ability to study a wide range of parametric space and to independently evaluate physical and chemical processes, and detailed in-cylinder information, which is normally not available or is inaccessible in experiments. The uncertainty of the information in this unexplored design region can be quantified. Finally, the problem of optimizing involves three optimization fronts, energetic, economic and ecological (Chica and Torres in Int J Interact Des Manuf 12(1):355–392, 2018). © 2019, Springer-Verlag France SAS, part of Springer Nature.Ítem Optimizing performance in spark ignition engines with simulation metamodels(Springer-Verlag France, 2019-01-01) Zutta E.; Acosta D.; Diaz G.; Universidad EAFIT. Departamento de Ingeniería de Procesos; Desarrollo y Diseño de ProcesosThis work develops a systematic methodology able to identify the desired work points, the metamodels were evaluated varying air–fuel ratio, ignition timing, compression ratio, and combustion duration using design of computer experiments and RSM. It provide the possibility to determine optimal control parameters, according to selected objectives and operating constraints. This methodology is able to automatically identify the optimal engine calibration with less computational effort. Only in this way, the reliability of an integrated metamodel/optimizer approach can be included in a general-purpose that is to identify the engine calibration that minimizes motor vehicle emissions according to European emission standards (European Union in Off J Eur Union 50, 2007). As long as it improves mean effective pressure and reduces exergy destruction due to heat transfer and combustion process. Since, in internal combustion engines, more than 30–40 % of fuel energy wastes through the exhaust and just 12–25 % of the fuel energy converts to useful work. So, researchers are motivated to recover the heat from the waste sources in engines using the ways which not only reduce the demand of fossil fuels, but also reduce the harmful greenhouse gases and help to energy saving (Hatami et al. in Neural Comput Appl 25(7–8):2079–2090, 2014). The advantages of this contribution include the ability to study a wide range of parametric space and to independently evaluate physical and chemical processes, and detailed in-cylinder information, which is normally not available or is inaccessible in experiments. The uncertainty of the information in this unexplored design region can be quantified. Finally, the problem of optimizing involves three optimization fronts, energetic, economic and ecological (Chica and Torres in Int J Interact Des Manuf 12(1):355–392, 2018). © 2019, Springer-Verlag France SAS, part of Springer Nature.