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2. Cálculo de la transmisión paralela helicoidal de la caja multiplicadora de una turbina eólica

Author

Chagoyén-Méndez, César Alberto, Moya-Rodríguez, Jorge Laureano, Álvarez-Peña, Constantina, and Muñiz-Acosta, Yaidel

Subjects
transmisiones paralelas helicoidales, wind turbine, caja multiplicadora, helical parallel transmissions, gearbox, turbina eólica
Abstract

La caja multiplicadora de una turbina eólica es el componente de mayor complejidad mecánica y es la responsable de la mayoría de la pérdida de tiempo operacional de la turbina y del incremento de los costos. La misma no alcanza una vida proyectada de 20 años. Todos los estudios hasta el momento indican que estas fallas surgen desde el proceso de diseño. Este trabajo tuvo como objetivo demostrar algunas de las insuficiencias de las normas actuales de diseño de las cajas multiplicadoras de las turbinas eólicas, a través de la realización de una comparación de los resultados del cálculo de la transmisión paralela helicoidal de una turbina eólica de 2,5 MW, realizados por tres vías: con las normas ISO 6336:2006 Método B y AGMA 2101-D04 (Metric Edition) y mediante simulación numérica. De este análisis resulta que no existen problemas de resistencia ni de rigidez en ambas transmisiones, sin embargo la diferencia entre estos tres métodos de cálculo es considerable. The gearbox of a wind turbine is the component of greatest mechanical complexity and is responsible for most wind turbines operational downtime and for increased costs. It doesn't reach a 20 years projected life. All the studies, until now, indicate that these failures arise from the design process. This work demonstrates some of the inadequacies of the current design standards of wind turbines gearboxes, through the realization of a comparison of the results of the calculation of the helical parallel transmission of an 2,5 ME wind turbine, carried out by three ways: ISO 6336:2006 Method B and AGMA 2101-D04 (Metric Edition) standards and by using numeric simulation. The results of this analysis are that there are no problems of strength or rigidity in both transmissions, however the differences between these three calculation methods are considerable.

Published
2014

5. Static and modal behavior of the chassis of a modernized bus

Author

Chagoyén Méndez, César A., Álvarez Peña, Constantina, Brito Fernández, Yunelky, Moya Rodríguez, Jorge L., and Chagoyén Méndez, Ernesto L.

Subjects
Simulación numérica, Análisis modal, Ómnibus, Análisis estático
Abstract

El presente trabajo tiene como objetivo determinar el comportamiento estático y modal del chasis de un ómnibus modernizado debido a la modificación realizada a la estructura que se montará sobre el mismo. La nueva estructura tendrá una mejor forma aerodinámica y apariencia exterior, alcanzará una mayor velocidad y cargará un mayor número de personas, por lo que es necesario recalcular el chasis para estas nuevas condiciones. Se presentan dos simulaciones numéricas mediante el Método de los Elementos Finitos: la primera de ellas se refiere al análisis estático del chasis para tres estados de carga. La segunda corresponde al análisis modal determinando las frecuencias naturales y los modos propios del chasis. Basado en los resultados de los análisis de resistencia y de rigidez se concluye que el chasis puede ser empleado para las nuevas condiciones

Published
2013

7. DETERMINACIÓN DE LA POSICIÓN DE LAS CARGAS SOBRE LOS CAMIONES.

Author

Chagoyén-Méndez, César A., Campos-Pérez, Yamill S., and Álvarez-Peña, Constantina

Subjects
*TRUCKING, *TRUCKLOAD shipping, *FREIGHT & freightage, *TRUCKS, *SHIPMENT of goods, *MECHANICAL loads
Abstract

In this paper, we presented the main problems that entail an inadequate distribution of loads on trucks and we described in detail a methodology for determining the proper position, which concludes with the completion of the installation diagrams. The methodology was obtained from the solution of the particular case of a tank of liquefied petroleum gas (LPG) of 14'000 liter on a DAF CF 75.310 truck. Another result of this work is a software which allows to determine the exact position it should be the gravity center of the load relative to the front axle and the reactions on each axis, with the possibility of evaluating different variants. [ABSTRACT FROM AUTHOR]

Published
2015

8. MODELADO Y ANÁLISIS DE LA TORRE DEL EQUIPO DE INTERVENCIÓN DE POZOS DE PETRÓLEO Y GAS.

Author

Chagoyén-Méndez, César A., Díaz-López, Jorge Luís, Chagoyén-Méndez, Ernesto L., Moya-Rodríguez, Jorge L., and Álvarez-Peña, Constantina

Subjects
*OIL well design & construction, *OIL wells, *GAS well design & construction, *SOIL-structure interaction, *OIL well drilling rigs, *MATHEMATICAL models, *EQUIPMENT & supplies
Abstract

In this paper, the modeling and analysis of one tower Workover Rig belonging to a maintenance facility for oil and gas wells is presented. When performing the maintenance of this tower, it is detected that one of the elements of the structure has some deformation. It was decided not to put it into operation and submit it to research. The modeling of invariants as well as ways of modeling soil structure interaction is discussed. It was necessary to determine the material properties with the performing of test of some samples taken on two components of the tower. The structural behavior of the tower to operating loads are then studied, proving that the effect of the deformed element in the structure is not significant for the stresses to which are subject. [ABSTRACT FROM AUTHOR]

Published
2015

9. DISEÑO DE TRANSMISIONES POR ENGRANAJES PARA REDUCTORES MEDIANTE RAZONAMIENTO BASADO EN CASOS.

Author

Hernández-Ortega, Robert, Chagoyén-Méndez, César A., Fernández-Castañeda, Feliberto, and Moya-Rodríguez, Jorge L.

Subjects
*GEARING machinery, *ARTIFICIAL intelligence, *ALGORITHMS, *MANUFACTURING industries, *INDUSTRIAL design, *WHEELS
Abstract

The cylindrical external gear reducers have a wide application in the industry. The aim of this paper is to facilitate the design and production of these machines by means of the application of the artificial intelligence technique known as case based reasoning to the design of their transmissions. The indexes for case retrieval were determined by means of expert criteria. The case base was built with gear reducer transmissions that were designed and manufactured in the industry. The case retrieval is carried out through the combination of a selection query and the nearest neighbor algorithm. By means of the integration of the case base with a CAD CAE system was obtained a case based design system of this kind of transmissions. The new design is carried out by adapting and checking the closest case to the current transmission. As the obtained solution is similar to an existing transmission, besides the design process, is also facilitated wheel production. [ABSTRACT FROM AUTHOR]

Published
2013

10. Un sistema basado en casos para el diseño de árboles.

Author

Chagoyén Méndez, César A.

Subjects
*AXLES, *CASE-based reasoning, *STRENGTH of materials, *COMPUTER-aided design, *ARTIFICIAL intelligence
Abstract

In this paper a case-based system for shafts and axles design is presented. To aid the mechanical designer is the purpose of this system, combining two techniques: CAD (Computer Aided Design) and Artificial Intelligence. [ABSTRACT FROM AUTHOR]

Published
2000

11. Análisis matricial de árboles de sección variable por el Método de los Desplazamientos.

Author

Chagoyén Méndez, César A. and Chagoyén Méndez, Ernesto L.

Subjects
*SHAFTING machinery, *METHODOLOGY, *MACHINERY, *MECHANICAL engineering, *POWER (Mechanics)
Abstract

This paper analyzes the most important aspects of the Slope-Deflection Method in its matrix approch and states the methodology for the calculation of the variable cross-section shafts. An example of the shaft calculation is given and its results are compared to another solution method. [ABSTRACT FROM AUTHOR]

Published
2000

12. La vinculación de la simulación numérica y los ensayos, su aplicación a un puente de ferrocarril

Author

Chagoyén Méndez, César A, González Martínez, David, Aragón López, Gregorio B, and Leiva Pérez, José

Subjects
análisis estructural, modelado, simulación, modeling, simulation, resistencia de materiales, lcsh:TA1-2040, lcsh:Technology (General), lcsh:T1-995, strength of materials, structural analysis, bridge, lcsh:Engineering (General). Civil engineering (General), puente
Abstract

Este trabajo introduce la motivación por los beneficios del enlace del Análisis por Elementos Finitos con los Ensayos en estructuras. En él aparece una aplicación típica en el campo del análisis estático de estructuras, específicamente a un puente de ferrocarril metálico. Se presenta un procedimiento para la calibración del modelo tanto a través del análisis de sensibilidad de la malla como a partir de mediciones extensométricas. De forma tal que mejore la correspondencia entre ambos procedimientos. This paper introduces the benefits of linking Finite Elements Analysis and laboratory testing experiences in structural analysis. One particular case is studied: the static analysis of a railroad bridge metallic structure. A procedure for calibrating the analysis model is introduced, using mesh sensibility analysis and strain gage measurements, achieving considerable improvements in the application of both approaches.

13. SINTERIZACIÓN, UN PROCESO DE CONFORMACIÓN DE METALES COMO ALTERNATIVA ECONÓMICA CON UN BAJO IMPACTO AMBIENTAL.

Author

Machado Rodríguez, Ángel Silvio, Kido Shimomoto, Eric, Silverio, Rubens, del Pino, Gilberto García, Chagoyén Méndez, César Alberto, and Moya Rodríguez, Jorge Laureano

Subjects
*SINTERING, *ENVIRONMENTAL impact analysis, *ENVIRONMENTAL monitoring, *HOT working, *ISOSTATIC pressing
Abstract

Sintering is a process of metal forming using metal powders, and it has a wide range of applications including for example, the manufacturing of parts for automotive components, home appliances, cutting tools, power tools, for the manufacturing of dental devices, among others. The process is characterized by the production of largescale low cost parts and has a low environmental impact compared to other existing technologies, it requires less energy for processing and enables high utilization of raw materials. Also, it has the characteristic of obtaining, in most cases, the parts with final tolerances necessary for direct use by the customer, which ultimately reduces considerably the cost of production. The process is characterized by minimizing the loss of raw materials; facilitating precise control of the desired chemical composition; eliminating or reducing machining operations; providing a good surface finish; being an easy production process of automation; obtaining high purity; and ensuring exactly resistance characteristics required for each project. [ABSTRACT FROM AUTHOR]

Published
2017

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