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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Mantenimiento de ruedas ferroviarias en un torno de bajo nivel Hegenscheidt tipo 102

Juárez Blanco, Jorge Raúl 22 January 2018 (has links)
Este trabajo presenta el mantenimiento de ruedas ferroviarias en un torno de bajo nivel Hegesncheidt Tipo 102, abarca la descripción actual de una empresa operadora de transporte ferroviario local y las acciones de mantenimiento que realiza el área de mecánica de todo su parque tractivo. El proceso de reperfilado es un mantenimiento correctivo de desgastes y defectos en las ruedas dada su interacción constante con los rieles. Se empleó fundamentos de mecanizado por arranque de viruta para determinar los tiempos teóricos e utilizarlos como medio referencial para definir el problema. Utilizando herramientas para recopilar información, interactuando con las personas involucradas y, mediante la aplicación de una metodología de mejora continua para mantenimiento como el “Diagrama de Ishikawa o Espina de Pescado”, se organizó la data recibida para elaborar los criterios e argumentos necesarios con el fin de lograr el objetivo de identificar las causas que originan el alto consumo de placas de corte al reperfilar ruedas. Finalmente presentamos conclusiones y recomendaciones a las que se llegó empleando el método y que sirvan como referencia para futuros trabajos o modificaciones en el torno de bajo nivel Hegenscheitd Tipo 102, elaboración de nuevos procedimientos o como medio de valoración para la compra de nuevos equipos en caso la empresa evaluada lo requiera. / Tesis
2

Modelling, simulation and experimental verification of a wheeled-locomotion system based on omnidirectional wheels

Flores Álvarez, Pedro Alonso 01 December 2016 (has links)
The following work focuses on the kinematic and dynamic study of a four-wheeled robot, which is equipped with omnidirectional Mecanum wheels. The main objective of the thesis is to obtain a mathematical model from which both the kinematics and kinetics of the robot can be analyzed. Furthermore, the study presents a methodology to optimize the torques (and subsequent associated voltages) provided by each of the motors on the robot for a given trajectory. A system in which a non-powered trailer pulled by the robot is also analyzed at a kinematic level. In this stage, four different cases are considered. The construction of the trailer is also described on this work. In the first chapter, the global state of the art on analysis and control of omnidirectional robots (with focus on robots with Mecanum wheels) is presented. In the second chapter, the physical considerations for the general movement of the robot are analyzed, in order to derive the kinematic constrain equations of the locomotion system. The differential equation of motion is then derived using Lagrange-equations with multipliers. This chapter presents as well the kinematic analysis for a robot-trailer system. The third chapter describes the general process on the design of the trailer, including the rejected ideas for its construction. The fourth chapter focuses on verifying the final results of the design process, as well as tests to check the mobility of the system. Conclusions and future work are analyzed on the final part of the document, as well as the references and the acknowledgments to all the people involved in the project. / Tesis
3

Mantenimiento de ruedas ferroviarias en un torno de bajo nivel Hegenscheidt tipo 102

Juárez Blanco, Jorge Raúl 22 January 2018 (has links)
Este trabajo presenta el mantenimiento de ruedas ferroviarias en un torno de bajo nivel Hegesncheidt Tipo 102, abarca la descripción actual de una empresa operadora de transporte ferroviario local y las acciones de mantenimiento que realiza el área de mecánica de todo su parque tractivo. El proceso de reperfilado es un mantenimiento correctivo de desgastes y defectos en las ruedas dada su interacción constante con los rieles. Se empleó fundamentos de mecanizado por arranque de viruta para determinar los tiempos teóricos e utilizarlos como medio referencial para definir el problema. Utilizando herramientas para recopilar información, interactuando con las personas involucradas y, mediante la aplicación de una metodología de mejora continua para mantenimiento como el “Diagrama de Ishikawa o Espina de Pescado”, se organizó la data recibida para elaborar los criterios e argumentos necesarios con el fin de lograr el objetivo de identificar las causas que originan el alto consumo de placas de corte al reperfilar ruedas. Finalmente presentamos conclusiones y recomendaciones a las que se llegó empleando el método y que sirvan como referencia para futuros trabajos o modificaciones en el torno de bajo nivel Hegenscheitd Tipo 102, elaboración de nuevos procedimientos o como medio de valoración para la compra de nuevos equipos en caso la empresa evaluada lo requiera.
4

Modelling, simulation and experimental verification of a wheeled-locomotion system based on omnidirectional wheels

Flores Álvarez, Pedro Alonso 01 December 2016 (has links)
The following work focuses on the kinematic and dynamic study of a four-wheeled robot, which is equipped with omnidirectional Mecanum wheels. The main objective of the thesis is to obtain a mathematical model from which both the kinematics and kinetics of the robot can be analyzed. Furthermore, the study presents a methodology to optimize the torques (and subsequent associated voltages) provided by each of the motors on the robot for a given trajectory. A system in which a non-powered trailer pulled by the robot is also analyzed at a kinematic level. In this stage, four different cases are considered. The construction of the trailer is also described on this work. In the first chapter, the global state of the art on analysis and control of omnidirectional robots (with focus on robots with Mecanum wheels) is presented. In the second chapter, the physical considerations for the general movement of the robot are analyzed, in order to derive the kinematic constrain equations of the locomotion system. The differential equation of motion is then derived using Lagrange-equations with multipliers. This chapter presents as well the kinematic analysis for a robot-trailer system. The third chapter describes the general process on the design of the trailer, including the rejected ideas for its construction. The fourth chapter focuses on verifying the final results of the design process, as well as tests to check the mobility of the system. Conclusions and future work are analyzed on the final part of the document, as well as the references and the acknowledgments to all the people involved in the project. / Tesis

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