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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

Computer assistance - implications for memory performance as a function of control responsibility assigned to human operators

Narborough-Hall, C. S. January 1987 (has links)
No description available.
2

Inter-Bar Currents In Rotating Stator Induction Machines

Czarnuch, Stephen 12 1900 (has links)
This work pioneers the experimental acquisition of data relating to the heating effects of inter-bar currents and the frequency components of the main field rotating flux. Previous research in the field of inter-bar currents is reliant on theory and mathematical modeling. Yet, with the growing need for increasing machine efficiency; experimental application of conceptualized theoretical models of machine losses is paramount. Focusing specifically on inter-bar currents in a rotating stator induction machine revealed a correlation between the heat generated in the iron core and the presence of inter-bar currents. Using temperature sensing instrumentation, experimental data was gathered to determine the inter-bar current distribution along the length of the rotor bars during acceleration. Additionally, custom current transducers were implemented to directly measure the main field rotating flux. The results present a solid foundation for direct and indirect measurement of inter-bar currents. / Thesis / Master of Applied Science (MASc)
3

Modelo de Lean Manufacturing basado en el ciclo de Deming y desarrollado en Gantt para incrementar la eficiencia en empresas plásticas / Lean Manufacturing model based on the Deming cycle and developed in Gantt to increase efficiency in plastic companies

Buitrón López, Liliana 22 May 2019 (has links)
A nivel mundial se sabe que, con el transcurrir de los años la industria del sector plástico se mueve en un nivel de crecimiento que está relacionado principalmente a su amplia capacidad de transformación, combinación, durabilidad y otras aplicaciones que si son correctamente empleados contribuyen a mejorar la capacidad de competitividad de las organizaciones haciendo frente a otros convertidores. Sin embargo, esta situación creciente genera que los procesos productivos se encuentren más saturado generando mayores registros de pérdidas en tiempo que impacta en el incumplimiento de la demanda, y ya que las fábricas de producción plástica venden tiempo de máquina esta situación afecta la rentabilidad de la misma. Para poder mitigar estas situaciones se han realizado diversos esfuerzos surgiendo filosofías y metodologías que permitan encontrar la solución a estos problemas, debido a la gran importancia que tiene para las empresas trabajar con la mayor eficiencia en sus procesos y con ello buscar incrementar su disponibilidad productiva para incrementar el volumen de ventas. En tal sentido, se aborda la implementación de la metodología Lean Manufacturing aplicada bajo el soporte del ciclo Deming y cuyo objetivo principal será desarrollar una estrategia en base al ciclo PHVA que permitirá incrementar la eficiencia de máquina de manera sostenida. Su aporte se desarrolla en torno a la aplicación exitosa de la combinación de las herramientas Lean seleccionadas bajo el esquema Deming y desarrolladas bajo un cronograma de Gantt para la solución del caso y que se desarrollan en este artículo pudiendo servir de guía inicial a otros técnicos que buscan incrementar la productividad de sus procesos en otras fábricas del sector. / Worldwide, it is known that, over the years, the industry of the plastic sector is moving at a level of growth that is mainly related to its broad capacity for transformation, combination, durability and other applications that, if correctly used, contribute to improving the capacity of competitiveness of organizations facing other converters. However, this growing situation means that production processes are more saturated, generating higher losses in time that impact on non-compliance with demand, and since plastic production plants sell machine time, this situation affects the profitability of the same In order to mitigate these situations, various efforts have been made to come up with philosophies and methodologies that allow finding the solution to these problems, due to the great importance for companies to work with the highest efficiency in their processes and thus seek to increase their productive availability to increase sales volume In this regard, the implementation of the Lean Manufacturing methodology applied under the support of the Deming cycle whose main objective will be to develop a strategy based on the PHVA cycle that will increase machine efficiency in a sustained manner is approached. Its contribution is developed around the successful application of the combination of the Lean tools selected under the Deming scheme and developed under a Gantt timetable for the solution of the case and that are developed in this article, being able to serve as an initial guide to other technicians who They seek to increase the productivity of their processes in other factories in the sector. / Trabajo de investigaciòn
4

Entwicklung, Umsetzung und Untersuchung eines Antriebskonzeptes für Antriebe mit variabler Drehzahlanforderung unter stoßartiger Belastung, am Beispiel von Kaltfräsen.

Reuter, Marco 12 March 2020 (has links)
Die Dissertation befasst sich grundlegend mit der Herausforderung der Trennung der Drehzahl der primären Antriebsquelle und der Drehzahl des Arbeitswerkzeugs. Nach einer Analyse der verfügbaren Technologien wird ein neues System entwickelt. Der Konzeptentwicklung schließt sich eine eingehende analytische Betrachtung an. Durch Simulationsrechnungen werden die Leistungsfähigkeit und Effizienz hervorgehoben. Mit Hilfe einer Nutzwertanalyse erfolgt schließlich eine Auswahl des finalen Systems, welches zum Abschluss in die Realisierung geht. Die Arbeit schließt mit ersten Ergebnissen des in Hardware aufgebauten Systems.

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