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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

Konzeption eines Assistenzsystems für die Entwicklung innermaschineller Verfahren für produktionstechnische Systeme / Conceptualization of an assistance system for process models of processing machines

Weber, Paul 05 June 2018 (has links) (PDF)
Ziel der vorliegenden Arbeit ist die Erstellung eines Konzeptes für ein softwarebasiertes Assistenzsystem für die Erstellung des innermaschinellen Verfahrens produktionstechnischer Systeme. Das Konzept wird dabei in Form eines Software-Mockups für die Benutzerschnittstelle des Systems präsentiert. Nach einer Recherche zum Stand von Wissenschaft und Technik, hinsichtlich des konstruktiven Entwicklungsprozesses von Verarbeitungsmaschinen, werden besonders die Arbeitsinhalte und Methoden der zum Prozess zugehörigen Konzeptphase untersucht. Dabei wird abschließend geprüft, inwiefern konkrete Rechnerunterstützungen für die Konzeptphase des allgemeinen Maschinenbaus auf den Bereich des Verarbeitungsmaschinenbaus übertragbar sind. Es folgt die Zusammenfassung verschiedener Vorgehensmodelle für die Softwareentwicklung sowie ein Überblick zu den Grundlagen der Softwareergonomie. Bei der folgenden Konzeptentwicklung werden die Rechercheergebnisse aufgegriffen. Angelehnt an die Arbeitsschritte des klassischen Phasenmodells der Softwareentwicklung werden zunächst Anforderungen und Spezifikationen für das zu entwickelnde Assistenzsystem aufgestellt. In einer sich anschließenden Entwurfsphase wird der zukünftige Systemaufbau umrissen. Zudem werden Entwürfe, in Form von Wireframes, für die Darstellung einzelner Funktionalitäten der künftigen Benutzerschnittstelle des Assistenzsystems erstellt. Diese werden verglichen und kombiniert, sodass eine gewählte Vorzugslösung für die Mockup-Erstellung bereitsteht. Abschließend werden, nach erfolgter Umsetzung des Mockups, für die Erstellung des innermaschinellen Verfahrens anhand eines konkreten Maschinenbeispiels, Möglichkeiten zur Konzepterweiterung und -umsetzung vorgeschlagen. / The aim of the following thesis is the development of a concept for a software-based assistance system which supports the creation of the process model of processing machines. The concept is presented as a software mockup that shows the user interface of the system. After an investigation on the state of science and technology, regarding the constructive development process of processing machines, especially the contents and methods of the concept phase, which is associated with the process, are examined. Finally, it is being checked which specific computer support for the concept phase of general mechanical engineering can be transferred to the field of processing machine construction. The summary of various proceed models for general software development follows as well as an overview on the basics of software ergonomics. During the subsequent concept development, the findings from the research are used. Based on the work steps of the phase model of software development, requirements and specifications for the concept, which has been developed, are initially set up. In the following design phase, the future system structure is outlined. In addition, drafts presented as wireframes are created for the presentation of individual functionalities of the future user interface of the assistance system. In the conclusion they are compared to and combined with each other so that a chosen preferred solution is available for mockup creation. Finally, after the realization of the mockup that shows the creation of the process model based on a tangible machine example, ways to expand and to implement the concept are proposed.
2

Design and Analysis of an adaptive λ-Tracking Controller for powered Gearshifts in automatic Transmissions

Loepelmann, Peter 30 March 2015 (has links) (PDF)
To meet the continuously increasing goals in vehicle fuel efficiency, a number of measures are taken in automotive powertrain engineering, such as the combination of electric drives and conventional combustion engines in hybrid vehicles or the increase in gear ratios. This development leads to more complex powertrain systems, such as automatic transmissions. At the same time, the need for complex control systems is increased to achieve this desired functionality. Automatic transmissions are controlled by an electro-hydraulic control unit that governs all operations such as gear shifting and starting. Since most of the control software is designed in the form of open-loop control, most of the operations have to be calibrated manually. Thus, there exists a large number of calibration parameters in the control software that have to be tuned individually for each combination of engine, transmission and vehicle model. This process is therefore time-consuming and costly. Hence, it would be advantageous to reduce the need for calibration and in the end shorten the development process for automatic transmissions by reducing software complexity while maintaining functionality and performance. The goal of this thesis is to replace parts of the control software responsible for conducting the gearshifts that require extensive tuning by implementing control systems that have no need for calibration: adaptive high-gain λ-tracking controllers. In order to obtain the control parameters, i.e., the feedback gains, without calibration, an adaption law is implemented that continuously computes these parameters during operation of the controller. Thus, calibration is no longer needed. Since the system has to be high-gain-stabilizable, an extensive system analysis is conducted to determine whether an adaptive λ-tracking controller can be implemented. A nonlinear model of the clutch system dynamics is formulated and investigated. As a result, high-gain stability is proven for the system class and validated in simulation. Following the stability analysis, the devised adaptive controller is implemented into the control software running on the series production transmission control unit. Extensive simulations with a comprehensive vehicle model running the extended transmission software are conducted to design and to test the adaptive controllers and their underlying parameters during transmission operation in order to evaluate the control performance. The control software containing the adaptive controller is then implemented in two distinct vehicles with different automatic transmissions equipped with series production control hardware for the purpose of hardware experiments and validation. The resulting reduction of calibration efforts is discussed.

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