07 Fakultät Konstruktions-, Produktions- und Fahrzeugtechnik

Permanent URI for this collectionhttps://elib.uni-stuttgart.de/handle/11682/8

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Institute: search.filters.UBSInstitut.Institut für MaschinenelementePublication Type: search.filters.UBSTyp.Konferenzbeitrag

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    Systematisches Toleranz Design unter Berücksichtigung von Funktions- und Kostenaspekten nach der robusten Zuverlässigkeitsmethode SMAR²T
    (2015) Kemmler, Stefan; Fuchs, Alexander; Leopold, Tobias; Bertsche, Bernd
    Tendenzen für heutige Herausforderungen zur effizienten Produktentwicklung verlagern sich in Richtung von simulativ gestützten virtuellen Herangehensweisen. Hierfür werden in der industriellen Entwicklung komplexer Produkte zunehmend Methoden angewandt, die unter Einsparung von notwendigen Ressourcen umfassende realitätsnahe Ergebnisse liefern. Diese Ergebnisse werden zielgerichtet an die jeweilige Anforderung unter Berücksichtigung deren Robustheit, technische Realisierbarkeit sowie Kosten bezüglich variierender Toleranzeinstellungen, optimiert. Zur Veranschaulichung der methodischen Vorgehensweise zum Gestalten robuster und zuverlässiger Produkte unter Berücksichtigung von Funktions- und Kostenaspekten wird die Vorgehensweise zur Bestimmung eines Kostenmodells im Toleranz Design nach SMAR²T (Systematic Method for Axiomatic Robust Reliability-Testing Method) anhand eines einfachen technischen Systems (Überlastkupplung) diskutiert.
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    Influence of protection lips on the frictional torque of rotary shaft seals
    (2024) Olbrich, Christoph; Feldmeth, Simon; Bauer, Frank
    Rotary shaft seals are used to seal rotating machine parts. In most cases one single sealing lip (main lip) contacts the shaft and separates the fluid on one side from the environment on the other side. To prevent the entry of other fluids and or particles, seals with additional protection lips are used (two lips), especially in heavily contaminated environments. When the protection lip contacts the shaft, a vacuum can form between the main lip and the protection lip, leading to increased contact pressure and friction. The increased frictional torque generates more heat and leads to overheating in the contact area between the lip and the shaft. Test runs conducted on a friction torque test bench with various seal configurations confirm that the two lips influence each other. Higher frictional torques and contact temperatures occur, when the volume between the lips isn't vented. This shows the importance of venting.
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    Rasselgeräuschprüfstand zur Untersuchung von Fahrzeuggetrieben
    (2011) Fietkau, Peter; Baumann, Axel; Bertsche, Bernd
    In diesem Aufsatz wird der Klapper- und Rasselgeräuschprüfstand am Institut für Maschinenelemente der Universität Stuttgart vorgestellt. Der Prüfstand wurde speziell entwickelt, um die bei Fahrzeuggetrieben auftretenden Losteilgeräusche (Klapper- und Rasselgeräusche) untersuchen zu können. Neben der Beschreibung des allgemeinen Prüfstandsaufbaus wird genauer auf das Regelungskonzept sowie die verwendete Messtechnik eingegangen. Diese zeichnet sich unter anderem durch eine hochgenaue Erfassung der Drehschwingungen aus. Dadurch ist es möglich, Relativbewegungen im Betrieb von im Eingriff stehenden Zahnrädern hochauflösend aufzuzeichnen. Abschließend werden einige exemplarische Messungen dargestellt.
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    Robust Design Methodology for the development of commercial vehicle braking systems
    (2015) Kemmler, Stefan; Leopold, Tobias; Fricke, Jens; Bertsche, Bernd
    Today’s product requirements demand an ever increasing functionality for the same space and usually the same number of components. Thereby, the quality, reliability and robustness of these products should be preserved or even be increased. This target conflict cannot be solved without compromises. The research community between the Institute of Machine Components (IMA), University of Stuttgart, and the Knorr-Bremse Systeme für Nutzfahrzeuge GmbH is seeking for new solutions for these challenges. The new approaches for designing robust and reliable products are being implemented directly in a current development project of an innovative Air Disc Brake (ADB). With “Systematic Method for Axiomatic Robustness-Testing” (SMART), reliability methods and the basic concept of Robust Design methodology are related to the Taguchi Method. SMART is based on three phases: System, Parameter and Tolerance Design; accordingly, the sample phases of VDA (Association of German Automotives) are used as milestones. In the System Design, SMART focuses on the decreasing complexity according to the functional dependences of the DPs, thus precluding early random failures. In the Parameter Design phase, SMART gives the developer an approach for modeling an adaptive simulation model (SIM-SMART). This model also enables the simulation of random and possible fatigue failures in addition to the nominally robust DPs. In the early stage of product development, reliability predictions are possible. In the iterative Tolerance Design phase, the final tolerance limits for robust and reliable products are defined with consideration of compromises in terms of costs, quality and technical feasibility. With the application of SMART, a design concept of a new generation of an ADB with less complexity is created. The extensive functions for flexible function studies are modeled with the objective of SIM-SMART. Accordingly to this model, parameter studies for determination of the nominal adjustment levels can be performed and their random and fatigue failures modeled. In conclusion, more accurate reliability test strategies are recommended using the definition of tolerance limits. The cost aspect and technical feasibility are also taken into account. So far, SMART has not been added to the iterative Tolerance Design phase. With this paper, the method is not only extended to this phase, but also sufficiently validated. In addition, SMART can predict and analyze random failures. With its three coherent and iterative phases, it is an as yet unpublished and unimplemented approach for designing even more robust and reliable products. Robust Design Methodology and reliability methods are fundamental building blocks for products with high quality requirements. SMART presents an approach to support the designing of robust, reliable, highly functional and innovative ADB.
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    Einflüsse praxisrelevanter Systemparameter auf das Förderverhalten von Radial-Wellendichtungen
    (2018) Bekgulyan, Sumbat; Simon, Feldmeth; Bauer, Frank
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    PTFE lip-seals with bi-directional sealing aids
    (2012) Gölz, Jan; Goujavin, Witalij; Bauer, Frank; Haas, Werner