07 Fakultät Konstruktions-, Produktions- und Fahrzeugtechnik
Permanent URI for this collectionhttps://elib.uni-stuttgart.de/handle/11682/8
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Item Open Access Walking without impacts as a motion/force control problem(1992) Blajer, Wojciech; Schiehlen, WernerThe paper deals with the synthesis of control for impactless bipedal walking. In order of avoid impulses, both the specified motion of the biped and its ground reactions are controlled, yielding a combined motion and force control problem. A method for modeling and solving such problems is proposed. and then illustrated by the example of an impactless planar walk of a seven-link bipedal robot. Some numerical results of the motion simulation are reported.Item Open Access A combined distance and surface profile measurement system for industrial applications : a european project(1994) Docchio, Franco; Perini, Umberto; Tiziani, Hans J.The paper reports the design, development and characterization of an electrooptical equipment suitable for distance measurements and three-dimensional gauging of surfaces of industrial interest. The equipment comprises a dual-wavelength heterodyne interferometer for absolute distance measurements with a range of 20 m and an accuracy of 0.1 mm, that is integrated with a macroscopic scale, adaptive profilometer for threedimensional measurement of the shape to 1 mm. The performance of the equipment is well suited for effective operation in industrial metrology. The equipment has been developed by three partners, namely the Dipartimento di Elettronica per I’Automarione of the University of Brescia, the Sezione Diagnostica Elettroottica of ClSE, Milan, and the lnstitut for technische Optik of the University of Stuttgart, in the framework of a European Project partially funded by the Community Bureau of Reference.Item Open Access Automatisch aufrüstbare Baukastenvorrichtungen für prismatische Werkstücke(1989) Heisel, Uwe; Thiel, W.Die Bereiche bei der flexiblen Fertigung von prismatischen Werkstücken, die von der Automatisierung bisher noch nicht erfaßt wurden, sind das Auf· und Abspannen der Werkstücke und das Auf-,Ab- und Umrüsten der Vorrichtungen. Diese Bereiche stellen somit eine Automatisierungslücke in der ansonsten automatisierten flexiblen Fertigung von prismatischen Werkstücken dar. So soll nun ein weiterer Bereich in den automatisierten Fertigungsablauf integriert werden.Item Open Access Robust Design Methodology for the development of commercial vehicle braking systems(2015) Kemmler, Stefan; Leopold, Tobias; Fricke, Jens; Bertsche, BerndToday’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.Item Open Access Phase shifting in an oblique incidence interferometer(1991) Boebel, Doris; Packroß, Bernd; Tiziani, Hans J.The evaluation of the interference pattern of a prism interferometer by a phase-stepping technique is described. The required phase shift is achieved by moving the surface under test perpendicular to the hypotenuse of the prism. Limits of this phase-shifting technique are discussed. A calibration method of the phase shift between the interferograms for the adjustable sensitivity of the interferometer is shown. Finally measurements of technical surfaces are presented.Item Open Access Mathematical modeling of signal transduction pathways in mammalian cells at the example of the EGF induced MAP kinase cascade and TNF receptor crosstalk(2004) Schoeberl, Birgit; Gilles, Ernst Dieter (Prof. Dr.-Ing. Dr. h.c. mult.)In this work we apply mathematical modeling to signal transduction networks in mammalian cells. In particular, we have developed models for a survival pathway, the EGF induced MAP kinase cascade and an apoptotic signal trans-duction network the TNF receptor crosstalk. The models presented here are based on and were validated with own experimental data. In the field of signal transduction the major proteins involved and their interactions are fairly well known and biochemically characterized . One characteristic of signal transduction networks is that they are highly interconected by positive and negative feedbacks. Therefore, the dynamics of these networks can not be understood by intuition alone. Mathematical modeling has proven to be a valuable tool in engineering that deals effectively with complexity. In both casese were able to verify hypotheses, which were obtained by the models, experimentally. This work shows that mathematical modeling in combination with quantitative experimental data can give new insights into the potential mechanisms of intracellular signal transduction and regulation.Item Open Access Determination of average roughness and profile autocorrelation width of metallic surfaces with a white light sensor(1984) Leonhardt, Klaus; Kaufmann, Ekkehart; Tiziani, Hans J.A new procedure to determine simultaneously a horizontal descriptor of the surface - the autocorrelation width - and the most important vertical descriptor - the root-mean-square roughness - is presented. It is based on the inversion of an analytic contrast formula. After a short introduction to white light random phase contrast measurement we describe the elimination process and show first experimental verifications.Item Open Access Contouring using two-wavelength electronic speckle pattern interferometry employing dual-beam illuminations(1992) Diao, Hongyan; Peng, Xiang; Zou, Yunlu; Tiziani, Hans J.; Chen, L.Es wird eine neue Konturing-Methode mit einer elektronischen Zweiwellenlängen-Speckle-Interferometrie (TWESPI) vorgeschlagen, bei der zwei Beleuchtungsstrahlen verwendet werden. Die optisch rauhe Oberfläche wird bei einer synthetischen längeren equivalenten Wellenlänge vermessen, so daß durch die Änderung der Wellenlängen eine variable Meßempfindlichkeit erhalten werden kann. Dadurch erweitert diese Technik den Meßbereich der Einwellen-Speckle-Interferometrie und erlaubt die Messung von Konturen steiler Profile als bisher mit der Einwellenlängen-Methode möglich war.Item Open Access Optimierung des Fahrverhaltens(1992) Langenbeck, Bernhard; Leister, Günter; Schiehlen, Werner; Kutzbach, Heinz-DieterDas Fahrverhalten von Traktoren wird durch eine Vielzahl von Konstruktionsparametern bestimmt. Durch gegenseitige Abhängigkeiten der Parameter gestaltet sich die Suche nach einer geeigneten Parameterkombination aufwendig. Ein Verfahren zur Optimierung von mechanischen Systemen, die durch Mehrkörpermodelle beschrieben werden können, wird auf das Fahrverhalten eines Traktors angewendet.Item Open Access Betrachtungen zum dynamischen Verhalten druckgeregelter Flügelzellenpumpen(1990) Heisel, Uwe; Fiebig, Wieslaw; Matten, NicholasZur Optimierung hydrostatischer Verdrängerpumpen wurde in den letzten Jahren verstärkt an Simulationsmodellen gearbeitet, die das dynamische Verhalten vorausbestimmen lassen. Während diese Simulation bei Zahnradpumpen und Axialkolbenpumpen gute Übereinstimmungen zwischen Rechnung und Messung ergibt, sind für druckgeregelte, einpolige Flügelzellenpumpen bisher keine geeigneten Modelle bekannt. Der vorliegende Aufsatz beschreibt die Vorgehensweise bei der Aufstellung eines dynamischen Simulationsmodells für einpolige Flügelzellenpumpen unter Berücksichtigung realer Randbedingungen.
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