Refine
Year of publication
Document Type
- Conference Proceeding (642)
- Article (429)
- Other Publications (143)
- Part of a Book (141)
- Working Paper (128)
- Book (118)
- Report (115)
- Journal (Complete Issue of a Journal) (85)
- Master's Thesis (77)
- Doctoral Thesis (58)
Language
- German (1115)
- English (883)
- Multiple languages (8)
Keywords
Institute
- Fakultät Architektur und Gestaltung (41)
- Fakultät Bauingenieurwesen (105)
- Fakultät Elektrotechnik und Informationstechnik (34)
- Fakultät Informatik (121)
- Fakultät Maschinenbau (60)
- Fakultät Wirtschafts-, Kultur- und Rechtswissenschaften (106)
- Institut für Angewandte Forschung - IAF (115)
- Institut für Naturwissenschaften und Mathematik - INM (3)
- Institut für Optische Systeme - IOS (40)
- Institut für Strategische Innovation und Technologiemanagement - IST (60)
Ein Gestalter - in allem
(2016)
This work investigates data compression algorithms for applications in non-volatile flash memories. The main goal of the data compression is to minimize the amount of user data such that the redundancy of the error correction coding can be increased and the reliability of the error correction can be improved. A compression algorithm is proposed that combines a modified move-to-front algorithm with Huffman coding. The proposed data compression algorithm has low complexity, but provides a compression gain comparable to the Lempel-Ziv-Welch algorithm.
In this paper, a gain-scheduled nonlinear control structure is proposed for a surface vessel, which takes advantage of extended linearisation techniques. Thereby, an accurate tracking of desired trajectories can be guaranteed that contributes to a safe and reliable water transport. The PI state feedback control is extended by a feedforward control based on an inverse system model. To achieve an accurate trajectory tracking, however, an observer-based disturbance compensation is necessary: external disturbances by cross currents or wind forces in lateral direction and wave-induced measurement disturbances are estimated by a nonlinear observer and used for a compensation. The efficiency and the achieved tracking performance are shown by simulation results using a validated model of the ship Korona at the HTWG Konstanz, Germany. Here, both tracking behaviour and rejection of disturbance forces in lateral direction are considered.
Sliding-mode observation with iterative parameter adaption for fast-switching solenoid valves
(2016)
Control of the armature motion of fast-switching solenoid valves is highly desired to reduce noise emission and wear of material. For feedback control, information of the current position and velocity of the armature are necessary. In mass production applications, however, position sensors are unavailable due to cost and fabrication reasons. Thus, position estimation by measuring merely electrical quantities is a key enabler for advanced control, and, hence, for efficient and robust operation of digital valves in advanced hydraulic applications. The work presented here addresses the problem of state estimation, i.e., position and velocity of the armature, by sole use of electrical measurements. The considered devices typically exhibit nonlinear and very fast dynamics, which makes observer design a challenging task. In view of the presence of parameter uncertainty and possible modeling inaccuracy, the robustness properties of sliding mode observation techniques are deployed here. The focus is on error convergence in the presence of several sources for modeling uncertainty and inaccuracy. Furthermore, the cyclic operation of switching solenoids is exploited to iteratively correct a critical parameter by taking into account the norm of the observation error of past switching cycles of the process. A thorough discussion on real-world experimental results highlights the usefulness of the proposed state observation approach.
Monitor Energiewende 2016
(2016)
Cloud Computing
(2016)
Der deutsche Jesuit Johannes Schreck, latinisiert Terrentius SJ (1576–1630), gehört zu den herausragenden, aber wenig bekannten frühen Chinamissionaren. Er war ein Freund Galileo Galileis, Mitglied der Accademia dei Lincei in Rom, ein bedeutender Arzt und Botaniker, Astronom und Mathematiker. 1611 trat er in den Jesuitenorden ein. Von 1619 bis zu seinem Tod 1630 wirkte er als Wissenschaftler und Missionar in China. Seine Leistungen auf den Gebieten der Medizin, Botanik, Astronomie, Technik und Philologie sind von großer Vielfalt und Breite. Erstmals liegt hier ein wissenschaftlich fundiertes Werk vor, das auch Sammlungen und Übersetzungen der Quellen, der Nachrufe und der zahlreichen Briefe von, an und über Schreck in deutscher Sprache enthält. Aus verschiedenen Blickwinkeln betrachten namhafte Wissenschaftler in diesem Band das Leben und Wirken dieser interessanten und vielschichtigen Persönlichkeit der Frühen Neuzeit.
The method of signal injection is investigated for position estimation of proportional solenoid valves. A simple observer is proposed to estimate a position-dependent parameter, i.e. the eddy current resistance, from which the position is calculated analytically. Therefore, the relationship of position and impedance in the case of sinusoidal excitation is accurately described by consideration of classical electrodynamics. The observer approach is compared with a standard identification method, and evaluated by practical experiments on an off-the-shelf proportional solenoid valve.
Several possibilities of tests under load on a chassis dynamometer are presented. Consumption measurements according standard driving cycles as the New European Drive Cycle (NEDC) and Worldwide harmonized light duty test procedure/cycle (WLTP/WLTC) make special attention to the observance of the regulations necessary. The rotational masses of inertia and the load depending on velocity have to match the required values. Load tests as well allow the determination of the maximum acceleration in the current gear and the slippage of the driven wheels.
The aim of the paper is to present the simulation of the sweeping process based on a mathematical model that includes the drag force, the lift force, the sideway force, and the gravity. At the beginning, it is presented a short history of the street sweepers, some considerations about the sweeping process and the parameters of the sweeping process. Considering the developed model, in Matlab there is done some simulation for the trajectory of a spherical pebble. The obtained results are presented in graphical shape.
Energiewirtschaft und Wassernutzung stehen aufgrund der großen Bedeutung von Kohle-, Kern-, und Wasserkraftwerken in Baden-Württemberg in einem engen Zusammenhang. Niedrige Flusswasserstände können in Trockenzeiten zu Konflikten zwischen den verschiedenen Wassernutzern z.B. der Kühlwassernutzung (Abbildung 1), Bewässerung sowie der Nutzung des Neckars als Schifffahrtsstraße führen. Seit dem Trockensommer 2003 nimmt das Bewusstsein für die Relevanz konkurrierender Wassernutzungen, u.a. von Kühlwassernutzung, Bewässerung für die Landwirtschaft, Nutzung der Wasserwege für den Transport von Massengütern sowie für Belange des Naturschutz zu.