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Techniken zur Energiewende - studentische Fachkonferenz im Masterstudiengang Elektrische Systeme (2013)
Die studentische Fachkonferenz im Rahmen des Seminars im Masterstudiengang Elektrische Systeme in der Fakultät für Elektrotechnik und Informationstechnik wird zum sechsten Mal veranstaltet. Alle Studierenden erarbeiten unter dem vorgegebenen Rahmenthema eigene Beiträge, recherchieren, ergänzen, stellen die aktuellen Erkenntnisse zu wissenschaftlichen Publikationen zusammen. Die Energiewende ist seit einigen Jahren ein heiß diskutiertes Thema. Die dezentrale Energieversorgung unter Anwendung erneuerbarer Quellen, insbesondere Wind- und Solarkraft, ist langfristig gesehen die einzige Antwort auf die Ausbeutung der Erde und Zerstörung der Umwelt durch Gewinnung nichtregenerativer Energien, insbesondere Öl, Erdgas und Uran. Allerdings gibt es noch viele Bereiche, die intensive wissenschaftliche und entwicklungstechnische Arbeiten benötigen. Wie aus dem Titel durch Verwendung des Wortes „zur“ anstatt „der“ schon erkennbar, werden in dieser Fachtagung weniger die Techniken betrachtet, die schon zum Einsatz kommen, sondern zukünftige Techniken, die gedanklich auf Papier gebracht wurden, oder inzwischen das Stadium der Machbarkeitsstudie erreicht haben. Das Thema Energiewende beinhaltet ein sehr breites Feld von Techniken. Daher haben sich die Teilnehmer auf nur wenige, wichtige Gebiete konzentriert: Regenerative Energiegewinnung, Elektromobilität, Speichertechnologien und Smart Grid. Durch das intensive Befassen mit diesen Themen haben sich die Studierenden zum ersten Mal richtig mit den Problemen der Energiewende vertraut gemacht. Sie haben dabei erkannt, dass für die Ingenieure der Fachrichtungen Elektrotechnik und Informationstechnik überaus vielfältige, spannende und auch aus gesellschaftspolitischer Sicht notwendige und lohnende Aufgaben auf sie warten.
SInCom 2015 (2015)
2nd Baden-Württemberg Center of Applied Research Symposium on Information and Communication Systems, SInCom 2015, 13. November 2015 in Konstanz
Lake Constance 5D-Conference 2015 (2015)
Smart-Future-Living-Bodensee (2018)
All the papers in this book correspond to works presented during the workshop ”Smart-Future-Living-Bodensee”, held in Konstanz, Germany, on November 24, 2017
Total nonnegativity of matrices related to polynomial roots and poles of rational functions (2015)
Adm, Mohammad ; Garloff, Jürgen
Sign regular matrices having the interval property (2015)
Adm, Mohammad ; Garloff, Jürgen
We consider classes of (Formula presented.)-by-(Formula presented.) sign regular matrices, i.e. of matrices with the property that all their minors of fixed order (Formula presented.) have one specified sign or are allowed also to vanish, (Formula presented.). If the sign is nonpositive for all (Formula presented.), such a matrix is called totally nonpositive. The application of the Cauchon algorithm to nonsingular totally nonpositive matrices is investigated and a new determinantal test for these matrices is derived. Also matrix intervals with respect to the checkerboard ordering are considered. This order is obtained from the usual entry-wise ordering on the set of the (Formula presented.)-by-(Formula presented.) matrices by reversing the inequality sign for each entry in a checkerboard fashion. For some classes of sign regular matrices, it is shown that if the two bound matrices of such a matrix interval are both in the same class then all matrices lying between these two bound matrices are in the same class, too.
Matrices Having the Interval Property (2018)
Adm, Mohammad ; Garloff, Jürgen
Optimal determinantal criteria for and intervals of totally nonnegative matrices (2017)
Adm, Mohammad ; Garloff, Jürgen
Efficient determinantal tests for sign regular matrices (2017)
Adm, Mohammad ; Garloff, Jürgen
A novel method for determining the rank of a matrix (2017)
Adm, Mohammad ; Garloff, Jürgen
Presentation
Recent applications of the Cauchon algorithm to the totally nonnegative matrices (2017)
Adm, Mohammad ; Garloff, Jürgen
Intervals of sign regular matrices (2015)
Adm, Mohammad ; Garloff, Jürgen ; Titi, Jihad
Root location of polynomials whose finite Hurwitz matrix is totally nonnegative (2018)
Adm, Mohammad ; Garloff, Jürgen ; Tyaglov, Mikhail
Compression of short data blocks to improve the reliability of non-volatile flash memories (2016)
Ahrens, Tobias ; Rajab, Mohammed ; Freudenberger, Jürgen
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.
Recent applications of the Cauchon algorithm to intervals of totally nonnegative matrices (2018)
Al Muhtaseb, Khawla ; Adm, Mohammad ; Ghani, Ayed Abedel ; Garloff, Jürgen
Nachhaltigkeit im industriellen Umfeld (2015)
Alf, Dario ; Bode, Konstantin ; Brugger, Christoph ; Brunner, Andrea ; Gegelmann, Alexander ; Glökler, Christian ; Halmosi, Silvan ; Homberger, Dominik ; Kraus, Leonard ; Liebert, Michael ; Löbert, Judith ; Mahlke, Jana ; Merk, Katrin ; Moosmann, Marina ; Ochs, Veronika ; Ranz, Iris ; Regnet, Fabian ; Rehm, Kevin ; Rogowski, Igor ; Schweikart, Vanessa ; Seitz, Philipp ; Tegel, Florian ; Tuchek, Isabelle Maria ; Vögele, Thomas ; Wenger, Arne ; Zabo, Susann
Im Rahmen der Lehrveranstaltung "Nachhaltigkeit im industriellen Umfeld" im Masterstudiengang Umwelt- und Verfahrenstechnik der Hochschulen Konstanz und Ravensburg-Weingarten wurde 2015 eine studentische Fachkonferenz durchgeführt. Die Studierenden entwickelten in Einzelarbeit oder als Zweierteam Konferenzbeiträge zu folgenden Themen: - Innovationen und Spannendes aus dem Bereich der Energieerzeugung und -wandlung - Aspekte der Schließung von Stoffkreisläufen und Vermeidung von Schadstoffeinträgen in die Umwelt - Chancen und Herausforderungen Nachwachsender Rohstoffe bei verschiedenen Einsatzmöglichkeiten sowie Themen der Nachhaltigkeit in der Landwirtschaft - verschiedene Blickwinkel auf das Thema Wasser (von der Abwasserreinigung bis zum Wasserkonsum der Konsumenten) - die Betrachtung spezifischer Industrien und Unternehmen sowie deren Werkzeuge zur Umsetzung von Nachhaltigkeit Die Ergebnisse der studentischen Fachkonferenz zur „Nachhaltigkeit im industriellen Umfeld“ werden in der vorliegenden Publikation präsentiert.
On the spectral properties of square matrices that are strictly sign-regular of some order k (2018)
Alseidi, Rola ; Garloff, Jürgen
A matrix is called strictly sign-regular of order k (SSR_k) if all its k-by-k minors are nonzero and have the same sign. In this poster, the spectral properties of nonsingular matrices which are SSR_k for a specific value k are studied.
Quality analysis of tomatoes while drying (2015)
Arendt, Saskia ; Hofacker, Werner ; Speckle, Wolfgang
Nonlinear observer-based ship control and disturbance compensation (2016)
Aschemann, Harald ; Wirtensohn, Stefan ; Reuter, Johannes
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.
Corporate Entrepreneurship als alternativer Innovationspfad (2016)
Baltes, Guido H.
Innovation mit digital-gestützten Geschäftsmodellen (2015)
Baltes, Guido H.
Strategie der digitalen Ära (2015)
Baltes, Guido H.
Umsetzungskonzepte der Digitalen Transformation (2015)
Baltes, Guido H.
Digitale Transformation (2015)
Baltes, Guido H.
Strategische Innovation für Erfolg in dynamischen Märkten (2015)
Baltes, Guido H.
Investigating the effectiveness of tactical business coaching for technology-based ventures in increasing survival (2015)
Baltes, Guido H. ; Ungerer, Christina
The supply and use framework of national accounts (2017)
Beutel, Jörg
Economic diversification and sustainable development (2018)
Beutel, Jörg
Interdisziplinäre Bestandserfassung und Bewertung einer denkmalgeschützten Bogenbrücke aus Naturstein mit Instandsetzungs- und Ertüchtigungskonzept (2014)
Bewer, Andreas ; Patitz, Gabriele ; Schuster, Ralf ; Wendler, Eberhard ; Stürmer, Sylvia
Probabilistic Collision Avoidance for Vessels (2015)
Blaich, Michael ; Köhler, Steffen ; Reuter, Johannes ; Hahn, Axel
The improvement of collision avoidance for vessels in close range encounter situations is an important topic for maritime traffic safety. Typical approaches generate evasive trajectories or optimise the trajectories of all involved vessels. Such a collision avoidance system has to produce evasive manoeuvres that do not confuse other navigators. To achieve this behaviour, a probabilistic obstacle handling based on information from a radar sensor with target tracking, that considers measurement and tracking uncertainties is proposed. A grid based path search algorithm, that takes the information from the probabilistic obstacle handling into account, is then used to generate evasive trajectories. The proposed algorithms have been tested and verified in a simulated environment for inland waters.
Mission integrated collision avoidance for USVs using laser range finder (2015)
Blaich, Michael ; Köhler, Steffen ; Schuster, Michael ; Schuchhardt, Thomas ; Reuter, Johannes ; Tietz, Thomas
Motion safety for vessels (2015)
Blaich, Michael ; Weber, Simon ; Reuter, Johannes ; Hahn, Axel
The improvement of collision avoidance for vessels in close range encounter situations is an important topic for maritime traffic safety. Typical approaches generate evasive trajectories or optimise the trajectories of all involved vessels. The idea of this work is to validate these trajectories related to guaranteed motion safety, which means that it is not sufficient for a trajectory to be collision-free, but it must additionally ensure that an evasive manoeuvre is performable at any time. An approach using the distance and the evolution of the distance to the other vessels is proposed. The concept of Inevitable Collision States (ICS) is adopted to identify the states for which no evasive manoeuvre exist. Furthermore, it is implemented into a collision avoidance system for recreational crafts to demonstrate the performance.
Trajectory generation for vessels using a reachability graph (2015)
Blaich, Michael ; Wirtensohn, Stefan ; Reuter, Johannes ; Hahn, Axel
Schadensanalytik an Bauteilen aus nichtrostenden Stählen
Bogatzky, Torsten ; Gümpel, Paul ; Sorg, Matthias
Begrüßung und Vorstellung der Simulationsaktivitäten der HTWG Konstanz (2018)
Bošković, Lazar ; Lege, Burkhard
Towards sensorless control for softlanding of fast-switching electromagnetic actuators (2016)
Braun, Tristan ; Reuter, Johannes
Position observation for proportional solenoid valves by signal injection (2016)
Braun, Tristan ; Reuter, Johannes ; Rudolph, Joachim
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.
A novel observer approach for self sensing of single-coil digital valves (2017)
Braun, Tristan ; Reuter, Johannes ; Rudolph, Joachim
Observer-based self sensing for digital (on–off) single-coil solenoid valves is investigated. Self sensing refers to the case where merely the driving signals used to energize the actuator (voltage and coil current) are available to obtain estimates of both the position and velocity. A novel observer approach for estimating the position and velocity from the driving signals is presented, where the dynamics of the mechanical subsystem can be neglected in the model. Both the effect of eddy currents and saturation effects are taken into account in the observer model. Practical experimental results are shown and the new method is compared with a full-order sliding mode observer.
State estimation for fast-switching solenoid valves (2015)
Braun, Tristan ; Straußberger, Florian ; Reuter, Johannes
Knowing the position of the spool in a solenoid valve, without using costly position sensors, is of considerable interest in a lot of industrial applications. In this paper, the problem of position estimation based on state observers for fast-switching solenoids, with sole use of simple voltage and current measurements, is investigated. Due to the short spool traveling time in fast-switching valves, convergence of the observer errors has to be achieved very fast. Moreover, the observer has to be robust against modeling uncertainties and parameter variations. Therefore, different state observer approaches are investigated, and compared to each other regarding possible uncertainties. The investigation covers a High-Gain-Observer approach, a combined High-Gain Sliding-Mode-Observer approach, both based on extended linearization, and a nonlinear Sliding-Mode-Observer based on equivalent output injection. The results are discussed by means of numerical simulations for all approaches, and finally physical experiments on a valve-mock-up are thoroughly discussed for the nonlinear Sliding-Mode-Observer.
A semilinear distributed parameter approach for solenoid valve control including saturation effects (2015)
Braun, Tristan ; Straußberger, Florian ; Reuter, Johannes ; Preissler, Gabi
In this paper a semilinear parabolic PDE for the control of solenoid valves is presented. The distributed parameter model of the cylinder becomes nonlinear by the inclusion of saturation effects due to the material's B/H-curve. A flatness based solution of the semilinear PDE is shown as well as a convergence proof of its series solution. By numerical simulation results the adaptability of the approach is demonstrated, and differences between the linear and the nonlinear case are discussed. The major contribution of this paper is the inclusion of saturation effects into the magnetic field governing linear diffusion equation, and the development of a flatness based solution for the resulting semilinear PDE as an extension of previous works [1] and [2].
Analysis of corrosion resistance on metastable austenitic stainless chrome nickel steels according to elastic stress (2016)
Bullinger, S. ; Biebrich, K.
Posterbeitrag
Presentation of tests with a dynamometer related to the determination of fuel consumption in the NEDC and WLTC driving cycles and as well related to the dynamic behavior of vehicles (2016)
Butsch, Michael ; Rescigno, Valerio
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.
Theoretical considerations on sweeping process (2016)
Butsch, Michael ; Roșca, Ioan Călin
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.
Support Vector Machines for Classification of Geometric Primitives in Point Clouds (2015)
Caputo, Manuel ; Denker, Klaus ; Franz, Matthias O. ; Laube, Pascal ; Umlauf, Georg
Classification of point clouds by different types of geometric primitives is an essential part in the reconstruction process of CAD geometry. We use support vector machines (SVM) to label patches in point clouds with the class labels tori, ellipsoids, spheres, cones, cylinders or planes. For the classification features based on different geometric properties like point normals, angles, and principal curvatures are used. These geometric features are estimated in the local neighborhood of a point of the point cloud. Computing these geometric features for a random subset of the point cloud yields a feature distribution. Different features are combined for achieving best classification results. To minimize the time consuming training phase of SVMs, the geometric features are first evaluated using linear discriminant analysis (LDA). LDA and SVM are machine learning approaches that require an initial training phase to allow for a subsequent automatic classification of a new data set. For the training phase point clouds are generated using a simulation of a laser scanning device. Additional noise based on an laser scanner error model is added to the point clouds. The resulting LDA and SVM classifiers are then used to classify geometric primitives in simulated and real laser scanned point clouds. Compared to other approaches, where all known features are used for classification, we explicitly compare novel against known geometric features to prove their effectiveness.
Nachhaltigkeit im industriellen Umfeld (2017)
Christ, Patrick ; Bogner, Johanna ; Petry, Christoph ; Ruehle, Meike ; Engelhardt, Xenia ; Hagel, Benjamin ; Hermann, Felix ; Kernatsch, Tom ; Indlekofer, Julian ; Brunner, Yvonne
Im Rahmen der Lehrveranstaltung "Nachhaltigkeit im industriellen Umfeld" im Masterstudiengang Umwelt- und Verfahrenstechnik der Hochschulen Konstanz und Ravensburg-Weingarten fand im Dezember 2016 eine studentische Fachkonferenz statt. Die Studierenden entwickelten in Einzelarbeit oder als Zweierteam Konferenzbeiträge zu folgenden Themen: - Spannendes aus dem Bereich der Energieerzeugung und der Grauen Energie - Aspekte der Kreislaufwirtschaft - Ökosysteme - ihre Belastung und Erhalt - Spezifische Wirtschaftszweige und Nachhaltigkeit Die Ergebnisse der studentischen Fachkonferenz zur „Nachhaltigkeit im industriellen Umfeld“ werden in der vorliegenden Publikation präsentiert.
A review of health monitoring systems using sensors on bed or cushion (2018)
Conti, Massimo ; Orcioni, Simone ; Martínez Madrid, Natividad ; Gaiduk, Maksym ; Seepold, Ralf
A Virtual-Reality 3d-Laser-Scan Simulation (2015)
Danhof, Malvin ; Schneider, Tarek ; Laube, Pascal ; Umlauf, Georg
We present a 3d-laser-scan simulation in virtual reality for creating synthetic scans of CAD models. Consisting of the virtual reality head-mounted display Oculus Rift and the motion controller Razer Hydra our system can be used like common hand-held 3d laser scanners. It supports scanning of triangular meshes as well as b-spline tensor product surfaces based on high performance ray-casting algorithms. While point clouds of known scanning simulations are missing the man-made structure, our approach overcomes this problem by imitating real scanning scenarios. Calculation speed, interactivity and the resulting realistic point clouds are the benefits of this system.
On-line CAD Reconstruction with Accumulated Means of Local Geometric Properties (2015)
Denker, Klaus ; Hamann, Bernd ; Umlauf, Georg
Reconstruction of hand-held laser scanner data is used in industry primarily for reverse engineering. Traditionally, scanning and reconstruction are separate steps. The operator of the laser scanner has no feedback from the reconstruction results. On-line reconstruction of the CAD geometry allows for such an immediate feedback. We propose a method for on-line segmentation and reconstruction of CAD geometry from a stream of point data based on means that are updated on-line. These means are combined to define complex local geometric properties, e.g., to radii and center points of spherical regions. Using means of local scores, planar, cylindrical, and spherical segments are detected and extended robustly with region growing. For the on-line computation of the means we use so-called accumulated means. They allow for on-line insertion and removal of values and merging of means. Our results show that this approach can be performed on-line and is robust to noise. We demonstrate that our method reconstructs spherical, cylindrical, and planar segments on real scan data containing typical errors caused by hand-held laser scanners.
Ulrich Finsterwalder (2016)
Dicleli, Cengiz
Ulrich Finsterwalder (1897-1988) (2017)
Dicleli, Cengiz
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