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Das Software-Engineering sollte nicht nur über das Aufzählen von Aktivitäten charakterisiert, sondern zusätzlich auch über grundsätzliche Probleme motiviert werden. Die Beschäftigung mit dem Warum des Software-Engineerings erhält so mehr Gewicht gegenüber dem Wie. Mit der Betonung des Problembewusstseins nährt man auch weniger das Missverständnis, das Software-Engineering diene hauptsächlich der Disziplinierung von Software- Entwicklern. Es geht eben nicht in erster Linie darum, sich in ein Vorgehensmodell einzufügen und eine Aktivität nach der anderen regelkonform mit den vorgesehenen Werkzeugen abzuarbeiten. Vielmehr sind Spürsinn, Kreativität und Urteilsvermögen gefragt. Denn die genannten grundsätzlichen Probleme sind zwar in jedem Projekt allgegenwärtig, aber trotzdem nicht unbedingt auf den ersten Blick erkennbar, und sie müssen mangels echter Lösungen immer neu mit angemessenen Kompromissen bewältigt werden. Dabei ist Nützlichkeit der Maßstab, nicht Wahrheit. Das alles ist herausfordernd und Herausforderungen machen Spaß.
Im vorliegenden Aufsatz werden die rechnerischen Rissbreiten bei frühem und bei spätem Zwang verglichen. Insbesondere wird der Fall betrachtet, dass nach einer frühen Rissbildung infolge Abfließens der Hydratationswärme im fortgeschrittenen Betonalter Zwängungen durch Schwinden und/oder Temperatureinflüsse entstehen. Es wird gezeigt, dass die im jungen Betonalter entstandenen Risse zunächst breiter werden, bevor neue Risse infolge späten Zwangs entstehen können, und dass die resultierende Rissbreite dann größer ist, als wenn die Risse ausschließlich durch späten Zwang entstehen. Für die rechnerische Behandlung dieser Problematik wird ein einfaches Rechenverfahren aufgezeigt. Des Weiteren wird auf die Konzentration von zwangsbedingten Rissen in Schwachstellen, z. B. bei Bodenplatten und Decken mit großen Aussparungen, eingegangen und es wird dargestellt, wie für solche Bauteilgeometrien die rechnerische Begrenzung der Rissbreite erfolgen kann.
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)