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In automotive a lot of electromagnetically, pyrotechnically or mechanically driven actuators are integrated to run comfort systems and to control safety systems in modern passenger cars. Using shape memory alloys (SMA) the existing systems could be simplified, performing the same function through new mechanisms with reduced size, weight, and costs. A drawback for the use of SMA in safety systems is the lack of materials knowledge concerning the durability of the switching function (long-time stability of the shape memory effect). Pedestrian safety systems play a significant role to reduce injuries and fatal casualties caused by accidents. One automotive safety system for pedestrian protection is the bonnet lifting system. Based on such an application, this article gives an introduction to existing bonnet lifting systems for pedestrian protection, describes the use of quick changing shape memory actuators and the results of the study concerning the long-time stability of the tested NiTi-wires. These wires were trained, exposed up to 4years at elevated temperatures (up to 140°C) and tested regarding their phase change temperatures, times, and strokes. For example, it was found that A P-temperature is shifted toward higher temperatures with longer exposing periods and higher temperatures. However, in the functional testing plant a delay in the switching time could not be detected. This article gives some answers concerning the long-time stability of NiTi-wires that were missing till now. With this knowledge, the number of future automotive applications using SMA can be increased. It can be concluded, that the use of quick changing shape memory actuators in safety systems could simplify the mechanism, reduce maintenance and manufacturing costs and should be insertable also for other automotive applications.
Während jeder Phase der touristischen Wertschöpfungskette spielen Wahrnehmungsprozesse eine relevante Rolle. Sofern es sich nicht um einen Wiederholungsbesucher handelt, kann der potenzielle Tourist zunächst nur auf das Image, das Fremdbild einer Destination, zurückgreifen, das nicht nur durch Tourismusmarketing, sondern auch durch andere Wahrnehmungsprozesse geformt wurde: immer wenn die Destination Gegenstand in einem Film, einer Nachrichtensendung oder einem Buch ist, trägt dies dazu bei, das Image zu formen. Somit ist nur ein Teil der touristischen Wahrnehmung vor der Reise eine durch Tourismusmarketing gesteuerte. Das Image oder Bild, das ein potenziell Reisender von einer Destination hat, kann somit über Jahre hinweg aufgebaut worden sein, durch Verbindung sämtlicher Eindrücke von ihr, die er im Laufe seines Lebens gesammelt hat. Diese inneren Bilder können individuell abweichen, weisen aber in vielen Fällen kollektive Gemeinsamkeiten auf (z. B. wird Paris mehrheitlich mit Romantik, mit der Südsee das Paradies und Berlin mit Party verbunden). Während und nach der Reise sucht der Tourist die Bestätigung dieser inneren Bilder – sie erweisen sich als persistent auch gegenüber der Realität. Diese Art der touristischen Wahrnehmung wird von Hennig (1997) treffend mit dem Begriff der „Imaginären Geographie“ beschrieben und soll daher zentraler Bezugspunkt dieses Beitrages sein. Angewendet wird dieses Konzept auf das Fallbeispiel Sevilla. Ziele des Beitrages sind daher:
- Aufzeigen des Erklärungspotenzialsdes Konzepts der „Imaginären Geographie“ von Christoph Hennig für touristische Wahrnehmungsprozesse
- Darstellung der Rolle der touristischen Intermediäre klassischer und neuer Reisemedienanhand des Fallbeispiels Sevilla
- Erläuterung des Bezugs der „Imaginäre Geographien“ (und verwandter Ansätze) zur Praxis (hier Fallbeispiel Sevilla)
The effect on the mean-variance space of restrictions on a variable is investigated in this
paper. A restriction may be the placing of upper and lower bounds on a variable.
Another limitation is the loss of the continuity of a variable.
Average marks for Examinations are considered in an application of this limited meanvariance
space. In this case, the bounds are given by the highest and the lowest possible mark (e.g. 1.0 and 5.0). The limitation of the mean-variance space depends on the number of students who participate in the examination. The restriction of the loss of continuity is shown by the use of discrete marks (e.g. 1.0, 1.3, 1.7, 2.0, …). Furthermore,
the Target-Shortfall-Probability lines are integrated into the mean-variance space. These
lines are used to indicate the proportion of students who have good or very good marks in the examination. In financial markets, Target-Shortfall-Probability is used as a risk criterion.
Characterization of NiTi Shape Memory Damping Elements designed for Automotive Safety Systems
(2014)
Actuator elements made of NiTi shape memory material are more and more known in industry because of their unique properties. Due to the martensitic phase change, they can revert to their original shape by heating when subjected to an appropriate treatment. This thermal shape memory effect (SME) can show a significant shape change combined with a considerable force. Therefore such elements can be used to solve many technical tasks in the field of actuating elements and mechatronics and will play an increasing role in the next years, especially within the automotive technology, energy management, power, and mechanical engineering as well as medical technology. Beside this thermal SME, these materials also show a mechanical SME, characterized by a superelastic plateau with reversible elongations in the range of 8%. This behavior is based on the building of stress-induced martensite of loaded austenite material at constant temperature and facilitates a lot of applications especially in the medical field. Both SMEs are attended by energy dissipation during the martensitic phase change. This paper describes the first results obtained on different actuator and superelastic NiTi wires concerning their use as damping elements in automotive safety systems. In a first step, the damping behavior of small NiTi wires up to 0.5 mm diameter was examined at testing speeds varying between 0.1 and 50 mm/s upon an adapted tensile testing machine. In order to realize higher testing speeds, a drop impact testing machine was designed, which allows testing speeds up to 4000 mm/s. After introducing this new type of testing machine, the first results of vertical-shock tests of superelastic and electrically activated actuator wires are presented. The characterization of these high dynamic phase change parameters represents the basis for new applications for shape memory damping elements, especially in automotive safety systems.
Noteninflation
(2014)
Flash-Speicher wurden ursprünglich als Speichermedium für Digitalkameras entwickelt, finden inzwischen aber in vielen Bereichen Anwendung.
Die in Konstanz ansässige Firma Hyperstone GmbH ist ein führender Anbieter von Flashcontrollern für Anwendungen mit erhöhten Anforderungen an Zuverlässigkeit und Datenintegrität. Bereits seit April 2011 kooperiert die Firma Hyperstone mit der HTWG Konstanz bei der Entwicklung von Fehlerkorrekturverfahren für einen zuverlässigen Einsatz von Flash-Speichern. Aufgrund der rasanten Entwicklung bei Flashspeicherbausteinen ist auch eine stetige Weiterentwicklung der Korrekturverfahren notwendig. Im Rahmen dieser Kooperation wurde inzwischen zwei Flashcontroller mit sehr leistungsfähiger Fehlerkorrektur entwickelt. Der folgende Artikel gibt Einblick in den Einsatz von Flash-Speichern und erläutert die Notwendigkeit für eine leistungsfähige Fehlerkorrektur.