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Die Wichtigkeit des Faches FEM ist sicher unumstritten. Um in der gegebenen Zeit eine ausreichende Einarbeitung in die Methode und die Uebung am Rechner durchfuehren zu koennen, ist der Einsatz eines auf PC lauffaehigen FE-Lernprogramms eine gute Hilfe. Sind die Grundlagen da, weiss der Student, welche Eingaben bei einem FE-Programm zu machen sind. Fuer manche Fachgebiete genuegt schon die Arbeit mit einem solchen Programm. Sind entsprechende Uebungen mit dem Lernprogramm erfolgt, kann auf professionellen Programmen wie z.B. CAEDS das Zusammenspiel CAD/FEM ernsthaft betrieben werden. Es sollte ein Fachsemester ausgesucht werden, in dem CAD und FE angeboten wird. Dieses Fachsemester sollte, um den Nutzen der FEM in moeglichst vielen Fachgebieten zu haben, zum Ende des Grundstudiums, spaetestens aber zu Beginn des Hauptstudiums liegen.
An investigation is underway regarding the usefulness of altazimuth-mounting telescopes' incorporation of laser gyros for pointing and fiber gyros with extremely small random-walk coefficient for telescope inertial stabilization during tracking. A star tracker is expected to help stabilize long-term gyro bias. Gyro and telescope specifications have been derived by means of computer simulations and systems analyses.
Bei thermischen Konvektionsströmungen ist der Einfluß von Geometrie und Randbedingungen für die Strömungsform und den konvektiven Wärmetransport von wesentlicher Bedeutung. Mit Hilfe der optischen Strömungsmeßtechnik (Differentialinterferometrie) wurde die freie Konvektion in einem quaderförmigen Behälter mit seitlicher Beheizung untersucht. Der Aufbau und die Experimente werden beschrieben. Die quantitative Auswertung von Dichte- und Temperaturfeldern aus den Differentialinterferogrammen wird aufgezeigt und der Einfluß unterschiedlicher Randbedingungen wie feste und freie Oberfläche auf die Strömungsform und den Wärmetransport dargelegt. Die eingesetzte Differentialinterferometrie zeigt aufgrund ihrer Anpassungsfähigkeit an die jeweiligen Versuchsbedingungen und durch den einfachen Aufbau spezifische Vorteile gegenüber dem Mach-Zehnder Interferometer.
Bei einem neuen Kühldeckensystem wird die Luft im Deckenhohlraum oberhalb der abgehängten Decke durch Konvektoren gekühlt, wobei die Wärmeübertragung ausschließlich durch freie Konvektion und Strahlung erfolgt. Die abgehängte Decke nimmt durch Strahlung und freie Konvektion Wärme aus dem darunterliegenden Büroraum auf und gibt sie über freie Konvektion an die Luft im Deckenhohlraum sowie durch Strahlung an die Begrenzungsflächen des Deckenhohlraumes ab. Die vom Kühlwasser durchströmten Rippenrohre nehmen ihrerseits Wärme aus der Luft im Hohlraum auf, die infolge der freien Konvektion durch die Rippenrohre strömt. Zur Aufnahme des bei starker Belastung und Dauerbetrieb anfallenden Kondensats ist unterhalb des Konvektors eine Kondensatauffangwanne angebracht. Mit dem von Rutsch erstellten Rechenprogramm ist es möglich, für verschiedenste Randbedingungen die Rippenrohre auf maximale Kühlleistung zu optimieren. Voraussetzung für die direkte Anwendung dieses Berechnungsverfahrens sind jedoch ungestörte An- und Abströmbedingungen der Luft am Konvektor. Neben der Optimierung der Rippenrohre auf Kühlleistung ist für den Aufbau der eigentlichen Decke die Luftströmung im Deckenhohlraum und die Austrittstemperatur aus den Konvektoren von entscheidender Bedeutung. Die maximale Kühlleistung der Rippenrohre kann nur erreicht werden, wenn alle Einzelrippenrohre nahezu gleichmäßig durchströmt werden und günstige Abströmverhältnisse vorhanden sind. Die Strömungsverhältnisse im Deckenhohlraum und innerhalb der Konvektoren wurden durch Rauch sichtbar gemacht und auf Video aufgezeichnet. Entscheidenden Einfluß auf die Temperaturverteilung an der Kühldecke haben die Breite des Konvektors, die Konstruktion der Kondensatauffangwanne, der Abstand der Konvektoren voneinander und der Konvektortyp. Direkt unterhalb der Kondensatauffangwanne beträgt die Temperaturdifferenz ca. 3 K. Der Temperaturgradient im Abströmbereich liegt bei ca. 0,2 bis 0,3 K/m.
A polarization mode dispersion measurement set-up based on a Mach-Zehnder Interferometer was realized. Measurements were carried out on short high-birefringent fibers and on long standard telecommunication single-mode fibers. In order to ensure high accurate results, special emphasis was placed on the evaluation of the interference pattern. The procedure will be described in detail and practical measurement results will be presented.
The prototype of an optical gyro encoder (OGE) has been successfully tested on the NTT telescope in September '93. The OGE consists of a ring laser gyro and a fiber optic gyro with their input axis parallel. The gyro outptu signals are compensated for earth rotation and misalignment and are subsequently integrated to get the angles. An adaptive digital control loop locks the fiber optic gyro to the laser gyro data. Thus the combined output has the precision of the laser gyro and the low noise of the fiber optic gyro. Specifically, the bias stability is better than 2 X 10-3 deg/h, the scale factor accuracy better than 1 ppm, the random walk coefficient better than 5 X 10-4 deg/(root)h and the resolution better than 3 X 10-4 arcsec. The OGE has been mounted in the altitude and in the azimuthy axis of the telescope. The data were compared with the telescope disk encoder data. The test data show that the pointing accuracy is about 1 arcsec and the tracking accuracy 0.1 arcsec over a time of 30 seconds. This accuracy is sufficient for the very large telescope, for instance.
This paper treats the Brillouin backscattering in a single mode optical fiber and its implications on the Brillouin Ring Laser Gyroscope (BRLG). The BRLG consists of a fiber ring cavity in which stimulated Brillouin scattering is induced and provides two resonant counterpropagating backscattered waves. If this cavity is rotating around its axis, the backscattered waves get different resonant frequencies because of the Sagnac effect. The frequency difference is proportional to the rotation rate (Omega) by inducing a frequency offset between the counterpropagating waves. Some reported Brillouin spectra exhibit several peaks, which means that one pump wave provides at least two backscattered waves with distinguishable frequencies. In order to understand this multi-backscattering and to take advantage of it for the BRLG, we present results of a simulation of the Brillouin backscattering in a single mode optical fiber.
Massiv- Heiz-/Kühldecken bestehen im wesentlichen aus in der tragenden Deckenkonstruktion eingegossenen Kunststoffrohren, die je nach Jahreszeit von Heiz- bzw. Kühlwasser durchströmt verden. Das instationäre Verhalten wurde mit dem Anlagen und Simulationsprogramm TRNSYS untersucht. Anhand ausgesuchter Ergebnisse können die Anforderungen an die notwendigen Regelkonzepte abgeleitet werden. Es eignen sich für derartige Systeme, insbesondere wegen ihrer großen Speicherfähigkeit und damit Trägheit, modifizierende selbstadaptierende Regler. Aufgrund der großen Trägheit der Massivdecke ist eine direkte außentemperaturgeführte Vorlauftemperaturregelung des Wasserstromes nicht sinnvoll. Es sollte ein selbstadaptierendes Regelsystem verwendet werden, das anhand der vorangegangenen Lastverläufe die Gebäudekonstante und damit das Speicherverhalten der Räume ermittelt. Damit der Regelaufwand reduziert werden kann, sollen mehrere Räume als Gruppe zusammengefaßt werden. Als weitere Größe für das Regelkonzept ist die Speichertemperatur am Ende der Ladezeit zu messen und in das Programm mit einzubinden.
Die Untersuchungen wurden im Raumlufttechnischen Labor der Fachhochschule Offenburg zur Beurteilung der Effizienz der Schadstoffabfuhr unter Einhaltung der thermischen Behaglichkeit beim Einsatz verschiedener Luftführungssysteme- Quellauslaß, Deckendrallauslaß und Fußbodenauslaß- in Verbindung mit einer Kühldecke durchgeführt. Die Ergebnisse zeigen, daß keine signifikanten Vorteile für ein bestimmtes RLT-Konzept bestehen. Je nach Wahl der Randbedingungen der Untersuchungen liegen die erreichbaren Kühlleistungen innerhalb einer Systemkombination weiter auseinander als im Verhältnis zu den Vergleichssystemen. Insgesamt ist hinsichtlich der von beiden Systemen zusammen abgebbaren, maximalen Kühlleistung die Kombination Kühldecke mit Deckendralluftauslaß vorteilhaft.
Vortex breakdown phenomena in rotating fluids are investigated both theoretically and experimentally. The fluid is contained in a cone between two spherical surfaces. The primary swirling motion is induced ba the rotating lower boundary. The upper surface can be fixed with non-slip condition or can be a stress-free surface. Depending on these boundary conditions and on the Reynolds number, novel structures of recirculation zones are realized. The axisymmetric flow patterns are simulated numerically by a finite difference method. Experiments are done to visualize the topological structure of the flow pattern and to observe the existence ranges of the different recirculating flows. The comparison between theory and experiment shows good agreement with respect to the topological structure of the flow.