The velocity field of a representative helicopter fuselage in a free stream is computed. Perturbation velocities due to the fuselage are computed in a plane above the location of the helicopter rotor (rotor removed). The velocity perturbations computed by a source-panel model of the fuselage are compared with experimental measurements taken with a laser velocimeter. Three paneled fuselage models are studied: fuselage shape, fuselage shape with hub shape, and a body of revolution. The velocity perturbations computed for both fuselage shape models agree well with the measured velocity field except in the close vicinity of the rotor hub. In the hub region, without knowing the extent of separation, modeling of the effective source shape is difficult. The effects of the fuselage perturbations are not well-predicted with a simplified ellipsoid fuselage. The velocity perturbations due to the fuselage at the plane of the measurements have magnitudes of less than 8 percent of free-stream velocity. The velocity perturbations computed by the panel method are tabulated for the same locations at which previously reported rotor-inflow velocity measurements were made. Keywords: Helicopter fuselage: Rotor inflow: Source panel: Laser velocimeter. (jhd).
"HELP! Wild crazy girl with free spirit being held prisoner in boring middle school. Applications accepted from tall, good-looking male rescuers only." Amy giggled as she read my card aloud. "Wow, that's cute, Jo. But you aren't really going to send it are you?" "Why not?" I asked. I attached the postcard to a red helium-filled balloon. "But what if somebody finds it?" "What if somebody does?"
Development of advanced rotorcraft configurations has highlighted a need for high-quality experimental data to support the development of flexible and accurate analytical design tools. To provide this type of data, a test program was conducted in the Langley 14- by 22-Foot Subsonic Tunnel to measure the flow near the empennage of a 15-percent scale powered helicopter model with an operating tail fan. Three-component velocity profiles were measured with laser velocimetry (LV) one chord forward of the horizontal tail for four advance ratios to evaluate the effect of the rotor wake impingement on the horizontal tail angle of attack. These velocity data indicate the horizontal tail can experience unsteady angle of attack variations of over 30 degress due to the rotor wake influence. The horizontal tail is most affected by the rotor wake above advance ratios of 0.10. Velocity measurements of the flow on the inlet side of the tail fan were made for a low-speed flight condition using conventional LV techniques. The velocity data show an accelerated flow near the tail fan duct, and vorticity calculations track the passage of main rotor wake vortices through the measurement plane.
Development of advanced rotorcraft configurations has highlighted a need for high-quality experimental data to support the development of flexible and accurate analytical design tools.
proceedings of the 9th International Symposium, held at Bonn, 10-15 September 1990
The wide coverage of the recent international meeting at Bonn on high energyspin physics is reflected in this proceedings volume. Not only are fundamental and theoretical spin phenomena included but also technological developments in polarized beams and targets, and, for the first time, intermediate energy spin physics with electron machines. Highlights include the work on polarized high energy electron beams at LEP and TRISTAN, discussion of the failure of the standard model inconnection with spin phenomena, in particular the growth of the spin asymmetry in violent proton-proton scattering, the presentation of different models to account for the still-unsolved "proton spin crisis,"and proposals for four different experiments to determine the spin structurefunctions.
In just few years, case-based reasoning has evolved from a research topic studied at a small number of specialized academic labs into an industrial-strength technology applied in various fields. The INRECA methodology presented in detail in this monograph provides a data analysis framework for developing case-based reasoning solutions for successful applications in real-world industrial contexts. The book is divided into parts on: - smarter business with case-based decision support; - developing case-based applications using the INRECA methodology; and - using the methodology in various application domains. The book provides a self-contained introduction to case-based reasoning applications that address both R&D professionals and general IT managers interested in this powerful new technology. In this second edition, improvements and updates have been incorporated throughout the text. Particularly useful is the systematic coverage of experience factory applications at various steps; and, of course, the references have been extended substantially.
Der empirischen Untersuchung lag die Fragestellung zugrunde, ob delinquentes Verhalten im Rahmen pathologischen Glücksspiels durch das süchtige Spielverhalten bedingt ist. Um der Vielschichtigkeit des kriminologischen Geschehens und seiner Entstehung gerecht zu werden, wurden auf der Grundlage eines täterorientierten Mehrfaktorenansatzes weitere potentielle kriminogene Bedingungsfaktoren wie Persönlichkeits- und soziale Bindungsmerkmale einbezogen. Die Datenerhebung erfolgte an Stichproben von SpielerInnen aus Behandlungseinrichtungen sowie aus der Bevölkerung und der Bundeswehr. Es zeigt sich, dass sowohl das süchtige Spielverhalten als auch die Persönlichkeitsmerkmale direkten Einfluss auf die Delinquenzbelastung nehmen. Bei Eigentums- und Vermögensdelikten ist der direkte kausale Effekt des Suchtverhaltens größer als der der Persönlichkeit. Der Bedeutungsgehalt der aufgezeigten Risikofaktoren variiert in einzelnen identifizierbaren Subgruppen pathologischer SpielerInnen (Neuland).
Der empirischen Untersuchung lag die Fragestellung zugrunde, ob delinquentes Verhalten im Rahmen pathologischen Glucksspiels durch das suchtige Spielverhalten bedingt ist.
