Abstract Electrical propulsion has been identified as one of the key fields future research within aerospace sector. The Institute Aeronautical Engineering at Universität der Bundeswehr München aims to contribute ongoing development small-sized electrical ducted fan engines with a thrust in range 100 N. A special emphasis is placed on electrically powered contra-rotating stages. When compared c...

BACKGROUND A common measure of rehabilitation effectiveness post-stroke is self-selected walking speed, yet individuals may achieve the same speed using different coordination strategies. Asymmetry in the propulsion generated by each leg can provide insight into paretic leg coordination due to its relatively strong correlation with hemiparetic severity. Subjects walking at the same speed can ex...

D ETONATION, a shock-induced combustion process in which the heat releasemakes a strong contribution to the support of the lead shock, is one of the most rapid chemical energy release processes in nature. For self-sustained detonations propagating in gases initially at atmospheric pressure and temperature, energy release rates approaching 10 W=m are not uncommon, and propagation velocities on t...

In this article, we describe the research and development of a 3 kV active rectifier for 4 MW aerospace generator drive system demonstrator. The converter is fed by multiphase high-speed/high-frequency permanent magnet generator. main aim work to demonstrate first time feasibility an MW-class meeting future hybrid-electric propulsion requirements. A concept with multiple isolated three-phase sy...

An investigation of the conversion from anode electrical energy to jet kinetic energy in a laboratory model Hall thruster yielded an experimentally determined thrust efficiency that was analytically decomposed into the product of propellant, voltage, and current utilization efficiency. This method accounts for loss of propellant utilization from plume divergence, unionized propellant, and multi...

The purpose of this study was to (1) evaluate the mechanical efficiency (ME) of two commercially available lever-propulsion mechanisms for wheelchairs and (2) compare the ME of lever propulsion with hand rim propulsion within the same wheelchair. Of the two mechanisms, one contained a torsion spring while the other used a roller clutch design. We hypothesized that the torsion spring mechanism w...

* NRC Research Associate, Turbomachinery and Propulsion System Division, Member AIAA. Located at Ohio Aerospace Institute ICOMP, 22800 Cedar Point Rd., Cleveland, OH 44142, USA = Senior Scientist, Turbomachinery and Propulsion System Division, Associate Fellow AIAA # Associate Professor, Institute of Fluid Science, Associate Fellow AIAA Copyright © 2002 by the American Institute of Aeronautics ...

1 , A. Stroupe 2 , H. Aghazarian 3 , M. Garrett 4 , P. Younse 5 , and M. Powell 6 . 1 Jet Propulsion Laboratory, MS 198-219, 4800 Oak Grove Drive, Pasadena, CA 91109, [email protected]; 2 Jet Propulsion Laboratory, MS 198-219, 4800 Oak Grove Drive, Pasadena, CA 91109, [email protected]; 3 Jet Propulsion Laboratory, MS 198219, 4800 Oak Grove Drive, Pasadena, CA 91109, Hran...