Distributed electric propulsion and boundary layer ingestion are two attractive technologies to reduce the power consumption of fixed wing aircraft. Through careful distribution propulsive system elements, higher aerodynamic efficiency can be achieved, as well a lower risk total loss aircraft due foreign object damage. When used on wing, further reductions bending moment root even lead its stru...

As small rotorcraft grow in capability, the possibilities for their application increase dramatically. Many of these new applications require stable outdoor flight, necessitating a closer look at the aerodynamic response of the aircraft in windy environments. This paper develops the equations of motion for a single-propeller test stand by analyzing the blade-flapping response of a small-stiff p...

In this paper, we design an attractivealgorithm aiming to classify moving targets includinghuman, animal, vehicle and drone, at groundsurveillance radar systems. The non-stationary reflectedsignal of the targets is represented with a novelmathematical framework based on behavior of thesignal components in reality. We further propose usingthe generalized linear chirp transform for the analysisst...

In this paper an analytic method is used to solve for the cross spectral density of the interior acoustic response of a cylinder with nonuniform thickness subjected to turbulent boundary layer excitation. The cylinder is of honeycomb core construction with the thickness of the core material expressed as a cosine series in the circumferential direction. The coe cients of this series are used as ...

The study proposes the use of a new generation aircraft based on cylindrical rotating blade propellers as means transportation. results research and development work carried out several dimensions are considered. obtained allow us to lay down certain basis for theory practice operation propellers. In process scientific research, an understanding role geometric ratios rotor elements number blade...

Abstract Turbo-electric Distributed Propulsion (TeDP) is a promising concept to achieve the operational goals of more electric aircraft. The application TeDP architecture can desired weight reduction an aircraft power system. use superconducting machine expected provide workaround for issue, but its current state technology has not yet been extensively tested applications. Another practical opt...

In the context of development high-speed compound helicopters, main rotor may not be an efficient propulsive device at high speeds and adding a propeller is means to enable higher speed. On such configuration, low speed, propellers are in strong interactions with wake which affects their performance aircraft maneuverability. The present work numerically investigates aerodynamics rotor/propeller...

1EPA 2Printed on paper that contains at least 30 percent postconsumer fiber. 1 This fact sheet focuses on contrails produced by aircraft engine exhaust. However, the term " contrail " is also used to refer to the short trails sometimes briefly appearing over aircraft wings or engine propellers, especially under mild, humid conditions. These contrails consist entirely of atmospheric water that c...

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