Results 111 to 120 of about 2,332 (184)

Optimum Design of High Speed Prop-Rotors [PDF]

open access: yes
The objective of this research is to develop optimization procedures to provide design trends in high speed prop-rotors. The necessary disciplinary couplings are all considered within a closed loop optimization process.
Chattopadhyay, Aditi
core   +1 more source

NDARC-NASA Design and Analysis of Rotorcraft Theoretical Basis and Architecture [PDF]

open access: yes, 2010
The theoretical basis and architecture of the conceptual design tool NDARC (NASA Design and Analysis of Rotorcraft) are described. The principal tasks of NDARC are to design (or size) a rotorcraft to satisfy specified design conditions and missions, and ...
Johnson, Wayne
core   +1 more source

Tiltrotor research aircraft composite blade repairs: Lessons learned [PDF]

open access: yes
The XV-15, N703NA Tiltrotor Research Aircraft located at the NASA Ames Research Center, Moffett Field, California, currently uses a set of composite rotor blades of complex shape known as the advanced technology blades (ATBs). The main structural element
Espinosa, Paul S., Groepler, David R.
core   +1 more source

Performance of Advanced Heavy-Lift, High-Speed Rotorcraft Configurations [PDF]

open access: yes, 2007
The aerodynamic performance of rotorcraft designed for heavy-lift and high-speed cruise is examined. Configurations considered include the tiltrotor, the compound helicopter, and the lift-offset rotor. Design conditions are hover and 250-350 knot cruise,
Acree, C. W., Jr.   +2 more
core   +1 more source

A Resilient Approach to a Test Rig Setup in the Qualification of a Tilt Rotor Carbon Fiber-Reinforced Polymer (CFRP) Wing

open access: yesAerospace
The evolution of aircraft wing development has seen significant progress since the early days of aviation, with static testing emerging as a crucial aspect for ensuring safety and reliability.
Pasquale Vitale   +6 more
doaj   +1 more source

Accessibility Design and Operational Considerations in the Development of Urban Aerial Mobility Vehicles and Networks [PDF]

open access: yes
Urban aerial mobility vehicles and networks have recently gained considerable interest in the aviation community. These small, short-range vehicles with all-electric or hybrid-electric propulsion systems, tailored to metropolitan aerial transportation ...
Young, Larry A.
core   +1 more source

Threats from and Countermeasures for Unmanned Aerial and Underwater Vehicles. [PDF]

open access: yesSensors (Basel), 2022
Khawaja W   +5 more
europepmc   +1 more source

Design of an air traffic computer simulation system to support investigation of civil tiltrotor aircraft operations [PDF]

open access: yes
This research project addresses the need to provide an efficient and safe mechanism to investigate the effects and requirements of the tiltrotor aircraft's commercial operations on air transportation infrastructures, particularly air traffic control. The
Rogers, Ralph V.
core   +1 more source

The "Yin-Yang Grid": An Overset Grid in Spherical Geometry

open access: yes, 2004
A new kind of overset grid, named Yin-Yang grid, for spherical geometry is proposed. The Yin-Yang grid is composed of two identical component grids that are combined in a complemental way to cover a spherical surface with partial overlap on their ...
Akira Kageyama   +46 more
core   +1 more source

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