Results 61 to 70 of about 191,773 (209)

Active Disturbance Rejection Flight Control and Simulation of Unmanned Quad Tilt Rotor eVTOL Based on Adaptive Neural Network

Drones
The unmanned quad tilt-rotor eVTOL (QTRV) is a variable-configuration aircraft that combines the features of vertical takeoff and landing (VTOL), hovering, and high-speed cruising, making its control system design particularly challenging.
Bohai Deng, Jinfa Xu, Xingyu Yuan, Shengxin Yu   +3 more
doaj   +1 more source

Application of a helicopter mathematical model to the Langley differential maneuvering simulator for use in a helicopter/fighter evasive maneuver study [PDF]

A real time simulation study was conducted using a differential maneuvering simulator to determine and evaluate helicopter evasive maneuvers when attacked by fighter aircraft.
Ashworth, B. R., Baker, D. R., Houck, J. A.   +2 more
core   +1 more source

Fuzzy uncertainty modelling for project planning; application to helicopter maintenance [PDF]

, 2012
Maintenance is an activity of growing interest specially for critical systems. Particularly, aircraft maintenance costs are becoming an important issue in the aeronautical industry. Managing an aircraft maintenance center is a complex activity.
Haït, Alain, Masmoudi, Malek
core   +1 more source

HELICOPTER KIT

, 2018
A kit (1) for a helicopter (2) is described, the helicopter (2) comprising a fuselage (3) and a rotor (4); the kit (1) comprises at least one device (15) adapted to dampen the vibrations transmitted from the rotor (4) to the fuselage (2) and to be interposed between the fuselage (2) and the rotor (4); the device (15), in turn, comprises a first ...
Bottasso, Luigi, Colombo, Attilio, Masarati, Pierangelo, Quaranta, Giuseppe, Tamer, Aykut   +4 more
openaire   +3 more sources

Effect of Dynamic Tilting Speed on the Flow Field of Distributed Multi-Propeller Tilt-Wing Aircraft During Transition Flight

Machines
Advances in distributed electric propulsion and urban air mobility technologies have spurred a surge of research on electric Vertical Take-Off and Landing (eVTOL) aircraft.
Jiahao Zhu, Yongjie Shi, Taihang Ma, Guohua Xu, Zhiyuan Hu   +4 more
doaj   +1 more source

Study of operational parameters impacting helicopter fuel consumption [PDF]

A computerized study of operational parameters affecting helicopter fuel consumption was conducted as an integral part of the NASA Civil Helicopter Technology Program.
Cross, J. L., Stevens, D. D.
core   +1 more source

New Progress in Research on Dynamic Stall of Helicopter Rotors

Nanjing Hangkong Hangtian Daxue Xuebao
For over half a century， rotor dynamic stall has remained a key research focus and challenge in helicopter aerodynamics. Through persistent and in-depth exploration， researchers have achieved significant progress in measurement and prediction of rotor ...
JING Simeng, ZHAO Qijun, YANG Liuqing, GAO Yuan, ZHAO Guoqing   +4 more
doaj   +1 more source

A Novel Model-Free Robust Control of Cable-Driven Manipulators

IEEE Access, 2019
A novel model-free robust control is developed for cable-driven manipulators in this work. Using the time-delay estimation (TDE) to estimate system dynamics, an attractive model-free structure is ensured.
Yaoyao Wang, Sihua Meng, Feng Ju, Bai Chen, Hongtao Wu   +4 more
doaj   +1 more source

Development of an unsteady aerodynamics model to improve correlation of computed blade stresses with test data [PDF]

, 1985
A reliable rotor aeroelastic analysis operational that correctly predicts the vibration levels for a helicopter is utilized to test various unsteady aerodynamics models with the objective of improving the correlation between test and theory.
Gangwani, S. T.
core   +1 more source

Effects of Leading Edge Radius on Stall Characteristics of Rotor Airfoil

Aerospace
The effects of leading edge radius on the static and dynamic stall characteristics of rotor airfoils are investigated. Initially, a parametric airfoil (PARFOIL) method is employed to generate four morphed airfoils with different leading edge radii based ...
Simeng Jing, Guoqing Zhao, Yuan Gao, Qijun Zhao   +3 more
doaj   +1 more source