Results 121 to 130 of about 1,986 (195)

Folding Tiltrotor Technology Demonstrator - The Next Step for Tiltrotor Technology

SAE Technical Paper Series, 1985
<div class="htmlview paragraph">Based on a comparative study of competing V/STOL concepts, the folding tiltrotor offers many advantages for missions requiring long endurance combined with a speed capability in excess of 400 knots. Folding tiltrotor technology development began in 1967 and the results of wind tunnel tests and design studies show ...
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Civil Tiltrotor Aircraft Operations

11th AIAA Aviation Technology, Integration, and Operations (ATIO) Conference, 2011
The goal of the current study is to investigate the benefits and challenges of operating a notional fleet of civil tiltrotor aircraft (10-, 30-, 90-, and 120-passenger vehicles), in the commercial transport role, in the projected Next Generation airspace system.
Larry Young, William Chung, Alfonso Paris, Daniel Salvano, Ray Young, Huina Gao, Victor Cheng, Ken Wright   +7 more
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ESO-based fuzzy adaptive control of tiltrotor UAV against wind disturbance

Transactions of the Institute of Measurement and Control
Tiltrotor unmanned aerial vehicles (UAVs) face significant lateral control challenges during hovering due to their hybrid aerodynamic configuration, making them particularly susceptible to wind disturbances.
Xiaomei Cheng, Yingxun Wang, Jiang Zhao, Ningjun Liu, Zhihao Cai   +4 more
semanticscholar   +1 more source

Aeroelastic analysis of advanced geometry tiltrotor aircraft

36th Structures, Structural Dynamics and Materials Conference, 1995
A tiltrotor model is formulated to predict the dynamics and aeroelastic stability of composite-coupled advanced geometry rotors. Advanced geometry rotor blades are modeled with arbitrary sweep, anhedral, pretwist and planform taper variation with span.
Venkataraman Srinivas, Inderjit Chopra, Mark W. Nixon   +2 more
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Experimental Investigation of Aerodynamic Interaction in Non-Parallel Tandem Dual-Rotor Systems for Tiltrotor UAV

Drones
The distributed electric tilt-rotor Unmanned Aerial Vehicle (UAV) combines the vertical take-off and landing (VTOL) capability of helicopters with the high-speed cruise performance of fixed-wing aircraft, offering a transformative solution for Urban Air ...
He Zhu, Yuhao Du, Hong Nie, Zhiyang Xin, Xi Geng   +4 more
semanticscholar   +1 more source

Tiltrotor Conversion Maneuver Analysis with RCAS

Journal of the American Helicopter Society, 2020
Aeromechanics analysis is performed using the comprehensive analysis code RCAS (Rotorcraft Comprehensive Analysis System) to study the transient conversion maneuver of a tiltrotor. The analytical model is based on the XV-15 research tiltrotor aircraft in size and dynamic characteristics.
Hossein Saberi, Hyeonsoo Yeo
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Experimental Amplitude-Dependent Characterization of the TiltRotor Aeroelastic Stability Testbed

Proceedings of the Vertical Flight Society 81st Annual Forum and Technology Display
This paper investigates the amplitude-dependent characteristics of the TiltRotor Aeroelastic Stability Testbed. The recovery rate, MultiProny, and Stockwell transform methods are employed to measure nonlinear effects in the system, overcoming the ...
Gray Simmons, Andrew R. Kreshock, Robert P. Thornburgh, Cristina Riso, Martin Sekula   +4 more
semanticscholar   +1 more source

Correlation of High-Speed Tiltrotor Stability Predictions with Test Data and Parametric Study

Journal of Aircraft
High-speed stability of tiltrotor was studied. The University of Maryland’s Maryland Tiltrotor Rig (MTR) was chosen for the analysis due to availability of properties and test data, and its interesting high-stability behavior observed in the Glenn L ...
Seyhan Gul, Hyeonsoo Yeo
exaly   +2 more sources

Nonlinear Model Predictive Control of Tiltrotor Quadrotors using Feasible Control Allocation

Journal of Intelligent and Robotic Systems
This paper presents a new flight control framework for tiltrotor multirotor uncrewed aerial vehicles (MRUAVs). Tiltrotor designs offer full actuation but introduce complexity in control allocation due to actuator redundancy.
Zeinab Shayan, Jann Cristobal, Mohammadreza Izadi, Amin Yazdanshenas, Mehdi Naderi, Reza Faieghi   +5 more
semanticscholar   +1 more source

Numerical Evaluation of Gust Loads on Tiltrotor

Proceedings of the Vertical Flight Society 74th Annual Forum and Technology Display, 2018
In aircraft design, the loads induced by atmospheric gust encounters are often critical for airframe structural sizing. Consequently, it is extremely important to develop methods that can predict these loads accurately. Current certification regulations include precise requirements concerning the determination of atmospheric loads.
RIGO, ALBERTO, Favale, M., Trezzini, A. A., Quaranta, G.   +3 more
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