Results 221 to 230 of about 3,220 (257)

Tilt Rotor Broadband Hover Aeroacoustics

Journal of Fluids Engineering, 1993
To improve the acoustic characteristics of tilt rotor aircraft, the dominant noise mechanisms must be understood. Toward this goal, a method was developed to identify and predict the dominant broadband noise mechanism of a hovering tilt rotor. Predictions are presented for a range of azimuthal observer locations and polar observer angles and are ...
C. D. Coffen, A. R. George
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Modeling and control of tilt-rotor aircraft

2016 Chinese Control and Decision Conference (CCDC), 2016
In this paper, a flight dynamics model of a tiltrotor aircraft is developed used basic equations of motion. This model focuses on control aspect of tiltrotor and is able to show inherent tiltrotor characteristics; then a flight control system is designed used novel L1 adaptive control theory.
Ke Lu, Chunsheng Liu, Zhengzhong Wang, Weihong Wang   +3 more
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Fault tolerance analysis of a hexarotor with reconfigurable tilted rotors

2020 IEEE International Conference on Robotics and Automation (ICRA), 2020
Tilted rotors in multirotor vehicles have shown to be useful for different practical reasons. For instance, increasing yaw maneuverability or enabling full position and attitude control of hexarotor vehicles. It has also been proven that a hexagon-shaped multirotor is capable of complete attitude and altitude control under failures of one of its rotors.
Claudio D. Pose, Juan Ignacio Giribet, Ignacio Mas   +2 more
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Inverse simulation of unconventional maneuvers for a quadcopter with tilting rotors

IFAC Proceedings Volumes, 2013
Abstract An inverse simulation algorithm is applied to the determination of the control laws for tracking desired maneuvers by means of an unconventional quad-rotor configuration. This novel configuration features four rotors that are allowed to tilt around the axis of the support, thus changing the thrust vector direction in order to achieve ...
Piacenza I. A., GIULIETTI, FABRIZIO, Avanzini G.   +2 more
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State-Dependent LQR Control for a Tilt-Rotor UAV

2020 American Control Conference (ACC), 2020
This paper develops a control scheme capable of controlling a tilt-rotor unmanned aerial vehicle during nominal hover and fixed-wing flight as well as through transitions between flight modes. The control scheme consists of two parts: a low-level angular rate controller and variable mixer, and a trajectory tracking state-dependent LQR controller.
Jacob Willis, Jacob C. Johnson, Randal W. Beard   +2 more
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Design of failover micro aerial vehicle with tilting rotors

2016 8th International Congress on Ultra Modern Telecommunications and Control Systems and Workshops (ICUMT), 2016
In this paper we address the fault tolerance problem of micro aerial vehicles. This problem is important in cases where people and equipment safety and situation control matters. We propose an special construction of aerial vehicle that adds multiple additional degrees of freedom to vehicle's engines.
Denis A. Khvostov, Sergey A. Chepinskiy, Aleksandr J. Krasnov, Ksenia Khvostova, Grigory Shmigelsky   +4 more
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Experimental Validation of a Fault Tolerant Hexacopter with Tilted Rotors

International Journal of Electrical and Electronic Engineering & Telecommunications., 2018
Fil: Giribet, Juan Ignacio. Universidad de Buenos Aires. Facultad de Ingeniería. Departamento de Electronica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Saavedra 15.
Giribet, Juan Ignacio, Pose, Claudio Daniel, Ghersin, Alejandro Simon, Mas, Ignacio Agustin   +3 more
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Adaptive trim and trajectory following for a tilt-rotor tricopter

2017 American Control Conference (ACC), 2017
We apply adaptive control to an unconventional aircraft, namely, a three-rotor flight vehicle, one of whose rotors can tilt about the longitudinal axis of the fuselage. This combination of actuators has aerodynamic advantages but also poses challenges in terms of trimming the aircraft in order to balance the torque about the roll, pitch, and yaw axes ...
Ahmad Ansari, Anna Prach, Dennis S. Bernstein   +2 more
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Certification Issues for a Tilt-Rotor Aircraft

SAE Technical Paper Series, 1987
<div class="htmlview paragraph">Powered-lift aircraft, such as the V-22 tilt-rotor, are likely to spin-off a civil version. The present FAA airworthiness certification standards are not considered to be adequate for these unique aircraft. The FAA has drafted certification criteria and held a public conference to review the draft and identify ...
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A Study on Longitudinal Attitude Control of Tilt Rotor Aircraft against Gyro Effect by Tilting Rotor Nacelles

2022 International Automatic Control Conference (CACS), 2022
Yasuhiro Osa, Shuma Ioka, Takaya Masada, Kosuke Sakamoto, Shigeru Uchikado   +4 more
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