Results 141 to 150 of about 183,357 (179)
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Experimental investigation on the aeroacoustics of coaxial rotors
INTER-NOISE and NOISE-CON Congress and Conference Proceedings, 2023Coaxial rotor configurations are adopted by drones and electric vertical take-off and landing vehicles due to the need of generating high propulsive power within a compact size. The aerodynamic interaction between two closely spaced rotors may induce different noise features than isolated ones.
Zhida Ma +8 more
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Aeromechanics and Aeroelastic Stability of Coaxial Rotors
Journal of Aircraft, 2021Coaxial rotor aeroelasticity is complex due to the counter-rotating wake system, rotor lift offset, periodic blade passage loads, unsteady rotor wake interactions, reduced rotor speed, and stiff hi...
Puneet Singh, Peretz P. Friedmann
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Rotor Design and Aerodynamic Simulation of a Coaxial Rotor Aircraft
2019 IEEE International Conference on Unmanned Systems (ICUS), 2019Based on the concept of a small coaxial rotor aircraft, a new type of blade made from cylinder is designed in this paper. The folding blades can wrap the aircraft properly and form an integral cylinder, which is easy to store and carry. With these blades, the aircraft will be easy to be stored in the cylindrical chamber.
Yiran Wei +4 more
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Design and Control of a Novel Coaxial Tilt-Rotor UAV
IEEE Transactions on Industrial Electronics, 2022In this paper, the design and control of a new coaxial tilt-rotor (CTR) unmanned aerial vehicle (UAV) are presented. The CTRUAV is an electric-powered UAV with a special configuration, which is composed of two pairs of tiltable coaxial rotors and a rear rotor.
Zong-Yang Lv +3 more
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Aeromechanical Loads on a Mars Coaxial Rotor
Proceedings of the Vertical Flight Society 74th Annual Forum and Technology Display, 2018A detailed aeromechanical understanding of a coaxial rotor flying on Mars is presented using a combination of vacuum chamber tests and free-wake based comprehensive analysis. The objectives are to understand the limits of performance, structural loads, control loads (pitch link), wake interaction, and blade strike for hingeless and articulated coaxial ...
Daniel Escobar +2 more
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Aerodynamic Modelling and Experimental Identification of a Coaxial-Rotor UAV
Journal of Intelligent & Robotic Systems, 2012zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Arnaud Koehl +3 more
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Stability and Control of a Coaxial Quadcopter with Rotor-On-Rotor Interactional Aerodynamics
Journal of the American Helicopter SocietyThis article focuses on the integration of generalized rotor-on-rotor interactional aerodynamics models in state-variable form within flight dynamics simulations of multi-rotor unmanned aircraft systems, and on their subsequent linearization. The aircraft chosen for this investigation is a resupply coaxial quadcopter. Upon trimming the flight dynamics
Dogyu Jun, Umberto Saetti, Ondrej Juhasz
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Induced Flow in Coaxial Rotor Systems
2020In coaxial rotor helicopter systems, both rotors of the helicopter spin in opposite directions on the same vertical axis, requiring the bottom rotor to spin faster with a higher blade pitch angle and the top rotor to spin slower with a lower blade pitch angle. This was proven by Peters and Seidel [1].
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Hover Performance of Corotating and Counterrotating Coaxial Rotors
Journal of the American Helicopter Society, 2020Hover testing was performed on a 2-m-diameter coaxial corotating (stacked) rotor system to investigate the effect of azimuthal spacing, or index angle, on performance. Individual rotor thrust and power measurements were performed as a function of the index angles.
Daiju Uehara +2 more
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Performance of Coaxial Propulsion in Design of Multi-rotor UAVs
2016There are many different types of propulsion systems developed for multi rotor UAVs. One of the most interesting designs is so called X8 quadrocopter, which extends original quadrotor concept to 8 motors, arranged in 4 coaxial pairs. The advantage of this solution is increased lift of platform, with reasonable volume of platform kept.
Adam Bondyra +3 more
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