Results 181 to 190 of about 10,614 (216)
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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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Aeromechanical Loads on a Mars Coaxial Rotor
Proceedings of the Vertical Flight Society 74th Annual Forum, 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 ...
Daniel Escobar +2 more
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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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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.
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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A Coaxial Magnetic Gear With Consequent-Pole Rotors
IEEE Transactions on Energy Conversion, 2017In this paper, a novel coaxial magnetic gear (MG) is proposed, in which both permanent magnet and consequent poles are employed on the inner and outer rotors. The MG is expected with improved torque transmission capability by increasing the effective magnetic flux and offering additional reluctance torque.
Jian-Xin Shen +3 more
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Design and dynamic modelling of a coaxial-rotor system
2016 8th International Conference on Modelling, Identification and Control (ICMIC), 2016Coaxial-rotor configuration with the compact structure and vertical take-off ability make itself a good configuration to execute highly difficult task. In this paper, the structural design of coaxial-rotor system is introduced, and we discuss the control principle behind coaxial configuration.
Na Zhao +4 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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Coaxial Rotor Broadband Noise Prediction in Hover
Proceedings of the Vertical Flight Society 76th Annual Forum, 2020This paper presents an efficient prediction of coaxial rotor broadband noise, particularly trailing-edge noise. The method combines a newly developed iterative coaxial rotor BEMT, a viscous panel method, an empirical wall pressure spectrum, and Amiet's trailing-edge noise model.
Seongkyu Lee, Inbal Shlesinger
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Quantification of Swirl Recovery in a Coaxial Rotor System
Proceedings of the Vertical Flight Society 73rd Annual Forum, 2017Experiments were performed in hover on a 2 m diameter, isolated single rotor system, a coaxial counter-rotating rotor (CCR) system, and coaxial co-rotating (stacked) rotor system to quantitatively extract the swirl recovery of a CCR system. The performance comparison was based on induced power factors obtained from curve fits to momentum theory.
Daiju Uehara, Jayant Sirohi
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