Results 81 to 90 of about 10,614 (216)
Review for the Design and Experimental Study of a Coaxial Twin-rotor Mars Unmanned Aerial Vehicle
Space: Science & TechnologyThe thin atmosphere of Mars presents a necessary yet challenging flight environment for low-altitude flying vehicles or unmanned aerial vehicles. As a key technology, Martian unmanned aerial vehicles hold marked value and importance for scientific ...
Zhifang Ke +10 more
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Научный вестник МГТУ ГА, 2018 The efficiency of the helicopter main rotor in the hover mode is very important, because this mode essentially determines the performance characteristics of the helicopter.
Y. M. Ignatkin +2 more
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Coupled Design of Non-flow Ripple and Non-axial Force for Lightweight Roots Pump
Jixie chuandong, 2021 In order to realize non-flow ripple and non-axial force of roots pump with helical rotor and greater capacity utilization and smaller internal leakage as desired by its lightweight，for high cross shape coefficient of rotor，a construction method for chord
Weifeng Wu, Jie Tong, Yulong Li
doaj
Recent Efforts Enabling Martian Rotorcraft Missions [PDF]
The Mars Helicopter (MH), launching as a part of the Mars 2020 mission, will begin a new era of planetary exploration. Mars research has historically been conducted through landers, rovers, and satellites.
Johnson, Wayne R. +3 more
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Sudden stoppage of rotor in a thermally driven rotary motor made from double-walled carbon nanotubes [PDF]
, 2016 In a thermally driven rotary motor made from double-walled carbon nanotubes, the rotor (inner tube) can be actuated to rotate within the stator (outer tube) when the environmental temperature is high enough.
Cai, K, Qin, Q H, Yin, H, Yu, J Z
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Comparison of Linear and Nonlinear Controllers Applied to Path Following with Coaxial-Rotor MAV
AutomationThis work presents a nonlinear aerodynamic model that describes the dynamics of a coaxial-rotor MAV. We have designed seven control laws based on linear and nonlinear controllers for path-following with a coaxial-rotor MAV in the presence of unknown ...
Arturo Tadeo Espinoza Fraire +3 more
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Computations of Torque-Balanced Coaxial Rotor Flows [PDF]
Interactional aerodynamics has been studied for counter-rotating coaxial rotors in hover. The effects of torque balancing on the performance of coaxial-rotor systems have been investigated.
Chan, William M. +2 more
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Aerodynamic and Aeroacoustic Effects of Variable Rotor Speed in a Coaxial Rotor System
International Journal of Aeronautical and Space SciencesAbstract Coaxial helicopters offer performance advantages for high-speed flight, but their tightly coupled rotors generate complex aerodynamic interactions and intense noise. This study investigates the potential of Variable Rotor Speed (VRS) to improve the aerodynamic ...
Taeseok Yuk +3 more
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Broadband Noise Simulation of Small Coaxial Rotor Configurations [PDF]
In small multirotor configurations such as eVTOL or drones, the broadband noise can become a dominant noise source. The low tip Mach number and disturbed rotor inflow can have a significant influence on both the noise spectra and the noise directivity, especially in high frequency.
openaire +2 more sources
Pitch-Regulated Control Strategy for Coaxial Drone with Variable Rotor Space Ratio
DronesThis study investigates the impact of rotor spacing on the aerodynamic performance of a coaxialcopter and promotes an innovative regulated control strategy for the coaxial drone. The present research introduces a coaxialcopter with variable rotor spacing,
Zhifang Ke +9 more
doaj +1 more source