Results 91 to 100 of about 4,258 (219)
Design and fabrication of coaxial micro helicopter [PDF]
, 2012 In this thesis the design of a coaxial micro helicopter is presented and based on the design, a model is fabricated. The thesis starts with the introduction on the previous models of micro helicopters like the Coax and the Epson.
Mishra, Pratik
core
Conditions for escape of a rotor in a rotary nanobearing from short triple-wall nanotubes
Scientific Reports, 2017 In a short nanobearing system made from carbon nanotubes, the rotor with high rotational frequency may escape from the stator, which may cause a stability problem to the system of a nanodevice with such a nanobearing.
Jiao Shi +3 more
doaj +1 more source
Aerodynamics Optimization of a Ducted Coaxial Rotor in Forward Flight Using Orthogonal Test Design
Shock and Vibration, 2018 To investigate the aerodynamic complexities involved in the combination of freestream and propeller’s suction flow field of ducted coaxial rotors system in forward flight, an orthogonal L16(43) test design has been applied to optimize the design ...
Yuening Jiang, Hai Li, Hongguang Jia
doaj +1 more source
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
core +1 more source
Numerical Analysis of Dynamic Properties of Nonlinear Rotor Systems of Aircraft Jet Engines
International Journal of Rotating Machinery, 2000 The paper deals with a manner of modelling and results of the calculation of dynamic properties and vibrations of the double spool aircraft turbofan engine AI-25, used in aeroplanes L-39 (Albatross).
Ján Kamenický +2 more
doaj +1 more source
Energies, 2019 The improvement of wind turbine performance poses a constant challenge to researchers and designers in the field. As a result, the literature presents new concepts of wind turbines (WTs), such as: counter-rotating wind turbines (CRWTs) with two coaxial ...
Mircea Neagoe +2 more
doaj +1 more source
Mars Rotorcraft: Possibilities, Limitations, and Implications For Human/Robotic Exploration [PDF]
, 2004 Several research investigations have examined the challenges and opportunities in the use of small robotic rotorcraft for the exploration of Mars. To date, only vehicles smaller than 150 kg have been studied.
Aiken, Edwin +3 more
core +1 more source
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
openaire +1 more source
ComputationCoaxial magnetic gears have piqued the interest of researchers due to their numerous benefits over mechanical gears. These include reduced noise and vibration, enhanced efficiency, lower maintenance costs, and improved backdrivability.
Panteleimon Tzouganakis +5 more
doaj +1 more source
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