Results 21 to 30 of about 7,829,300 (104)
Axial-Flux Permanent-Magnet Dual-Rotor Generator for a Counter-Rotating Wind Turbine
Energies, 2020 Coaxial counter-rotating propellers have been widely applied in ships and helicopters for improving the propulsion efficiency and offsetting system reactive torques.
Filip Kutt +2 more
doaj +1 more source
Unmanned Helicopter Type Aircraft for the Pesticides and Fertilizers Application
Сельскохозяйственные машины и технологии, 2020 Digital agricultural production is based on robotic agricultural technologies for the use of pesticides and fertilizers using unmanned aerial systems, which are based on unmanned aerial vehicles for monitoring agricultural land, the pesticides ...
L. A. Marchenko +4 more
doaj +1 more source
A rational approach to comparing the performance of coaxial and conventional rotors [PDF]
, 2009 The merit, in terms of its efficiency and performance, of the twin, contrarotating coaxial rotor configuration over the more conventional single rotor system has long been a point of contention.
Brown, R.E., Kim, Hyo Wan
core +4 more sources
Научный вестник МГТУ ГАA coaxial main rotor (MR), consisting of upper (UR) and lower (LR) rotors with a spacing of planes and a different direction of rotation, has a number of advantages in aerodynamic characteristics compared to an equivalent single rotor of the same radius,
P. V. Makeev
doaj +1 more source
Applications of Twin Counter-Rotating Common-Axis Rotor Systems in Modern Rotorcraft and UAVs
Engineering ProceedingsThis study represents a comprehensive analysis of the implementation of twin counter-rotating common-axis (coaxial) rotor systems in the design process and technical application of rotorcraft and Unmanned Aerial Vehicles (UAVs).
Gabriel Georgiev, Vladimir Serbezov
doaj +1 more source
Sulfide‐Based Electrolytes for All‐Solid‐State Sodium Batteries
Advanced Energy Materials, EarlyView.This review covers the structural features and synthesis strategies of sulfide‐based solid electrolytes, as well as critical challenges related to conductivity, interfacial and moisture stability, and scaling‐up for practical application in Sodium‐based All Solid‐State Batteries.
Han Yang +6 more
wiley +1 more source
Advanced Physics Research, EarlyView.The schematic diagram shows the flow configuration of the model. The swirling flow of shear‐thinning materials is significantly investigated under the influence of mixed convection. In addition, heat and mass transfer flow characteristics along with gyrotactic microorganisms is also investigated. ABSTRACT Thermal conductivity, temperature gradient, and
Latif Ahmad +3 more
wiley +1 more source
Simultaneous Robust Control and Sensor Fault Detection for a Ducted Coaxial-Rotor UAV
IEEE Access, 2019 This paper addresses the aerodynamic modeling, observer-based state-feedback robust control and sensor fault detection for a laboratory ducted coaxial-rotor UAV (DCUAV).
Chang Xu, Hongguang Jia, Zaibin Chen
doaj +1 more source
SmartBot, EarlyView.Electrostatic clutches offer programmable variable stiffness for multi‐DOF robots, but their continuous motion is usually bottlenecked by spatial constraints and detachment delays. Here, the authors report a compact annular electrostatic clutch joint with a biphasic amplitude‐frequency modulation strategy to rapidly mitigate residual polarization ...
Haochen Yong +5 more
wiley +1 more source
Bursting Oscillation Characteristics and Improved AHODFC for DFIG and PMSG Combined Wind Farm
Energy Internet, EarlyView.ABSTRACT Bursting oscillations occur in DFIG and PMSG combined wind farm under external disturbances and lead to the instability problems. To reveal the bursting oscillation characteristics and develop a suppression method, a fast‐slow dynamics analysis method and an improved adaptive high‐order differential feedback controller (AHODFC) based on ...
Kun Wang +3 more
wiley +1 more source