Results 21 to 30 of about 314,370 (260)
Helicopter tail rotor thrust and main rotor wake coupling in crosswind flight [PDF]
, 2010 The tail rotor of a helicopter with a single main rotor configuration can experience a significant reduction in thrust when the aircraft operates in crosswind flight. Brown’s vorticity transport model has been used to simulate a main rotor and tail rotor
Fletcher, Timothy M., Brown, Richard
core +4 more sources
Time and space optimality of rotor-router graph exploration [PDF]
Information Processing Letters, 2017 We consider the problem of exploration of an anonymous, port-labeled, undirected graph with $n$ nodes and $m$ edges and diameter $D$, by a single mobile agent. Initially the agent does not know the graph topology nor any of the global parameters. Moreover, the agent does not know the incoming port when entering to a vertex.
Artur Menc +2 more
openaire +2 more sources
Aerodynamic Performance of V8 Octorotor MAV with Different Rotor Configurations in Hover
Machines, 2023 A new multirotor aerial vehicle with two rotor arms formed in a V-shape configuration is introduced in this paper. To figure out the aerodynamic interference effects between rotors as an implication of the control method, this paper discusses the ...
Yao Lei, Zhicheng Feng, Chensong Ma
doaj +1 more source
Simulation of wind turbine wake interaction using the vorticity transport model [PDF]
, 2010 The aerodynamic interactions that can occur within a wind farm can result in the constituent turbines generating a lower power output than would be possible if each of the turbines were operated in isolation.
Fletcher, Timothy M. +5 more
core +1 more source
Rigid rotor in phase space [PDF]
Physical Review A, 2001 Angular momentum is important concept in physics, and its phase space properties are important in various applications. In this work phase space analysis of the angular momentum is made from its classical definition, and by imposing uncertainty principle its quantum properties are obtained.
openaire +2 more sources
Numerical simulation of unsteady aerodynamic interactions of contra-rotating axial fan. [PDF]
PLoS ONE, 2018 This paper describes the investigations performed to better understand unsteady effect that develop in a contra-rotating axial fan. More specifically, this study focuses on rotor-rotor interactions effects on unsteady characteristic and blade aerodynamic
Hengxuan Luan +2 more
doaj +1 more source
Intelligent Early Fault Diagnosis of Space Flywheel Rotor System
Sensors, 2023 Three frequently encountered problems—a variety of fault types, data with insufficient labels, and missing fault types—are the common challenges in the early fault diagnosis of space flywheel rotor systems. Focusing on the above issues, this paper proposes an intelligent early fault diagnosis method based on the multi-channel convolutional neural ...
Hui Liao +3 more
openaire +3 more sources
Methods for Attenuation of Helicopter [PDF]
فناوری در مهندسی هوافضا, 2023 Helicopters can be a source of loud noise. The high production noise of helicopters makes them unsuitable for densely populated areas, especially in low-flying conditions.
Hamid Parhizkar +2 more
doaj +1 more source
Hover performance and smoke flow field study of key configuration parameters for staggered rotor systems [PDF]
AIP AdvancesThe staggered rotor system is a potential power system layout for compact multi-rotor aircraft designed for urban air mobility. Deeply revealing the aerodynamic interaction mechanism between rotors under the influence of key configuration parameters is ...
He Zhu +5 more
doaj +1 more source
Energies, 2021 This study aimed to determine the optimal rotor spacing of two vertical-axis wind turbines, which are simulated by miniature models arranged side-by-side with a relatively low aspect ratio.
Yoshifumi Jodai, Yutaka Hara
doaj +1 more source