Results 71 to 80 of about 183,357 (179)

CALCULATED RESEARCH OF INFLUENCE OF HELICOPTER MAIN ROTORS GEOMETRY ON THE EFFICIENCY IN HOVER MODE BASED ON THE NONLINEAR VORTEX MODEL

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, P. V. Makeev, A. I. Shomov   +2 more
doaj   +1 more source

A Vectoring Thrust Coaxial Rotor for Micro Air Vehicle: Modeling, Design and Analysis [PDF]

, 2013
The growing interest of rotary wing UAVs, for military and civilian applications, has encouraged designers to consider miniaturized configurations, more efficient in terms of endurance, payload capability and maneuverability. The purpose of this paper is
Moschetta, Jean-Marc, Prothin, Sebastien
core  

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  

Aerodynamic and Aeroacoustic Effects of Variable Rotor Speed in a Coaxial Rotor System

International Journal of Aeronautical and Space Sciences
Abstract 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, Kukhwan Yu, Homin Kim, Soogab Lee   +3 more
openaire   +1 more source

Comparison of Linear and Nonlinear Controllers Applied to Path Following with Coaxial-Rotor MAV

Automation
This 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, José Armando Sáenz Esqueda, Isaac Gandarilla Esparza, Jorge Alberto Orrante Sakanassi   +3 more
doaj   +1 more source

RATIONALE ARE COAXIAL ROTOR WITH ACTIVE BORER

Литьë и металлургия, 2012
The construction of the executive body passing harvester provides separate rotary drive jumper and internal drill, thus increasing line speeds for milling rock teeth.
openaire   +1 more source

Comparative Study of Coaxial Main Rotor Aerodynamics at Forward Flight Based on Free Wake Model and Unsteady Reynolds- Averaged Navier–Stokes Method

Journal of Aerospace Technology and Management, 2022
This paper is dedicated to the numerical modeling of the aerodynamic characteristics of the full-scale coaxial main rotor. The modes of forward flight in the range of values V = 30−60 m∙s–1 (108−216 km∙h–1) have been under consideration.
Sergey Gennadievich Konstantinov, Yuri Mikhailovich Ignatkin, Pavel Viacheslavovich Makeev, Alexander Ivanovich Shomov, Sergey Olegovich Nikitin   +4 more
doaj  

Pitch-Regulated Control Strategy for Coaxial Drone with Variable Rotor Space Ratio

Drones
This 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, Molei Zhao, Yu Hu, Yongjie Shu, Weibo Liu, Qingkai Meng, Jinghan Tu, Haitao Zhang, Zhaopu Yao, Wei Wei   +9 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

The Optimal Design and an Analysis of a Hybrid W-Shaped IPM Rotor of Coaxial Magnetic Gear

IEEE Access
This paper presents a hybrid, W-shaped interior permanent magnet (HWIPM) rotor of a coaxial magnetic gear (MG). To reduce the usage of rare-earth PM material, it proposes a topology of inner rotor in a MG with two types of PM materials.
Mohammad Amin Masoudi, Seyed Ahmadreza Afsari   +1 more
doaj   +1 more source