Results 1 to 10 of about 189,174 (279)

Parameter Analysis of Active Flap Control for Rotor Aerodynamic Control and Design

open access: yesInternational Journal of Aerospace Engineering, 2023
Active rotor control of helicopters is the future development direction, and active flap control (AFC) is one of the most promising technologies. However, the numerical simulation of an AFC rotor is challenging.
Runze Xia   +3 more
doaj   +1 more source

A Multiscale Accuracy Degradation Prediction Method of Planetary Roller Screw Mechanism Based on Fractal Theory Considering Thread Surface Roughness

open access: yesFractal and Fractional, 2021
The wear problems are vital to the planetary roller screw mechanism (PRSM) as they have a great influence on transmission accuracy, working efficiency, and service life.
Junjie Meng   +5 more
doaj   +1 more source

Research on Contact and Wear Characteristics of the Planetary Roller Screw Mechanism with Screw Misalignments

open access: yesLubricants, 2022
Misalignments are unavoidable in most applications of the planetary roller screw mechanism (PRSM) due to many potential causes. However, the effect of screw misalignments on the contact characteristics for the PRSM have not been thoroughly investigated ...
Junjie Meng   +5 more
doaj   +1 more source

Research progress of helicopter noise suppression technology based on materials/structures

open access: yesJournal of Aeronautical Materials, 2022
Helicopter has achieved rapid development and wide application in various fields, due to its unique flight mode. However, the noise is also a particular feature of the helicopter, which people cannot bear without protection.
LI Wenzhi, CAO Yaoqin, HE Zhiping
doaj   +1 more source

Examining the stability derivatives of a compound helicopter [PDF]

open access: yes, 2016
Some helicopter manufacturers are exploring the compound helicopter design as it could potentially satisfy the new emerging requirements placed on the next generation of rotorcraft.
Ferguson, Kevin, Thomson, Douglas
core   +1 more source

Maneuverability assessment of a compound helicopter configuration [PDF]

open access: yes, 2016
The compound helicopter design could potentially satisfy the new emerging requirements placed on the next generation of rotorcraft. The main benefit of the compound helicopter is its ability to reach speeds that significantly surpass those of the ...
Ferguson, Kevin, Thomson, Douglas
core   +1 more source

Supervised Control of a Flying Performing Robot using its Intrinsic Sound [PDF]

open access: yes, 2009
We present the current results of our ongoing research in achieving efficient control of a flying robot for a wide variety of possible applications. A lightweight small indoor helicopter has been equipped with an embedded system and relatively simple ...
Gongora, Mario A.   +3 more
core   +1 more source

A Novel Active Vibration Control Method for Helicopter Fuselages Based on Diffusion Cooperation

open access: yesInternational Journal of Aerospace Engineering, 2023
Against the background of low-frequency vibration control for a helicopter fuselage in flight, active control of structural response (ACSR) has been employed for vibration control design.
Jingliang Li, Yang Lu
doaj   +1 more source

Modelling the helicopter rotor aerodynamics at forward flight with free wake model and URANS method

open access: yesAviation, 2020
The presented work is dedicated to the numerical study of the aerodynamic characteristics of the helicopter rotor. Two approaches to modeling of the rotor are applied: the free wake model developed by the Authors with using steady airfoil characteristics
Yuri Ignatkin   +3 more
doaj   +1 more source

Dendrite Refinement and Improved Mechanical Properties of SiC/TiC/Al Hybrid Nanocomposites

open access: yesAdvances in Materials Science and Engineering, 2022
Hybrid nano-(SiCp + TiCp)/Al composites were fabricated by liquid ultrasonic assisted semisolid stirring processing. The eutectic silicon of Al matrix changes from acicular to fine granular with addition of nanoparticles and the dendrite size of primary ...
Hui Xie, Jinze Lv
doaj   +1 more source

Home - About - Disclaimer - Privacy