Interactional aerodynamics and acoustics of a hingeless coaxial helicopter with an auxiliary propeller in forward flight [PDF]
, 2008 The aerodynamics and acoustics of a generic coaxial helicopter with a stiff main rotor system and a tail- mounted propulsor are investigated using Brown's Vorticity Transport Model.
Brown, R.E. +7 more
core +14 more sources
Identification and modeling of the three rotational movements of a miniature coaxial helicopter [PDF]
Simulation, 2013 This paper presents the identification of a miniature coaxial helicopter system. First, the helicopter flying principles are described and the hardware setup of the developed platform is presented. Further, linear models are developed for the movements of the helicopter using prediction error identification methods.
Clara Mihaela Ionescu +2 more
exaly +4 more sources
The effect of floating spline parameter on the dynamic characteristic of encased differential planetary gear train [PDF]
Scientific ReportsThe load sharing performance of encased differential planetary system has a great impact on the operating performance and service life of the transmission system of the coaxial high speed helicopter.
Xiaoyu Che +3 more
doaj +2 more sources
Aeroacoustics of a coaxial rotor in level flight [PDF]
, 2008 The aeroacoustic characteristics of a coaxial system with teetering rotors in level forward °ight are com- pared to those of an equivalent articulated single rotor with the same solidity.
Brown, R.E. +5 more
core +12 more sources
Loads Transfer Principles of Coaxial Helicopter Rotors [PDF]
Journal of the American Helicopter Society, 2023 The load transfer principles of coaxial rotors are analyzed from a theoretical point of view. The theoretical expressions of hub forces and moments are derived by summing the Fourier series of the root forces and moments from all the blades of a coaxial rotor system with the assumption that the rotor loads are identical between the two rotors.
Han, Dong, Barakos, George N.
openaire +1 more source
A hybrid trim strategy for coaxial compound helicopter
Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 2022 Interest in the coaxial compound helicopter (CCH) has been increasing in the civil aviation and engineering community for its high-speed and high-maneuverability features, and is likely to continue to do so for the foreseeable future. Since the control in CCH is totally different from the conventional helicopter, the redundant control strategy design ...
Yuan Su, Zeyuan Wang, Yihua Cao
openaire +3 more sources
Modelling the aerodynamics of coaxial helicopters : from an isolated rotor to a complete aircraft [PDF]
, 2008 This paper provides an overview of recent research on the aerodynamics of coaxial rotors at the Rotorcraft Aeromechanics Laboratory of the Glasgow University Rotorcraft Laboratories.
Brown, R.E. +7 more
core +4 more sources
Design and Control of an Indoor Coaxial Helicopter [PDF]
2006 IEEE/RSJ International Conference on Intelligent Robots and Systems, 2006 This paper presents the design and preliminary control of an indoor coaxial helicopter "CoaX" based on a concept of hybrid active and passive control. The robot is capable of passive roll and pitch stabilization against small disturbances while actively stabilizing the yaw and the altitude.
Samir Bouabdallah +2 more
openaire +2 more sources
Effect of rotor stiffness and lift offset on the aeroacoustics of a coaxial rotor in level flight [PDF]
, 2009 The acoustic characteristics of a twin contra-rotating coaxial rotor configuration with significant flapwise stiffness are investigated in steady forward flight.
Brown, R.E. +5 more
core +6 more sources
Interactional aerodynamics and acoustics of a propeller-augmented compound coaxial helicopter [PDF]
, 2008 The aerodynamic and acoustic characteristics of a generic hingeless coaxial helicopter with a tail-mounted propulsor and stabiliser have been simulated using Brown's Vorticity Transport Model.
Kim, Hyo Wan +3 more
core +4 more sources