Results 11 to 20 of about 3,999 (214)
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.
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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
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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
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Generating a Statistically Constrained Quaternary Model of a Buried Bedrock Valley Using FDEM. [PDF]
Ground WaterAbstract An airborne electromagnetic (AEM) survey was conducted using the Resolve™ frequency‐domain system over a buried bedrock valley near Elora, Ontario, Canada. A statistical bootstrapping approach was used to establish a relationship between the electrical resistivity from spatially interpolated one‐dimensional AEM resistivity models and the ...
Gorrie C +5 more
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Drag Characteristics and Reduction Test for Hub of Coaxial-rotor Helicopter
Hangkong gongcheng jinzhan, 2020 The drag of coaxial helicopter hub accounts is more than 50% of the total helicopter's waste drag, so it is necessary to research the drag characteristics and reduction design of the hub. Wind tunnel test is carried out for a coaxial helicopter hub model,
LONG Haibin, WU Yuping
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Comparative analysis of simulation environments for a virtual testing ground to measure vibration and acoustic emissions of designed flying objects [PDF]
E3S Web of Conferences, 2021 The article deals with an important issue of creating virtual test grounds. The problem of measuring vibrations and acoustic emissions of designed objects of the aircraft industry, etc is studied.
Abramkina Kristina +2 more
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Optimal design of fixed-pitch coaxial-rotor helicopter by using Particle Swarm Optimization
Nihon Kikai Gakkai ronbunshu, 2016 In this study, the optimal mechanical design method for fixed-pitch coaxial-rotor helicopter is proposed. The fixed-pitch coaxial-rotor helicopter has several advantages compared with other type helicopters.
Masahiro TATSUNO +3 more
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A comparison of coaxial and conventional rotor performance [PDF]
, 2009 The performance of a coaxial rotor in hover, in steady forward flight, and in level, coordinated turns is contrasted with that of an equivalent, conventional rotor with the same overall solidity, number of blades, and blade aerodynamic properties.
Brown, Brown, Kim, Landgrebe, Newman
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Aerospace, 2023 This study develops a hybrid solver with reversed overset assembly technology (ROAT), a viscous vortex particle method (VVPM), and a CFD program based on the URNS method, in order to study the aerodynamic and acoustic characteristics of coaxial rigid ...
Yucheng Yang +3 more
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Vibration loads analysis of coaxial rigid rotor in rotor interaction
Xibei Gongye Daxue Xuebao, 2021 A vibration load computing method for a coaxial rigid rotor was developed and applied to analyzing its vibration load in rotor interference. The structural dynamics model based on the medium-size deformation beam theory and the double-rotor aerodynamics ...
Yu Zhihao +3 more
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