Results 1 to 10 of about 92,623 (181)
Aerodynamic Modeling and Performance Analysis of Variable-Speed Coaxial Helicopter
Applied Sciences (Switzerland), 2022 In this paper, the variable-speed coaxial helicopter is modelled by the blade element method, non-uniform inflow method and empirical function method, and the aerodynamic performance analysis method is proposed.
Fang Wang, Anan Xu
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An Analytical Method for Coaxial Helicopter Ground Resonance [PDF]
MATEC Web of Conferences, 2020 A time-frequency analytical method is presented to analyze physical mechanism of coaxial helicopter ground resonance. Eigenvalue calculation and numerical integration of disturbance equations of motions are used to obtain modal characters and time-domain
Liu Xiangyi +4 more
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Applied Sciences (Switzerland), 2023 In this paper, a computational fluid dynamics simulation method is developed to study the influence of the rotor overlapping azimuth on the aerodynamic performance of compound coaxial helicopter.
Chenglong Zhou, Fang Wang, Liang Li
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Design analysis and construction of energy harvesting coaxial helicopter
Aviation, 2013 With the growing need for technology, the tendency for errors has increased many times, which often results in loss of human lives. Our main aim of this paper is to show the implementation of a coaxial rotor aerial vehicle that can be controlled by a ...
Anvinder Singh, Varun Sharma
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Uncertainty Analysis of a Multi-Sensor Fusion Measurement Chain for Blade Collision Warning in Coaxial Twin-Rotor Helicopters [PDF]
SensorsA coaxial twin-rotor helicopter features a compact structure by eliminating the tail rotor. Although offering advantages in lift capability and maneuverability, the design presents challenges from its mechanical complexity and the aerodynamic ...
Wenjie Zheng +5 more
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Engineering Applications of Computational Fluid Mechanics, 2019 Coupled ship/coaxial-rotor simulations have been conducted to investigate the rotor loads of a shipborne coaxial-rotor helicopter during a vertical landing based on Reynolds-averaged Navier-Stokes (RANS) solver.
Yongjie Shi
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Aerodynamic Analysis and Optimization of a Coaxial Helicopter Fuselage [PDF]
Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 2021 The flight dynamics and flight envelope of coaxial ultralight helicopter CoAX 2D were investigated. For this purpose, series of flight tests was carried out. This paper presents the computation of the fuselage aerodynamics of the CoAX 2D with the DLR flow solver TAU.
exaly +4 more sources
Modelling and robust control of an unmanned coaxial rotor helicopter with unstructured uncertainties
Advances in Mechanical Engineering, 2017 A complete methodology for an unmanned coaxial rotor helicopter with unstructured uncertainties was proposed to achieve high-accuracy tracking performance from modelling to robust control.
Chao Liu, Jin-Lin Liu
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Hovering of coaxial Trirotor helicopter constructed with coaxial mechanism driven by a motor
Nihon Kikai Gakkai ronbunshu, 2014 This paper proposes a coaxial trirotor helicopter constructed with coaxial mechanism driven by one motor. There two types of trirotor unmanned aerial vehicles (UAVs) are existed.
Yoshihiro TAKITA +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
europepmc +2 more sources