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. +3 more
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A rational approach to comparing the performance of coaxial and conventional rotors [PDF]
, 2009 The merit, in terms of its efficiency and performance, of the twin, contrarotating coaxial rotor configuration over the more conventional single rotor system has long been a point of contention.
Brown, R.E., Kim, Hyo Wan
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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
doaj +1 more source
Investigation on Aerodynamic Noise Characteristics of Coaxial Rotor in Hover
Applied Sciences, 2022 A numerical method based on Reynolds Averaged Navier–Stokes (RANS) equations and a high-efficiency trim model is developed to simulate the aerodynamics of a coaxial rotor.
Haotian Qi +3 more
doaj +1 more source
High-Torque-Density Low-Cost Magnetic Gear Utilizing Hybrid Magnets and Advanced Materials [PDF]
, 2019 Two major challenges of existing high-performance magnetic gears are: (i) High content of rare-earth permanent magnets which results in high cost as well as price fluctuation; (ii) Conflict between mechanical and electromagnetic performances, especially ...
Al-Qarni, Ali Hussain +2 more
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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
doaj +1 more source
A Coupled CFD/Trim Analysis of Coaxial Rotors
TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, 2022 A numerical simulation method of computational fluid dynamics (CFD) coupling with a trim analysis for coaxial rotor systems is described in this paper. The trim analysis is implemented using a rotorcraft flow solver, rFlow3D. Six target forces and moments, which are the thrust of the coaxial rotor system, the rolling and pitching moments for each upper
Sugawara, Hideaki +2 more
openaire +2 more sources
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.
Dacheng Su +3 more
doaj +1 more source
Helicopter tail rotor thrust and main rotor wake coupling in crosswind flight [PDF]
, 2010 The tail rotor of a helicopter with a single main rotor configuration can experience a significant reduction in thrust when the aircraft operates in crosswind flight. Brown’s vorticity transport model has been used to simulate a main rotor and tail rotor
Balch D. T. +9 more
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Mars Science Helicopter Conceptual Design [PDF]
, 2020 Robotic planetary aerial vehicles increase the range of terrain that can be examined, compared to traditional landers and rovers, and have more near-surface capability than orbiters. Aerial mobility is a promising possibility for planetary exploration as
Balaram, Jayarao +15 more
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