|
|
|
|
|
Yuan Wei, Renliang Chen, Ye Yuan and Luofeng Wang
This study assesses the influence of engine dynamic characteristics on helicopter handling quality during hover and low-speed forward flight. First, we construct the helicopter?engine coupling model (HECM) based on the power-matching relationship between...
ver más
|
|
|
|
|
|
|
|
|
|
|
Yao Lei, Jie Wang and Yazhou Li
This paper investigates the aerodynamic performance of an overlapping octocopter with the effect of horizontal wind ranging from 0 to 4 m/s using both low-speed wind tunnel tests and numerical simulations. The hovering efficiency and the potential contro...
ver más
|
|
|
|
|
|
|
|
|
|
|
Hangwen Zhang, Bochen Li, Boyang Li and Cheng Yang
A numerical method is used to evaluate the influence of propeller parameters on the aerodynamic performance of shrouded coaxial dual rotors in hover. Compared with the open-rotor configuration, the shrouded rotors reduce the tip vortex, resulting in a hi...
ver más
|
|
|
|
|
|
|
|
|
|
|
Chankyu Son and Taewoo Kim
A novel actuator disk model (ADM) coupled with lifting-line theory is proposed in this paper. Several virtual planform blades are placed on a disk plane with a constant azimuthal interval, and the lifting-line theory is applied to each blade to predict t...
ver más
|
|
|
|
|
|
|
|
|
|
|
Yu-Been Lee and Jae-Sang Park
Hover performance analyses of coaxial co-rotating rotors (or stacked rotors), which can be used as lifting rotors for electric VTOL (eVTOL) aircraft, are conducted here. In this study, the rotorcraft comprehensive analysis code, CAMRAD II, is used with t...
ver más
|
|
|
|
|
|
|
|
|
|
|
Pavel Makeev, Yuri Ignatkin and Alexander Shomov
Numerical studies of the aerodynamic characteristics of the coaxial main rotor of the Kamov Ka-32 helicopter in steep descent modes, including the area of the vortex ring state (VRS) modes, have been performed. Used in this paper is an original free vort...
ver más
|
|
|
|
|
|
|
|
|
|
|
Chang Wang, Minqi Huang, Xianmin Peng, Guichuan Zhang, Min Tang and Haowen Wang
The aerodynamic performance of a reduced-scale coaxial rigid rotor system in hover and steady forward flights was experimentally investigated to gain insights into the effect of interference between upper and lower rotors and the influences of the advanc...
ver más
|
|
|
|
|
|
|
|
|
|
|
Yao Lei, Jiading Wang and Wenjie Yang
Micro aerial vehicles (MAVs) usually suffer from several challenges, not least of which are unsatisfactory hover efficiency and limited fly time. This paper discusses the aerodynamic characteristics of a novel Hex-rotor MAV with a coaxial rotor capable o...
ver más
|
|
|
|
|
|
|
|
|
|
|
Yu. M. Gorbatiuk,V. M. Kosiak,S. I. Olefirenko
Pág. 90 - 94
Basic principles and methods of planning of floating bridges are considered. Above all attention is spared to the hydrological aspects of planning of floating bridges, as the area of knowledge that is not explore so much. Importance of account is proved ...
ver más
|
|
|
|
|
|
|
|
|
|
|
Julia A. Cole, Lauren Rajauski, Andrew Loughran, Alexander Karpowicz and Stefanie Salinger
There is currently interest in the design of small electric vertical take-off and landing aircraft to alleviate ground traffic and congestion in major urban areas. To support progress in this area, a conceptual design method for single-main-rotor and lif...
ver más
|
|
|
|
|
|
|
|
|
|
|
Wenbo Shi, Heng Zhang and Yuanxiang Li
The accurate prediction of blade tip vortices continues to be challenging for the investigation of rotor aerodynamics. In the current work, the blade tip vortex system of a Caradonna?Tung rotor in the hovering state is simulated on account of the framewo...
ver más
|
|
|
|
|
|
|
|
|
|
|
Shengjie Xiao, Yuhong Sun, Dapeng Ren, Kai Hu, Huichao Deng, Yun Wang and Xilun Ding
A key challenge in flapping-wing micro air vehicle (FWMAV) design is to generate high aerodynamic force/torque for improving the vehicle?s maneuverability. This paper presents a bio-inspired hover-capable flapping-wing micro air vehicle, named RoboFly.S,...
ver más
|
|
|
|
|
|
|
|
|
|
|
Phillip Burgers
The capability of flapping wings to generate lift is currently evaluated by using the lift coefficient ??????????
C
¯
L
, a dimensionless number that is derived from the basal equation that calculates the steady-state lift coefficient CL for fixed wings....
ver más
|
|
|
|
|
|
|
|
|
|
|
Lindokuhle J. Mpanza and Jimoh Olarewaju Pedro
This paper presents the parameter optimisation of the flight control system of a singlerotor medium-scale rotorcraft. The six degrees-of-freedom (DOF) nonlinear mathematical model of the rotorcraft is developed. This model is then used to develop proport...
ver más
|
|
|
|
|
|
|
|
|
|
|
Alessandro Bacchini and Enrico Cestino
In the last ten years, different concepts of electric vertical take-off and landing aircrafts (eVTOLs) have been tested. This article addresses the problem of the choice of the best configuration. VTOLs built since the fifties are presented and their adv...
ver más
|
|
|
|
|
|
|
|
|
|
|
Jiayi Xie, Zhifeng Xie, Ming Zhou and Jun Qiu
The aerodynamic design of rotor blades is challenging, and is crucial for the development of helicopter technology. Previous aerodynamic optimizations that focused only on limited design points find it difficult to balance flight performance across the e...
ver más
|
|
|
|
|
|
|
|
|
|
|
Xinglu Xia, Dongli Ma, Liang Zhang, Xing?an Liu and Keran Cong
With the rapid development of vertical takeoff and landing (VTOL) aircraft, the blade design of a propeller suitable for VTOL aircraft with a wide range of operating conditions has become a challenging and popular task. This paper proposes a multi-object...
ver más
|
|
|
|
|
|
|
|
|
|
|
Yadong Gao and Yang Xu
Variable diameter rotor can improve the flight performance of the aircraft both in hovering and forward flying and a duct can improve the rotor performance further both in force and efficiency. In previous studies, those two parts are always studied in t...
ver más
|
|
|
|
|
|
|
|
|
|
|
Jiahao Guo and Zhou Zhou
The distributed propulsion system applied to the vertical take-off and landing aircraft must maintain the high performance in both hover and cruise flight. The gap of the power unit has an adverse effect on the distributed ducted fan system, especially i...
ver más
|
|
|
|
|
|
|
|
|
|
|
Guang He, Li Yu, Huaping Huang and Xiangke Wang
The tilt tri-rotor unmanned aerial vehicle (UAV) has three flight modes: the hover mode, the transition mode, and the fixed-wing mode. Controller design in the hover mode is the premise of realizing stable flight of this kind of UAV. Due to the particula...
ver más
|
|
|
|
|
|