Results 191 to 200 of about 4,154,170 (239)

Design and optimization of a ducted fan VTOL MAV controlled by Electric Ducted Fans

2019
In October 2013, we presented our ducted fan VTOL MAV prototype, Dulbema (see figure 1), in the Journal of Mechanic Engineering and Automation (JMEA).1 From an aerodynamic study carried out at the Universite Libre de Bruxelles (ULB), in pursuit of the latest Minidrones competition issued by the French Aerospace Lab ONERA, the ULB decided to continue ...
MOAAD, Yacoubi, ALAAEDDINE, Jlassi, JAWAD, Karoun, TARIK, Ben Kirane, LEKMAN, Bekkali, HAMZA, Jhabli, PATRICK, Hendrick   +6 more
openaire   +1 more source

Ducted Fan VTOL for Working Platform

SAE Technical Paper Series, 1991
<div class="htmlview paragraph">Making use of advantages of ducted fan, i.e. compactness and approachability, ducted fan VTOL can be used for many purposes, such as construction and servicing of the tall structures, rescue, etc.. In this paper the development of a working platform which utilizes the ducted fan VTOL concept is tried.
Shohei Niwa, Masayuki Suzuki
openaire   +1 more source

Hover-to-Cruise Transition Control for High-Speed Level Flight of Ducted Fan UAV

International Conference on Unmanned Aircraft Systems, 2020
In this paper, we address the hover-to-cruise transition control problem for high-speed level flight of a ducted fan UAV. Firstly, the nonlinear aircraft dynamic system is derived and relevant key aerodynamic characteristics are presented.
Zihuan Cheng, Hailong Pei
semanticscholar   +1 more source

Ducted Fan Efficiency and Noise

SAE Technical Paper Series, 2005
<div class="htmlview paragraph">NACA reports from the 1950s and more recently developed CFD codes are used to define features necessary for the creation of an efficient ducted fan system. Sources of ducted fan noise are identified and methods to minimize that noise are outlined. The connection between efficiency and noise is detailed.</div>
openaire   +1 more source

Parametric study on the aerodynamic performance of a ducted-fan rotor using free-form method

Aerospace Science and Technology, 2020
In this paper, the effects of various parameters, especially three engineering parameters (twist, sweep, lean), on aerodynamic and structural performance of the fan blade were investigated.
C. Fan, R. A. Adjei, Yadong Wu, Anjenq Wang   +3 more
semanticscholar   +1 more source

Nondimensional Modeling of Ducted-Fan Aerodynamics

Journal of Aircraft, 2012
The unique aerodynamic nature of the ducted-fan configuration makes it difficult to represent in terms of traditional nondimensional coefficients. Analysis of wind-tunnel data for an axisymmetric generic ducted-fan configuration has led to a new nondimensional modeling scheme. Force coefficients are plotted versus advance ratio for a range of angles of
Osgar John Ohanian, Paul A. Gelhausen, Daniel J. Inman   +2 more
openaire   +1 more source

Evaluation of quad ducted‐fan helicopter

International Journal of Intelligent Unmanned Systems, 2013
PurposeWith the purpose of clearing up the risk to rotor blades, this paper develops a quad ducted‐fan helicopter using four ducted‐fans instead of four rotor blades in a quad rotor helicopter.Design/methodology/approachAuto hovering test, auto cruise test, and altitude control simulations were conducted to estimate the flight performance of the quad ...
Masafumi Miwa, Shinji Uemura, Yasuyuki Ishihara, Akitaka Imamura, Joon‐hwan Shim, Kiyoshi Ioi   +5 more
openaire   +1 more source

Matching fan and motor design parameters in electric ducted fans

Proceedings of Global Power & Propulsion Society
Electric propulsion systems are gaining more research interest as a way to achieve zero-emission aviation. However, scaling up such systems for larger civil aircraft flying at higher flight speeds poses challenges. One major issue is aligning the performance of electric motors with the aerodynamic design of the fan. This paper discusses matching of the
Viacheslav A. Sedunin, James V. Taylor, Sam D. Grimshaw   +2 more
openaire   +1 more source

Unsteady aerodynamic analysis of ducted fans

Journal of Propulsion and Power, 1991
A steady and unsteady aerodynamic analysis of ducted fans has been developed using a frequency domain panel method based on three-dimensional linear compressible lifting surface theory. The duct is assumed to be a finite-length right-circular cylinder concentric with the rotor.
Marc H. Williams, Jinsoo Cho, William N. Dalton   +2 more
openaire   +1 more source

Ducted fan UAV hovering attitude control

Proceedings of 2011 International Conference on Electronic & Mechanical Engineering and Information Technology, 2011
This paper focus on the modeling and control of a small ducted fan unmanned aerial vehicle (UAV). The mathematical model of the hovering flight UAV is established from aerodynamic analysis. Then, a control method for the hovering flight was obtained, which is based on the H ∞ control theory.
Xiao-lu Ren, Chang-hong Wang, Guo-xing Yi   +2 more
openaire   +1 more source