Results 71 to 80 of about 7,948 (233)
One‐Dimensional Finite Elements With Arbitrary Cross‐Sectional Displacement Fields
International Journal for Numerical Methods in Engineering, Volume 127, Issue 1, 15 January 2026.ABSTRACT This paper introduces an unprecedented unified approach for developing structural theories with an arbitrary kinematic variable over the beam cross‐section. Each of the three displacement variables can be analyzed using an independent expansion function. Both the order of the expansion and the number of terms in each field can be any. That is,
E. Carrera, D. Scano, E. Zappino
wiley +1 more source
The effect of helicopter configuration on the fluid dynamics of brownout [PDF]
, 2008 Brown’s Vorticity Transport Model, coupled to an additional particle transport model, is used to simulate the development of the dust cloud that can form around a helicopter when operating in dusty or desert conditions.
Brown, R.E. +3 more
core
Mathematical modeling and investigating the effect of the area of the horizontal stabilizer on the stability of a single-main-rotor helicopter in forward flight [PDF]
مجله مدل سازی در مهندسی, 2019 This paper investigates the effect of the area of the horizontal stabilizer of a single-main-rotor helicopter on its dynamic responses, stability properties, and flight handling quality during forward flights.
Fatemeh Ghaderi, Farid Shahmiri
doaj +1 more source
Jixie chuandong, 2018 For unmanned helicopter economic cruises,main rotor speed changes could be significant. At present,the most effective method of changing the main rotor speed associated with the great speed range and low cost is a variable speed gear transmission ...
Li Zhengminqing +4 more
doaj
Flight Control of a Novel Distributed Tiltrotor UAV With Experiments
IET Control Theory &Applications, Volume 20, Issue 1, January/December 2026.Considering the mode transition control of a novel distributed tiltrotor UAV, we designed a fast fixed‐time sliding mode attitude controller to improve the response speed and robustness of the control system. Furthermore, a smooth mode transition strategy is developed to guarantee the stable conversion between fixed‐wing and helicopter modes ...
Li Yu +4 more
wiley +1 more source
Modelling the Draganflyer four-rotor helicopter
IEEE International Conference on Robotics and Automation, 2004. Proceedings. ICRA '04. 2004, 2004 The Draganflyer is a radio-controlled helicopter. It is powered by 4 rotors and is capable of motion in air in 6 degrees of freedom and of stable hovering. For flying it requires a high degree of skill, with the operator continually making small adjustments.
openaire +2 more sources
Sensitivity of tail rotor noise to helicopter configuration in forward flight
, 2009 Understanding the mechanisms that lead to the production of noise by tail rotors across a broad range of flight conditions and helicopter configurations remains an active area of research.
Fletcher, Timothy M. +5 more
core
Geometric Sensitivity and Performance–Flow Field Coupling in Coaxial and Staggered Rotor Systems
International Journal of Aerospace Engineering, Volume 2026, Issue 1, 2026.Multirotor aerodynamic interference exerts a remarkable influence on the aerodynamic characteristics of distributed rotorcraft. It triggers complex flow structures and performance changes, whereas the inherent relationship between flow field characteristics and performance evolution has not yet been clarified.
He Zhu +6 more
wiley +1 more source
An investigation of coupling ship/rotor flowfield using steady and unsteady rotor methods
Engineering Applications of Computational Fluid Mechanics, 2017 A coupling numerical methodology has been developed using the Navier–Stokes solver for ship/rotor flowfield simulation during the helicopter shipboard launch.
Yongjie Shi, Yi Xu, Kun Zong, Guohua Xu
doaj +1 more source
Structural Control and Health Monitoring, Volume 2026, Issue 1, 2026.The growth of wind energy in regions with extreme climates and low temperatures has underscored the need to monitor and quantify ice formations on wind turbine blades. This study aims to tackle this challenge by developing a deep learning model based on convolutional neural networks (CNNs) capable of predicting ice accumulation on blades using ...
Paola Guevara +3 more
wiley +1 more source