Results 31 to 40 of about 3,036 (184)
Sliding Mode‐Based Control of a UAV Quadrotor for Suppressing the Cable‐Suspended Payload Vibration
Journal of Control Science and Engineering, Volume 2020, Issue 1, 2020., 2020 This paper addresses the problem of damping vibrations of a cable‐suspended payload during positioning of the quadrotor. A nonlinear model is derived for the coupled quadrotor‐pendulum system in the X-Z plane using Euler–Lagrange formulation. Sliding mode control (SMC) is used for horizontal positioning and payload vibration damping, while a feedback ...
Tom Kusznir +2 more
wiley +1 more source
Aerospace, 2023 Neural networks have been widely used as compensational models for aircraft control designs and as surrogate models for other optimizations. In the case of tiltrotor aircraft, the total number of aircraft states and controls is much greater than that of ...
Jiayu Wen +4 more
doaj +1 more source
Advances in Civil Engineering, Volume 2020, Issue 1, 2020., 2020 Bridge defects are important indicator for the bridge safety assessment. Considering the cost and inefficiency of the traditional method, the UAV system applied for bridge crack inspection is a better choice. Therefore, we have configured a bridge inspection UAV system with SLR camera, laser rangefinder.
Xiong Peng +5 more
wiley +1 more source
Research on Innovative Trim Method for Tiltrotor Aircraft Take‐Off Based on Genetic Algorithm
Journal of Sensors, Volume 2020, Issue 1, 2020., 2020 Tiltrotor aircraft possesses redundant actuators in take‐off phase and its flight control is more complicated than ordinary aircraft because the structural and dynamic characteristics keep changing due to tilting rotors. One of the fundamental bases for flight control is trim, which provides steady flight states under various conditions and then ...
Xueyun Wang +5 more
wiley +1 more source
Energies, 2021 A mid-fidelity aerodynamic solver based on the vortex particle method for wake modeling, DUST, is coupled through the partitioned multi-physics coupling library preCICE to a multibody dynamics code, MBDyn, to improve the accuracy of aeroelastic numerical
Alberto Savino +5 more
doaj +1 more source
Development in aerodynamic design of tiltrotor aircraft
Hangkong gongcheng jinzhanThe tiltrotor aircraft has both traditional helicopter vertical takeoff and landing, airborne hovering capabilities, and high-speed cruising performance of fixed wing aircraft. The excellent flight performance of tiltrotor aircraft has enormous potential
WANG Zonghui, YANG Yunjun, ZHAO Jiaxiang
doaj +1 more source
Numerical Simulation of Rotor–Wing Transient Interaction for a Tiltrotor in the Transition Mode
Mathematics, 2019 Tiltrotor aerodynamic interaction, especially in the transition mode, is a necessary consideration for tiltrotor aerodynamics, and structural design and optimization. Previous studies have paid much attention to the helicopter mode.
Zhenlong Wu, Can Li, Yihua Cao
doaj +1 more source
AerospaceNumerical simulations were conducted to analyze the unsteady aerodynamic characteristics of a tiltrotor aircraft with different conversion strategies.
Guoqing Zhao +4 more
doaj +1 more source
A Preliminary Study on the Development of a New UAV Concept and the Associated Flight Method
Drones, 2023 This article presents a preliminary study on the development of a new concept for an unmanned aerial vehicle (UAV) design that incorporates the use of four wings and attached systems to improve overall performance, it being classified as a hybrid ...
Tiberius-Florian Frigioescu +3 more
doaj +1 more source
Mathematical Modeling and Modal Switching Control of a Novel Tiltrotor UAV
Journal of Robotics, 2018 This paper concentrates on the flight control of a novel tiltrotor aircraft with fixed wings. This kind of aircraft has two flight modes and a transition mode.
Zhiwei Kong, Qiang Lu
doaj +1 more source