Results 21 to 30 of about 288 (134)

Numerical Calculations on the Unsteady Aerodynamic Force of the Tilt-Rotor Aircraft in Conversion Mode

International Journal of Aerospace Engineering, 2019
A computational method is developed in order to predict the unsteady aerodynamic characteristics of the tilt-rotor aircraft in conversion mode. In this approach, the rotor is modeled as an actuator disk so that the effect of individual blades can be ...
Hao Chen
doaj   +1 more source

Overall design and control analysis of a novel dual-axis tilt-rotor aircraft

Hangkong gongcheng jinzhan
The tilt-rotor aircraft combines the capabilities of vertical takeoff and landing with efficient high-speed cruising, making it suitable for short-haul low-altitude transportation.
DENG Li, LU Dongping, ZHANG Wei, WANG Nan, LEI Zonglin, YAN Junze, YANG Jianting   +6 more
doaj   +1 more source

Research on Pilot Control Strategy and Workload for Tilt-Rotor Aircraft Conversion Procedure

Aerospace, 2023
This paper studies the pilot control strategy and workload of a tilt-rotor aircraft dynamic conversion procedure between helicopter mode and fixed-wing mode.
Xufei Yan, Ye Yuan, Renliang Chen
doaj   +1 more source

Collision‐Resilient Winged Drones Enabled by Tensegrity Structures

Advanced Robotics Research, EarlyView.
Based on structures of birds such as the woodpeck, this article presents the collision‐resilient aerial robot, SWIFT. SWIFT leverages tensegrity structures in the fuselage and wings which allow it to undergo large deformations in a crash, without sustaining damage. Experiments show that SWIFT can reduce impact forces by 70% over conventional structures.
Omar Aloui, Raphael Zufferey, William Stewart, Mohammad Askari, Simon Jeger, Dario Floreano   +5 more
wiley   +1 more source

Robust Reinforcement Learning Control Framework for a Quadrotor Unmanned Aerial Vehicle Using Critic Neural Network

Advanced Intelligent Systems, Volume 7, Issue 3, March 2025.
Quadrotor unmanned aerial vehicle control is critical to maintain flight safety and efficiency, especially when facing external disturbances and model uncertainties. This article presents a robust reinforcement learning control scheme to deal with these challenges.
Yu Cai, Yefeng Yang, Tao Huang, Boyang Li   +3 more
wiley   +1 more source

A Multibody Model of Tilt-Rotor Aircraft Based on Kane’s Method

International Journal of Aerospace Engineering, 2019
A tilt-rotor aircraft can switch between two flight configurations (the helicopter configuration and the fixed-wing plane configuration) by tilting its rotors.
Jianmin Su, Chengyue Su, Sheng Xu, Xiaoxing Yang   +3 more
doaj   +1 more source

Aerodynamic Optimization Design of the Rotor Blade of a Tilt-rotor Aircraft

Hangkong gongcheng jinzhan, 2019
The aerodynamic design of tilt-rotor needs to synthetically consider the different requirements in helicopter mode and fixed-wing aircraft mode. The multi-objective genetic algorithm based on Kriging surrogate model is used to establish an optimization ...
Sun Kaijun, Zhang Lian, Fu Yiwei, Yu Yueyang   +3 more
doaj   +1 more source

Dynamic Modeling and Control for Tilt-Rotor UAV Based on 3D Flow Field Transient CFD

Drones, 2022
The tilt-rotor unmanned aerial vehicle (TRUAV) is characterized by both multi-rotor vertical takeoff or landing and fixed-wing long-duration flight. Not only the structure of TRUAV is complex, but also the aerodynamic coupling is severe.
Hongpeng Wang, Wenhao Sun, Changli Zhao, Sujie Zhang, Jianda Han   +4 more
doaj   +1 more source

A New Paradigm for Understanding the Rheology and Processability of Poly(p‐Phenylene Terephthalamide) Liquid‐Crystalline Solutions

Journal of Applied Polymer Science, EarlyView.
Kevlar is traditionally modeled as a rigid‐rod polymer, yet rheological behavior deviates from this assumption. The review introduces a novel “twist‐tie” entanglement theory for aramid polymer chains in the nematic liquid crystal state, providing a molecular explanation for deviations from rigid‐rod models. Understanding twist‐tie entanglement dynamics
Emma Egli, Jacob L. Pretko, Christopher W. Seay, Steven R. Lustig   +3 more
wiley   +1 more source

Numerical calculation and analysis of aero-acoustic characteristics of tilt rotor in different tilt angles

Xibei Gongye Daxue Xuebao
The numerical calculation model for the aero-acoustic analysis of a tilt rotor was established by combining the free wake method and the FW-H (Ffowcs Williams-Hawkings) equation.
YUAN Mingchuan, SUN Huixun, LI Zhibin, NIU Qingfeng, FAN Feng   +4 more
doaj   +1 more source