Results 51 to 60 of about 2,332 (184)

Output Error Method for Tiltrotor Unstable in Hover

Archive of Mechanical Engineering, 2017
This article investigates unstable tiltrotor in hover system identification from flight test data. The aircraft dynamics was described by a linear model defined in Body-Fixed-Coordinate System.
Lichota Piotr, Szulczyk Joanna
doaj   +1 more source

Residual based tilt tri‐rotor UAV actuator fault detection using TSK fuzzy model

IET Control Theory &Applications, Volume 19, Issue 1, January/December 2025.
This article proposes a residual‐based fault detection algorithm to address actuator failures in tilt tri‐rotor UAVs. Using the TSK fuzzy model and kernel principal component analysis (KPCA) for enhanced accuracy, the method is validated through simulations and real flight data, achieving high accuracy and real‐time performance with a response time of ...
Guang He, Yi Bao, Liang Xin, Zhiqiang Long   +3 more
wiley   +1 more source

VTOL UAV Transition Maneuver Using Incremental Nonlinear Dynamic Inversion

International Journal of Aerospace Engineering, Volume 2018, Issue 1, 2018., 2018
The paper seeks to study the control system design of a novel unmanned aerial vehicle (UAV). The UAV is capable of vertical takeoff and landing (VTOL), transition flight and cruising via the technique of direct force control. The incremental nonlinear dynamic inversion (INDI) approach is adopted for the 6‐DOF nonlinear and nonaffine control of the UAV.
Zhenchang Liu, Jie Guo, Mengting Li, Shengjing Tang, Xiao Wang, Paul Williams   +5 more
wiley   +1 more source

Wind Disturbance Rejection Control Of Tilt Rotor Aircraft In Transition Phase Based On Improved Active Disturbance Rejection Control

Journal of Applied Science and Engineering, 2023
The tilt rotor aircraft is capable of both low-speed hovering and high-speed flight, which has a larger flight envelope. However, during its transition phase, due to the change of the mechanical structure, the dynamic characteristics of the rotor and the
Liben Yang, Wenjun Wei, Jianfeng Yang, Dong Wang   +3 more
doaj   +1 more source

Towards High-order Methods for Rotorcraft Applications [PDF]

, 2017
This work presents CFD results obtained with an efficient, high-order, finite-volume scheme. The formulation is based on the variable extrapolation MUSCL-scheme, and high-order spatial accuracy is achieved using correction terms obtained through ...
Barakos, George N., Jimenez-Garcia, Antonio   +1 more
core  

Fuel Weight Fraction Estimation for a Disk–Rotor Hybrid Aircraft Along an Optimal Flight Trajectory During Concept Design

International Journal of Aerospace Engineering, Volume 2025, Issue 1, 2025.
Owing to the transition flight of rotor/wing hybrid vertical take‐off and landing (VTOL) aircraft, the fuel weight cannot be estimated from empirical data during the conceptual design phase. This paper proposes a method for estimating the minimal fuel weight fraction (FWF) through a strategy of trajectory optimization under a given flight profile.
Menglin Yang, Zhiqiang Wan, De Yan, Jingwei Chen, Jinchao Chen   +4 more
wiley   +1 more source

Statistical modeling to relate technology readiness to schedule

Systems Engineering, Volume 27, Issue 1, Page 120-139, January 2024.
Abstract Projects from U.S. National Aeronautics and Space Administration and Department of Energy technology development activities provide historical data on project completion timelines versus technology readiness levels that were assessed during the life cycle of a program. A statistical analysis was performed to develop a method to forecast future
C. Robert Kenley, Shrividya Subramanian, Katherine M. Adams   +2 more
wiley   +1 more source

Study on modular design method of tiltable rotor system for quad tilt-rotor unmanned aircraft

Hangkong gongcheng jinzhan, 2023
The tilt-rotor unmanned aerial vehicle has the obvious trend of multi-rotor development, and modular design of tiltable rotor system is helpful to integrate assembly and can reduce design duplication.
SUN Xiaobin, XU Jinfa
doaj   +1 more source

Path‐Tracking Control of Tilting Quadrotor UAV Based on Variable Structure Sliding Mode Control Method

International Journal of Aerospace Engineering, Volume 2024, Issue 1, 2024.
Tilting quadcopter unmanned aerial vehicles have the ability to perform vertical takeoff and landing, hover in the air, and cruise at high speeds, They can complete various flight tasks. Due to the special flight mode of tilting quadcopter unmanned aerial vehicles, in transition mode, as the tilt angle changes, the control process of the drone becomes ...
Qinghua Liu, Ke Zhang, Yunfan Pan, Huan Zhang, Jinchao Chen   +4 more
wiley   +1 more source

Investigation of the Internal Flow Characteristics of a Tiltrotor Aircraft Engine Inlet in a Gust Environment

Aerospace
In the vertical take-off and landing (VTOL) state of tiltrotor aircraft, the inlet entrance encounters the incoming airflow at a 90° attack angle, resulting in highly complex internal flow characteristics that are extremely susceptible to gusts ...
Haicheng Zhu, Xiaoming He, Yue Zhang, Daishu Cheng, Ziyun Wang, Yufeng Huang, Huijun Tan   +6 more
doaj   +1 more source