Results 51 to 60 of about 3,036 (184)
Neural Network Adaptive Attitude Control of Full-States Quad Tiltrotor UAV
AerospaceThe control stability and accuracy of quad tiltrotor UAVs is improved when encountering external disturbances during automatic flight by an active disturbance rejection control (ADRC) parameter self-tuning control strategy based on a radial basis ...
Jiong He +5 more
doaj +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 +2 more
wiley +1 more source
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 +4 more
wiley +1 more source
Tiltrotor Acoustic Data Acquisition and Analysis
Aerotecnica Missili & Spazio, 2021 Pressure load measurements in operative conditions represent a fundamental parameter for improving the knowledge of the in-flight forcing generation and transmission. Furthermore, it is a fundamental step for assessing the validity and confidence of numerical methods able to predict such pressure loads, usually generated by propulsion and turbulent ...
Marano A. D. +6 more
openaire +3 more sources
Numerical simulations on the ERICA tiltrotor [PDF]
Aerospace Science and Technology, 2017 This paper presents aerodynamic calculations of the model-scale ERICA tiltrotor with high-fidelity\ud computational fluid dynamics. The aim of this work is to assess the capability of the present CFD\ud method in predicting airloads on the tiltrotor at different flight configurations. In this regard, three\ud representative flight configurations of the
Jimenez Garcia, Antonio +1 more
openaire +1 more source
Whirl and Stall Flutter Simulation Using CFD [PDF]
, 2017 This paper presents recent research on numerical methods for whirl and stall flutter using computational fluid dynamics. The method involves coupling of the HMB3 CFD solver of the University of Glasgow and a NASTRAN derived structural model. Based upon
Barakos, George N., Higgins, Ross J.
core
Adaptive Surrogate-Based Optimization of Vortex Generators for a Tiltrotor Geometry [PDF]
, 2017 Design of vortex generators (VGs) on a tiltrotor aircraft infinite wing is presented using an adaptive surrogate modelling approach. Particular design issues in tiltrotors produce wings that are thick and highly loaded, so separation and early onset ...
Allen, Christian +3 more
core +2 more sources
A numerical study on active control for tiltrotor whirl flutter stability augmentation [PDF]
, 2004 The use of active control to augment whirl flutter stability of tiltrotor aircraft is studied by means of a multibody simulation. The numerical model is based on a 1/5 scale semi-span aeroelastic wind tunnel model of a generic tiltrotor concept and ...
Ferrer, Rogelio +4 more
core
A Novel Aerodynamic Modeling Method Based on Data for Tiltrotor evtol
Applied SciencesA data-driven aerodynamic modeling method is proposed to address the problem that traditional modeling methods based on physical mechanisms cannot fully represent the special aerodynamic characteristics of tiltrotor evtol aircraft.
Haiyang Wang, Peng Li, Dongsu Wu
doaj +1 more source
Modelling and Simulation in High-Fidelity Crash Analysis of NGCTR-TD Composite Wing
AerospaceThis paper presents a methodology that involves the development of high-fidelity modeling and simulation procedures aimed at supporting virtual certification for crashworthiness requirements specific to tiltrotor aircraft, addressing the critical need ...
Luigi Di Palma +3 more
doaj +1 more source