The feasibility of using a stand alone Fluidic Thrust-Vectoring (FTV) system for the purpose of longitudinal trim of an unmanned aerial vehicle is the focus of the research presented in this paper. Since the fluidic thrust vectoring requires high pressure secondary air to deflect the engine exhaust gases, this research also provides an analytical toolset for preliminary sizing of a suitable sec...

This study presents a control design of roll motion for vertical take-off and landing unmanned air vehicle (VTOL-UAV) based on the Model Reference Adaptive Control (MRAC) scheme in hovering flight phase. The adaptive laws are developed UAV system under nonparametric uncertainty (gust wind disturbance). Lyapunov-based stability analysis controlled has been conducted have accordingly developed. U...

This paper describes progress made on the T-Wing tail-sitter UAV programme currently being undertaken via a collaborative research agreement between Sonacom Pty Ltd and the University of Sydney. This vehicle is being developed in response to a perceived requirement for a more flexible surveillance and remote sensing platform than is currently available. Missions for such a platform include coas...

This paper presents a model of an agile tail-sitter aircraft, which can operate as a helicopter as well as capable of transition to fixed-wing flight. Aerodynamics of the co-axial counter-rotating propellers with quad rotors are analysed under the condition that the co-axial is operated at equal rotor torque (power). A finite-time convergent observer based on Lyapunov function is presented to e...

In this paper we address the development of a single-rotor tail-sitter Unmanned Aerial Vehicle (UAV), whose configuration provides structural benefits for flight stabilization. The mathematical model of the vertical take-off landing (VTOL) aircraft is obtained through the Newton-Euler approach. In order to stabilize the vehicle we employ a control algorithm based on separated saturation functio...

Vertical take-off and landing (VTOL) is a type of unmanned aerial vehicle (UAV) that growing rapidly because its ability to take off land anywhere in tight spaces. One VTOL UAV, the tail-sitter, has best efficiency. However, besides efficiency offered, some challenges must still be overcome, including complexity combining hover like helicopter fly horizontally fixed-wing aircraft. This research...

A tail-sitter aircraft’s control is a challenging task, especially during transition maneuvers where the lift and drag forces are highly non-linear. In this work, we implement neural network (NN) capable to estimate such nonlinearities. Once they estimated, one can propose scheme these correctly feed-forwarded. Our NN implementation has been programmed in C++ within PX4 Autopilot, an open-sourc...

The main advantage of tail-sitter unmanned aerial vehicle (UAV) are introduced. Three design solutions of rotor tailsitter lift system of UAV have been presented and the respective control strategies and characteristics of three solutions are also analyzed in the paper, through the related experiments the design of twin-rotor lift system is verified, and its feasibility is proved. The character...