We investigate the dynamics of rigid bodies (hollow ‘pyramids’) placed within a background airflow, oscillating with zero mean. The asymmetry of the body introduces a net upward force. We find that when the amplitude of the airflow is above a threshold, the net lift exceeds the weight and the object starts to hover. Our results show that the objects hover at far smaller air amplitudes than woul...

Unmanned aerial vehicle (UAV)-enabled wireless power transfer (WPT) has recently emerged as a promising technique to provide sustainable energy supply for widely distributed low-power ground devices (GDs) in large-scale networks. Compared with the transmitters (ETs) conventional WPT systems which are deployed at fixed locations, UAV-mounted ETs can fly flexibly three-dimensional (3D) space char...

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...

Computational aerodynamic analyses of rotorcraft main rotor blades are performed in both hover and forward flight. The open-source SU2 code is used for performance prediction. core the set RANS equations, which solved determining flow. In hover, steady-state time-accurate modelling techniques varying complexity assessed. Simulation specific parameters have a significant influence on solution al...

Abstract Background: Photocatalytic process is used as a suitable method for o-chlorophenol removal. In this study, the efficiency of a mixture of modified fly ash and TiO2 nanoparticles in photocatalytic removal of o-chlorophenol was evaluated. Methods: After acid washing of fly ash, the absorbent was oxidized with potassium permanganate. ...

The aim of this paper is to present a mini tilt-rotor unmanned aerial vehicle which is capable to perform hover flight. Unlike conventional full-scale tiltrotors, in our design we avoid the use of swashplate and we propose a simpler mechanical design which use only the tilting rotors to stabilize the vehicle dynamics. A detailed mathematical model is derived via the Newton-Euler formalism. A no...

A computational approach to generate real-time, optimal trajectories for a flight control experiment is presented. Minimum time trajectories are computed for hover-to-hover and forward flight maneuvers. Instantaneous changes in the trajectory constraints that model obstacles and threats are also investigated. Experimental results using the Nonlinear Trajectory Generation software package show g...

This paper details the developments to date of an unmanned air vehicle (UAV) based on a standard size 60 model helicopter. The design goal is to have the helicopter achieve stable hover with the aid of an INS and monocular vision. The focus of this paper is on the development of an artificial neural network that makes use of this data to generate hover command, which are used to directly manipu...

There is a growing need for vertical takeoff and landing vehicles, including drones, which are safe to use can adapt collisions. The risks of damage by collision, humans, obstacles in the environment, drones themselves, significant. This has prompted search into nature highly resilient structure that inform design propellers reduce those enhance safety. Inspired flexibility resilience dragonfly...

plants firing fuel oil produce huge quantities of fly ash as solid waste, which needs to becharacterized prior to its proper management. it is worth mentioning that the published literature lackcomprehensive information on the characteristics of such fly ash. characteristics of fuel oil fly ash producedat selected power (pp) and water desalination (dp) plants were determined. the results showed...