The most popular configurations of VToL UAVs employed in the above defined scenarios are the quadrotor and the hexarotor, which are platforms equipped with four and six propellers, respectively, aligned in the same direction. Hence, these aerial vehicles are underactuated mechanical systems having six...
A few startups have pursued a different approach — VTOL aircraft with a hybrid-electric propulsion system. A Hybrid-Electric VTOL aircraft uses a smaller fuel-burning engine as a power generator, thereby supplying electricity to motors that turn the propellers or fans, depending on the design. ...
Due to the component degradation, damages, etc, unexpected faults may occur to propellers assembled in VTOL UAVs [1]. Without the fault-tolerant mechanism, the tracking performance and the system stability could be degraded. As for the attitude-only control problem of multirotor UAVs, adaptive sli...
Free Essays from Bartleby | Innovative Aircraft History of the V-22, including Challenges: The V22-Osprey was an aircraft that began as a figment of the...
As for the transition trajectory optimization of the tilt-rotor VTOL UAV discussed in this paper, the most important variables are the time of the whole transition process, the tilting angle acceleration, and the thrust generated by the front and rear propellers. Thus, studying the influence of ...
However, the large propellers limit the top speed to about 300 knots. Another problem with tiltrotors involves stability control difficulties. Turbulent rotational flow on the propeller blades may occur in descent and cause a vortex-ring state, which causes unsteady shifting of the flow along the ...
However, the large propellers limit the top speed to about 300 knots. Another problem with tiltrotors involves stability control difficulties. Turbulent rotational flow on the propeller blades may occur in descent and cause a vortex-ring state, which causes unsteady shifting of the flow along the ...
Common VTOL power units include electric propellers and turbojets [7]. The authors of [8] summarized the detailed design of specific drone elements and propulsion components. There are many platforms powered by electric propellers, such as ducted [9], dual-rotor, tri-rotor, quad-rotor, and ve...