Externally powered magnetic nanomotors are of particular interest due to their potential use for in vivo biomedical applications. Here we develop a theory for dynamics and polarization of recently fabricated superparamagnetic chiral nanomotors powered by a rotating magnetic field. We study in detail various experimentally observed regimes of the nanomotor dynamic orientation and propulsion and ...

guidance and control of aircraft in the landing phase imposes extra pilot work loads, hence application of automatic landing control systems is of great importance. in this study automatic landing control systems are introduced and an optimal landing control system is designed. the control system performance criteria are based on minimum control effort. the designed system is simulated for a tr...

It is well known that cavitation phenomena affect the efficiency of propellers. a major world wide economic problem for transport industry. The speed fast, ocean going vessels liimted by effects on hydrofoils and propulsion systems. main approaches industry to mitigate detrimental propellers restricted varying operating conditions, geometric design choice wear resistant materials. We here devel...

We explore the limits of liquid pumping by "classical propellers" with molecular-scale blades. Our molecular dynamics simulations reveal a huge sensitivity of pumping to the chemistry of the blade-liquid interface. We demonstrate selective pumping of hydrophobic and hydrophilic liquids, where the pumping rate is determined by the effective profile of the solvated nanoscopic blades. These result...

A lot of UAV applications require vertical take-off and landing (VTOL) combined with very long-range or endurance. Transitioning UAVs have been proposed to combine the VTOL capabilities helicopters efficient flight properties fixed-wing aircraft. But energy is still a bottleneck for many electric long endurance applications. While solar power technology battery improved lot, in rougher conditio...

Abstract Navigation problems for a model bio-inspired micro-swimmer, consisting of cargo head and propelled by multiple rotating flagella or propellers swimming at low Reynolds numbers, are formulated solved. We consider both the direct problem, namely, predicting velocity trajectories swimmer as consequence prescribed rotation rates propellers, inverse problems, find to best approximate desire...

A series of wind tunnel experiments was conducted to study the e ect of propeller solidity and thrust axis inclination on the propeller normalforce coe cient. Experiments were conducted in the Langley 14by 22-Foot Subsonic Tunnel with a sting-mounted, counterrotation, scalemodel propeller and nacelle. Con gurations had two rows of blades with combinations of 4 and 8 blades per hub. The solidity...