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Aviation

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Lack of international uniformity in assessing color vision deficiency in professional pilots.

Aviation, space, and environmental medicine
INTRODUCTION: Color is an important characteristic of the aviation environment. Pilots must rapidly and accurately differentiate and identify colors. The medical standards published by the International Civil Aviation Organization (ICAO) require that...

Pilots with vasovagal syncope: fit to fly?

Aviation, space, and environmental medicine
Two pilots who had experienced vasovagal syncope were grounded by the aeromedical service. Pilot A had experienced three episodes of syncope in medical settings, none during flight. Pilot B had experienced four episodes of syncope in emotional/medica...

Helicopter copilot workload during nap-of-the-earth flight.

Aviation, space, and environmental medicine
Two automatic navigation systems, a Doppler radar system and a projected map system, and a hand-held map were examined for their effects on copilot/navigator workload and performance. The automatic navigation systems reduced the number of navigation ...

Towards Microscale Flight: Fabrication, Stability Analysis, and Initial Flight Experiments for 300 μm × 300 μm × 1.5 μm Sized Untethered MEMS Microfliers.

IEEE transactions on nanobioscience
This paper presents modeling, designs, and initial experimental results demonstrating successful untethered microscale flight of stress-engineered microscale structures propelled by thermal forces. These MEMS Microfliers are 300 μm×300 μm×1.5 μm in s...

Fruit fly scale robots can hover longer with flapping wings than with spinning wings.

Journal of the Royal Society, Interface
Hovering flies generate exceptionally high lift, because their wings generate a stable leading edge vortex. Micro flying robots with a similar wing design can generate similar high lift by either flapping or spinning their wings. While it requires le...

Aerodynamic parameters from distributed heterogeneous CNT hair sensors with a feedforward neural network.

Bioinspiration & biomimetics
Distributed arrays of artificial hair sensors have bio-like sensing capabilities to obtain spatial and temporal surface flow information which is an important aspect of an effective fly-by-feel system. The spatiotemporal surface flow measurement enab...

Flow separation on flapping and rotating profiles with spanwise gradients.

Bioinspiration & biomimetics
The growth of leading-edge vortices (LEV) on analogous flapping and rotating profiles has been investigated experimentally. Three time-varying cases were considered: a two-dimensional reference case with a spanwise-uniform angle-of-attack variation α...

UAS stealth: target pursuit at constant distance using a bio-inspired motion camouflage guidance law.

Bioinspiration & biomimetics
The aim of this study is to derive a guidance law by which an unmanned aerial system(s) (UAS) can pursue a moving target at a constant distance, while concealing its own motion. We derive a closed-form solution for the trajectory of the UAS by imposi...

Optimal pitching axis location of flapping wings for efficient hovering flight.

Bioinspiration & biomimetics
Flapping wings can pitch passively about their pitching axes due to their flexibility, inertia, and aerodynamic loads. A shift in the pitching axis location can dynamically alter the aerodynamic loads, which in turn changes the passive pitching motio...