This article proposes a new approach for centralized path planning of multiple aircraft in presence of the obstacle-laden environment under low flying rules. The problem considers as a unified nonlinear constraint optimization problem. The minimum time and control investigate as the cost functions and the maximum velocity and power consider as the constraints. The pseudospectral method applies ...

The demand for new propeller designs has increased alongside the development of technology, such as urban aircraft and large unmanned aerial vehicles. In order to experimentally identify performance a propeller, wind tunnel that provides operating flow is essential. However, in case meter class or larger required related equipment becomes heavy; therefore, it difficult implement reality. For th...

Abstract Tiltrotor aircraft are growing in prevalence due to the usefulness of their unique flight envelope. However, aeroelastic stability—particularly whirl flutter stability—is a major design influence that demands accurate prediction. Several nonlinearities may be present tiltrotor systems, such as freeplay, often neglected for simplicity, either modelling or stability analysis. effects can...

The syn-atropisomers of the title bis(tertiary amide)s were designed as six-bladed molecular propellers based on the "directing effects" of amide dipoles; the helicity of the propeller is biased to prefer one handedness upon the attachment of point chirality to the amide nitrogens to attain stronger circular-dichroism activity than for the non-propeller-shaped anti-isomers.