It is well-known that insects utilize vortices generated by flapping, by which they generate larger lift than that evaluated by the ordinary aerodynamic theory. However, the relative position between the vortices and the wing is affected by the motion of the center of gravity(CG). Such effect has not been well understood. To clarify the effect, we numerically analyzed a simple model considering...

This study explored the muscle strain and activation patterns of several key flight muscles of the pigeon (Columba livia) during takeoff and landing flight. Using electromyography (EMG) to measure muscle activation, and sonomicrometry to quantify muscle strain, we evaluated the muscle function patterns of the pectoralis, biceps, humerotriceps and scapulotriceps as pigeons flew between two perch...

This paper presents a model of an agile tail-sitter aircraft, which can operate as a helicopter as well as capable of transition to fixed-wing flight. Aerodynamics of the co-axial counter-rotating propellers with quad rotors are analysed under the condition that the co-axial is operated at equal rotor torque (power). A finite-time convergent observer based on Lyapunov function is presented to e...

This paper describes the transition of academically developed multiagent technology for UAV coordination to an industrially developed application. The specific application is the use of lightweight UAVs with small Received Signal Strength Indicator sensors to cooperatively locate targets emitting radio frequency signals in a large area. It is shown that general techniques can be effectively tra...

licorice, the oldest chinese traditional medicine, is widely used in the treatment of human diseases. due to the deficiency of wild resource, selecting and breeding becomes a key issue to expanding the supply of licorice. spaceflight technology will become a new method for medicinal plants. the aim of this study was to investigate the effect of spaceflight on the components and anti-inflammator...

In this paper we describe two situation recognition systems that have been developed for a flight simulator environment. The first system uses heuristic rules based on a state-transition diagram to determine the current stage of a flight. The second system does the same by calculating the probabilities of both the start and end of possible situations and determining the most probable situation....