BACKGROUND Human factors involved with visual attention mechanism and fatigue are critical causes of modern aviation accidents. OBJECTIVE To investigate the connection between attention and flight fatigue, a mathematical model of pilot's visual attention allocation was established based on information processing channels. Multi-task condition and current psychophysical state were taken into a...

Quadrotors are rapidly emerging as a popular platform for unmanned aerial vehicle (UAV) research, due to the simplicity of their construction and maintenance, their ability to hover, and their vertical take off and landing (VTOL) capability. Current designs have often considered only nominal operating conditions for vehicle control design. This work seeks to address issues that arise when devia...

In recent years, the aeronautical industry has established numerical flow simulations as a key element in the aerodynamic design process, complementing wind tunnel and flight testing. Consequently, nowadays numerical simulation is already an important cornerstone for aircraft design. The continuous development of physical models and numerical methods and the availability of increasingly powerfu...

The fundamental objective of autopilot design for missile systems is to provide stability with satisfactory performance and robustness over the whole range of flight conditions throughout the entire flight envelope that missiles are required to operate in, during all probable engagements. Depending on the control mode (skid-to-turn or bank-to-turn), intercept scenario (such as surface to surfac...

One of the most important issues in the flight control system of a space plane is how to overcome various uncertainties. This study aims to design a nonlinear adaptive flight control system based on the Immersion and Invariance (I&I) method to tolerate the uncertainties of parameters. In general, it is difficult to acquire several exact parameters, such as stability derivatives, of a space plan...

We have approached the problem of reverse-engineering the flight control mechanism of the fruit fly by studying the dynamics of the responses to a visual stimulus during takeoff. Building upon a prior framework [G. Card and M. Dickinson, J. Exp. Biol., vol. 211, pp. 341-353, 2008], we seek to understand the strategies employed by the animal to stabilize attitude and orientation during these eva...

background and aims: infectious bronchitis virus (ibv) is the etiological agent of infectious bronchitis (ib), which is an acute and highly contagious disease of the respiratory and sometimes the urogenital tracts of chickens. in iran, the disease has been identified in chicken flocks with serological and virus isolation methods. gene 3c (e) encode envelop (small membrane) protein. for envelope...

The aerodynamic design and analysis of an Unmanned Air Vehicle, capable vertical take-off landing by employing fixed four rotors on the tilt-wing two tilt-tail, will be presented in this study. Both main wing horizontal tail can tilted 90°. During VTOL, transition forward flight, thrust forces have been employed. Different flight conditions, including effects angle attack, side slip, tilt contr...

This article proposes a novel algorithm for aerobatic trajectory generation vertical take-off and landing (VTOL) tailsitter flying wing aircraft. The differs from existing approaches fixed-wing generation, as it considers realistic six-degree-of-freedom (6-DOF) flight dynamics model, including aerodynamic equations. Using global model enables the of aerobatics trajectories that exploit entire e...

Abstract The installation of large bypass ratio engines on classical under wing configurations may lead to shock/boundary layer interaction the lower surface, limiting flight envelope in a similar way buffet occurring suction side at high incidences transonic flight. In this study, effects surface induced by Ultra-High-Bypass-Ratio through flow nacelle are assessed means wind tunnel testing. Un...