The study presents two novel approaches for gust response analysis of elastic free aircraft configuration using computational fluid dynamics (CFD) tools. The direct approach involves full aeroelastic dynamic simulation within a CFD run. The hybrid approach involves computing rigid sharp-edge gust responses in a CFD run, evaluating the gust input forces due to arbitrary gust profiles via convolu...

Two 2-D aeroelastic models are presented here to determine instability boundary (flutter speed) and gust response of a typical section airfoil with degrees of freedom in pitch and plunge directions. To build these 2-D aeroelastic models, two different aerodynamic theories including Indicial Aerodynamic Theory and Vortex Lattice Method (VLM) have been employed. Also, a 3-D aeroelastic framework ...

This paper presents investigation effects of a sharp edged gust on aeroelastic behavior and time-domain response of a typical section model using Jones approximate aerodynamics for pure plunging motion. Flutter analysis has been done by using p and p-k methods developed for presented finite-state aerodynamic model for a typical section model (airfoil). Introduction of gust analysis as a linear ...

With the aid of a new research facility, transient pressures have been measured on the upper surface of a narrow-delta wing when it entered a sharp-edged gust normal to the wing plane. This paper describes the facility and presents an analysis of the results of six runs through the gust by one model. It is shown that the pressure distribution on any particular cross-section of the wing remains ...

The increased flexibility of long endurance aircraft having high aspect ratio wings necessitates attention to gust response and perhaps the incorporation of gust load alleviation. The design of civil transport aircraft with a strut or truss-braced high aspect ratio wing furthermore requires gust response analysis in the transonic cruise range. This requirement motivates the use of high fidelity...

In this work, the optical absorption near the fundamental absorption edge of co-evaporated Ce0 -V20 films is studied. It is found that the fundamental optical absorption in these materials is sharp more like that expected for crystals. It is also found that as the V O content increases, the edge becomes less sharp and shifts towards higher wavelengths

Enhanced approximate expressions for the incipient indicial lift of thin wings in subsonic potential flow are presented this study, featuring explicit analytical corrections unsteady downwash. Lifting-line and acoustic-wave theories form basis method, within an effective synthesis governing physics, which grants a consistent generalised framework unifies previous works. The perturbation consist...

Aspects of the development process of a flight simulation environment within a Simulink Project are presented. In particular, special attention is given to the control surfaces for longitudinal motion for three different trailing-edge control surface configurations, which differ in number and spanwise size of the individual surfaces. The entire modeling and simulation process consists of four m...

This paper presents the development of a biomimetic closed-loop flight controller that integrates gust alleviation and flight control into a single distributed system. Modern flight controllers predominantly rely on and respond to perturbations in the global states, resulting in rotation or displacement of the entire aircraft prior to the response. This bio-inspired gust alleviation system (GAS...