This experimental study, focusing on the effects of turbulence on long-span bridge aerodynamics, examined the anatomy of turbulence effects on the self-excited forces responsible for flutter and the spanwise correlation of the overall aerodynamic lift and moment. This examination was conducted by measuring pressure distributions around an oscillating prism. A forcedvibration system was used wit...

Abstract Flutter is an important instability in aeroelasticity. In this work,we derive a model for phenomenon which naturally leads to equation similar van der Pol oscillator the friction term given by fractional derivative. Motivated these considerations,we study and show that it exhibits Hopf bifurcation. The based on one-dimensional reduction where instabilities associated with flutter are p...

In current bridge aeroelastic analysis frameworks, predictions of flutter instability and buffeting response to wind fluctuations are treated as two separate procedures. The flutter instability is analyzed through the solution of a complex eigenvalue problem, offering information on how the self-excited forces influence bridge dynamics, especially the modal damping, and eventually drive the bri...

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 ...

The Solar powered unmanned aircraft have a high-aspect-ratio wings because SPUAV must satisfy the requirement of long endurance and high lift-drag ratio. Therefore, the structure of SPUAV‘s wings are structurally very flexible. The very high flexible wing might have large deformation and many aeroelastic problems. In this paper have a static/dynamic aeroelastic analysis through CFD-CSD coupled ...

The problem of the determination of the subcritical aeroelastic response and flutter instability of nonlinear two-dimensional lifting surfaces in an incompressible flow-field via Volterra series approach is addressed. The related aeroelastic governing equations are based upon the inclusion of structural nonlinearities, of the linear unsteady aerodynamics and consideration of an arbitrary time-d...

Current linear aeroelastic analysis approaches are not suited for capturing the emerging concerns in bridge aerodynamics introduced by aerodynamic nonlinearities and turbulence effects. These issues may become critical for bridges with increasing spans and/or with aerodynamic characteristics sensitive to the effective angle of incidence. This paper presents a nonlinear aerodynamic force model a...

Aerial drones have improved significantly over the recent decades with stronger and smaller motors, more powerful propellers, overall optimization of systems. These improvements consequently increased top speeds a variety performance aspects, along introducing new structural challenges, such as whirl flutter. Whirl flutter is an aeroelastic instability that can be affected by or aerodynamic non...