회전 효과를 고려한 Active Gurney Flap의 동특성 해석

In this study, the finite element analysis was carried out to investigate dynamic characteristics of active Gurney flap which is developed to reduce vibration and noise of the helicopter rotor system. Gurney flap is a kind of small flat plate, mounted normal to the lower surface of the airfoil near to trailing edge. A brushless motor, L-shaped linkages and flap parts were integrated into the NACA-23013 airfoil bade, and 3~5/rev control was given to the active flap for reduction of the Nb/rev vibration in the fixed frame. Thus, an explicit time integration method was adopted to estimate dynamic displacements of Gurney flap with considering the centrifugal force due to blade rotation.