The Vibration Response of the Helicopter Coupling with Aircraft Gun

Abstract

The vibration response characteristics of the helicopter due to the launching load of the aircraft gun has been studied. Based on the finite element method, a fully coupled dynamics analysis model by considering the helicopter and aircraft gun was constructed. The effect of the aircraft gun launching load on the vibration response of the helicopter was analyzed with the different firing angles of the gun. The results show that the front-back and up-down vibration of the airframe is greatly affected by the elevating firing angles, and the left-right vibration displacement is greatly affected by the azimuth firing angle. The front-back and up-down vibration of the helicopter decreases with the increase of the azimuth firing angle, and the left-right vibration displacement increases with the azimuth firing angle. When the elevating firing angles are at the two limit firing angles of +10 degree and -60 degree, the vibration direction at the same position of the airframe is opposite. The results are useful for the control of airframe vibration and the dynamic matching between the airframe and the gun.