Dynamics Analysis And Active Vibration Control Based On The Vertical Tail Of Twin-finned Airplane

Buffeting is a kind of random vibration response, it arises when the unsteady flowingdisturbing the wing. With the improvement of aircraft performance, buffeting phenomenon has becomefrequently. The buffeting may result in the aircraft fatigue fracture and crack, lower the wing stability,and even endanger the safety of flight, result in the crash. In order to increase the fatigue lifeof vertical structure, studying issues related to tail buffeting and buffet alleviation is necessary.In this paper, first, recent researches on the active suppression of vertical tail vibration withpiezoelectric smart structure are introduced. Based on the previous research, a simplified method foranalyzing and designing a vertical tail buffeting alleviation system is developed. The vertical tail modelin this study is equipped with surface-bonded piezoelectric actuators to suppress the buffeting responsesinduced by aerodynamic forces. Creating a coupling dynamics equation of piezoelectric materials andstructures, and using Ansys and Matlab to the dynamic numerical simulation calculation. The structuraldynamics of the vertical tail and the electrodynamics of piezoelectric actuators are modeled using afinite element method and realized by commercial software packages Ansys. Afterward, the finiteelement model for both the host structure and the piezoelectric patches are imported into Matlab, inwhich the dynamic equations of the system in modal coordinates are obtained through modal truncation.The motion-induced aerodynamic forces are computed by using the doublet-lattice method. The buffetinput excitations are simulated by the proper orthogonal decomposition-based method. The suboptimalcontroller and robust controller are designed to compute suitable control voltages needed to drivepiezoelectric actuators. Finally, the effectiveness of the piezoelectric actuators in reducing vibratoryresponses due to buffet loads on the vertical tail is investigated numerically. The results demonstrate thatthe proposed method is feasible and effective.