Fin buffeting alleviation in disturbed flow by buffeting principal modal control method

Fin buffeting causes severe fatigue problem for modern fighter. In this paper, buffeting principal modal control (BPMC) method was described and demonstrated for fin buffeting alleviation. Simulation work for the first bending and torsion mode response alleviation of a fin model using two arching PZT actuator (APA) was implemented. A piezoelectric fin buffeting control system was designed using BPMC method. A fin model, a delta wing and a blunt body were designed and made as test model and flow disturbers, experiment of the fin model buffeting active control in the disturbed flow of the delta wing and blunt body was implemented in a wind tunnel with adoption of APA. Test results indicate that the peak value of the power spectrum density function of the fin model tip buffeting displacement response causing by either of the two flow disturbers can be suppressed by more than 50%.