Predictions of F-111 Tact Aircraft Buffet Response,
GENERAL DYNAMICS FORT WORTH TX FORT WORTH DIV
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This report presents a method for predicting buffet response from pressure-fluctuations on scale models in wind tunnels. The method embodies the following features 1 The buffet forcing function is obtained by real time integration of pressure time histories with the natural modes. 2 Damping is obtained for pivot modes from model buffet response. 3 A hybrid method was developed and applied to extend the pivot-mode damping measurements to multiple modes by the use of theoretical damping data. 4 A technique was developed to form composite modes to obtain better one-to-one correspondence between model and aircraft modes to improve the scaling of damping. 5 Diagonalized equations of motion were derived and applied to simplify the multiple degree-of-freedom buffet response calculation. The results presented have shown correlations of predicting and measured buffet response of the F-111 TACT aircraft at M 0.8 with 26 deg. and 35 deg. wing sweeps for a range of angles-of-attack that includes buffet onset to high intensity buffeting.
- Attack and Fighter Aircraft