Accession Number:

ADP006228

Title:

Predictions of F-111 Tact Aircraft Buffet Response,

Descriptive Note:

Corporate Author:

GENERAL DYNAMICS FORT WORTH TX FORT WORTH DIV

Report Date:

1990-09-01

Pagination or Media Count:

16.0

Abstract:

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.

Subject Categories:

  • Aerodynamics
  • Attack and Fighter Aircraft

Distribution Statement:

APPROVED FOR PUBLIC RELEASE