The effects of structural nonlinearities, in particular friction and backlash, on the dynamic behaviour of airplanes can be very important for flutter. Larger nonlinearities do exist on sweepable wing airplanes with sweepable wing mounted stores because a considerable amount of joints (with possible play) and bearings (with play and friction) is necessary but the problem is also present for fired wing airplanes. A major problem is the interpretation of linear ground resonance and flight flutter tests and their comparison with analytical predictions. Findings from ground resonance tests and flight flutter tests are presented and an explanation for these test results is given. Calculations with linear assumptions (parameter variations) were made and the method of harmonic balance for finding these parameters was applied. It is shown certain levels of excitation must be reached in order to make flight flutter tests reliable for establishing flutter clearance speeds.
Effects of Nonlinearities on Wing Store Flutter
1980
16 pages
Report
Keine Angabe
Englisch
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