21st Congress of International Council of the Aeronautical Sciences, Melbourne, Australia, 13-18 September, 1998
Paper ICAS-98-4.5.2

BRAZILIAN F-S EXTERNAL STORES AEROELASTIC INTEGRATION

Annes da Silva R. G., Brandao M. P., Alonso A. C. P., Bones C. A., de Feria Mello O. A., Lucht R. R.
CTA/IAE/ ASA, Brazil

Keywords: brazilian f-s, external stores, aeroelastic integration

The present work summarizes the development of a project for flutter clearance of external stores installed in the Brazilian Air Force (FAB) Northrop F-5E aircraft. The work is described in the same sequence of the project development. Initially, ground tests have been performed to determine the dynamic characteristics of the airframe. Then, a finite-element model has been constructed and updated to reproduce the tests results. After this phase, aeroelastic models have been developed, by introducing appropriate aerodynamic theories, depending on the flight regime to be analyzed. The final step in the project is the in-flight flutter clearance, where the aeroelastic models shall be validated based on measurements of the airframe total damping. The paper describes the theoretical and experimental methodologies involved in this integration and provides details of thee difficulties and solutions found during the work.

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