Author(s)

F. Seigneuret & S. Grihon

Abstract

An efficient implementation of flutter optimisation using a reduced model F. Seigneuret* & S. GrihorV *BTE/CC/MO, EADS-Airbus S.A., Toulouse, France Abstract Structural optimisation refers to the process of generating optimal thicknesses for a structure by solving mathematical programming problems. Such a problem solved in EADS-Airbus deals with flutter optimisation. The objective function is the structural mass to be minimised. Constraints are lower bounds imposed on aeroelastic dampings, to avoid any coupling in the flight envelope. The traditional approach in structural optimisation is to build a sequence of approximate models, each of them being optimised. Moreover, in flutter optimisation, these approximate models come from reduced dynamic models since modal superposition is used. This method is well suited for convergence but appears to be very time- consuming. The problem comes from modal reanalysis which requires as much FEM updating and as many recomputations

Keywords