The Structural Optimization System OPTSYS

Abstract

OPTSYS is a modular structural optimization system with well defined interfaces to FE-programs and codes for aeroelasticity. A mathematical programming approach is adopted were a sequence of convex approximations of the initial problem is solved, using the MMA method. This approach makes it possible to take all design criteria into account simultaneously. Gradients are calculated semi-analytically. OPTSYS can treat design variables associated to the shape of the structure, the element cross section properties or the material direction in the case of composite materials. Design criteria can be defined on weight, moment of inertia, displacement, stress, eigenfrequency, local buckling, flutter and aileron efficiency. Recent developments has concerned dynamic response and acoustics. Other important ingredients are; the integration of a preprocessor to define shape variables, the treatment of discrete variables and the possibility to deal with substructured FE models. The capabilities and methods will be discussed and illustrated with applications on aircraft and automotive structures.