ABSTRACT
The design model implicitly assumes the existence of an analysis model used to evaluate the functions f,h9g. For example, the analysis models may be finite element analyses of structural behavior, system simulation, or curve-fitted experimental data. Analysis models may be explicit or implicit. In an explicit model, the model function forms are explicitly represented by mathematical, usually algebraic, functions; in an implicit model, the model functions are usually represented by a procedure or subroutine, for example, an iterative numerical solution of a set of differential equations.
