Abstract
In order to carry out the structural optimization for large-scale structures such as automotive whole body, the authors have proposed the hierarchical optimization method by applying substructure synthesis approach. It gives the relationship between eigenvalues of the whole structure and those of the component structures, which can substitute the large scale optimization problem to the small scale optimization problem. This paper examines the structural optimization problem of floor panel, where lay out of additional frame is decided so that eigenvalues of floor panel coincide the designated values. The eigenvalues of the floor is given by forementioned hierarchical optimization approach.
