Dynamic Identification Method of Complex Structures

摘要

A global identification method for complex structures, which improves the finite element computation model for the study of harmonic vibrations, based on measured natural modes is outlined. Modes are introduced as displacements imposed on a part of the structure in a static problem involving rigidity and mass operators. The method seeks the unknown parameters which minimize the euclidian norm of the reaction forces corresponding to the prescribed measured displacements. When numerous measured points are spread on the structure, it is possible to localize the modeling errors. Numerical results for a plate and an axisymmetric composite structure are given.