CORRECTION OF FINITE-ELEMENT MODELS USING EXPERIMENTAL MODAL DATA

This paper presents a method to be used for correction of finite-eleme nt models by referring their modal parameters to experimental modal da ta. The proposed method is based upon both the sensitivity analysis an d the least square method, and gives us the physically realistic solut ion of design variables, in contrast with the methods based on pseudo- inverse. Numerical simulations of finite-element models of a beam and a plate are presented to demonstrate the effectiveness and the validit y of the proposed method in comparison with the pseudo-inverse method with respect to physical meaning of structures. Further, the correctio n of a finite-element model of an actual structure is carried out by r eferring its modal parameters to experimentally extracted modal data.