Identification of dynamic properties of assembled structures by optimization of the modal assurance criterion (MAC) and modal base

摘要

Assembled structures with localized joints are very common in aircraft structures and proper identification of the mechanical properties of joints is an important issue. Usually the problem is worked out by finding out values that mach the dynamic responses of dynamic ground tests with those provided by finite element model of aircraft structures. In this paper an approach based on optimization methods is used to identify the stiffness of localized joints by two approaches, the first one consists on optimizing the MAC between experimental and numerical data and the second one tries to solve the problem by eliminating the differences between the experimental and numerical modal bases.