Development of Structural Modification Method in Consideration of Non-linear Elements

Abstract

The modal synthesis method for mass, stiffness or damping structural modification is so extended as to take into consideration of non-linear elements. First the experimental modal analysis is used to characterize the non-linear elements, like rubber mounts, engine mounts, etc. with respect to the frequency of external force but also to the acceleration level. Then a new method of structural modification developed can predict when the original structure is modified by non-linear elements. In addition to numerical examples, the method is applied to an actual simple structure.