Identification of linearised joint structural parameters by combined use of measured and computed frequency responses

Abstract

The necessity of accurate prediction of structural dynamics has led to extensive studies on identification of joint structural parameters. The present paper proposes an effective identification scheme for linearised joint parameters of a structure, which makes use of not only the measured frequency response functions (FRFs) of the structure but also the computed FRFs of an auxiliary model. The auxiliary model is constructed such that it possesses the same properties as the test structure except the joint structural parameters to be determined. The fundamental assumption is that the dynamic properties of the structure other than the joint parameters to be identified are completely known. The proposed identification scheme is straighforward and cost-effective, requiring neither modal parameters nor any condensation techniques for the model.