A NEW METHOD FOR STRUCTURAL MODEL UPDATING AND JOINT STIFFNESS IDENTIFICATION

✍ Scribed by W.L. LI

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 145 KB
• Volume: 16
• Category: Article
• ISSN: 0888-3270
• DOI: 10.1006/mssp.2000.1339

✦ Synopsis

A new model updating method is presented here with emphasis on identi"cation of joint sti!nesses. A so-called reduced-order characteristic polynomial (ROCP) is "rst de"ned in terms of the measured natural frequency, the partial modal properties predicted from a #awed FEM model and the model parameters to be updated or identi"ed. Based on the premise that each of the measured natural frequencies is a root of the ROCP, a set of non-linear equations becomes immediately available from which the interested model parameters can be determined. The experimental data required are simply the measured natural frequencies, rather than the usually incomplete and less-accurate displacement or FRF data. In addition, there is no modal matching needed here, which can lead to a considerable saving of the resources and e!orts spent on measurements and correlation analyses. The proposed technique is veri"ed by using simulation data. The current scheme is easily generalised into an advanced optimisation formulation, which would allow various constraints to be explicitly imposed upon the model parameters and a wide spectrum of algorithms to be directly used for "nding a solution.