Research on the iterative method for model updating based on the frequency response function

Abstract

Model reduction technique is usually employed in model updating process. In this paper, a new model updating method named as cross-model cross-frequency response function (CMCF) method is proposed and a new iterative method associating the model updating method with the model reduction technique is investigated. The new model updating method utilizes the frequency response function to avoid the modal analysis process and it does not need to pair or scale the measured and the analytical frequency response function, which could greatly increase the number of the equations and the updating parameters. Based on the traditional iterative method, a correction term related to the errors resulting from the replacement of the reduction matrix of the experimental model with that of the finite element model is added in the new iterative method. Comparisons between the traditional iterative method and the proposed iterative method are shown by model updating examples of solar panels, and both of these two iterative methods combine the CMCF method and the succession-level approximate reduction technique. Results show the effectiveness of the CMCF method and the proposed iterative method.