Model Validation Strategy and Estimation of Response Uncertainty for a Bolted Structure with Model-Form Errors

The model-form uncertainty and the connection parameter uncertainty are difficult to separate in structural dynamics. In this paper, we study a model-form uncertainty substructure identification method. Through the precision evaluation of the hyper-model of the substructure, and the experimental modal analysis of the substructure, the method of identifying the model-form uncertainty in the overall structure is given. Through the experimental modal analysis of the connection substructure, the uncertainty quantification is conducted and the joints parameters of the structure are identified. Finally, the response error estimation of the overall structure is given by combining the uncertainty of model form and of parameters. By comparing with the response errors estimated of the overall experiment, the proposed method is validated. In this paper, using modal parameters and frequency response as the response feature. A general definition of validation metrics was conducted which related to frequency response function. By using a bolted frame the framework of model validation is illustrated and the validation of the method in this paper is proved.