Identification of Material Properties of Composite Plates Utilizing Model Updating and Response Surface Techniques

摘要

The identification of the material properties for the Carbon-Epoxy composite plates is presented. Modal testing is carried out on the manufactured plates to measure the natural frequencies and the mode shapes. The modal analyses are carried out for the sampled values of the orthotropic material properties. Samples are generated by utilizing the Central Composite Design technique. The natural frequencies and the mode shapes are predicted from the finite element analysis. Both quadratic response surfaces and artificial neural network (ANN) models are established for the residual between the predicted and the measured natural frequencies and the Modal Assurance Criteria (MAC). The accuracy of the response surface models is discussed. Sensitivities of the natural frequencies and the MAC for the significant modes are estimated. Sequential Quadratic Programming technique is utilized as the optimization method. The efficiencies of quadratic response surfaces and the ANNs are assessed.