Model updating of an aeroengine casing based on the mixed boundary substructure

A complex structure finite element model updating method based on the mixed boundary component mode synthesis (CMS) was proposed. The major steps of the proposed finite element model updating method include: (1) substructure partition, partition of the updating area into substructure and residual structure according to the junction ways. (2) Reduction and assembly, reduce the internal degree of freedoms (DOFs) to the mixed boundary DOFs by mixed boundary CMS, and assemble the reduction matrix of substructure into the residual structure physical matrix. （3) Updating, assemble residual structure model updating by sensitivity analysis. The proposed approach was applied to the aeroengine casing refined finite element modeling and model updating. For the local junction parameter updating, the maximal error was 064% for the substructure model updating method, and the computational efficiency improved by 515 times. These results demonstrate that the method can guarantee the accuracy of the model updating, and improve the numerical computational efficiency of the largescale complex structure.