To tackle the challenge of balancing accuracy and computational efficiency in aero engine model-ing,a method for dimensionality reduction and model modification of an aero engine simulator was proposed,in-corporating considerations of contact stiffness.Three-dimensional finite element models for the rotor and casing were created and thin-layer element technology was simulated the end tooth contact interface between the rotor disks and the bolt contact interface between the casing.The models were dimensionally reduced using fixed inter-face modal synthesis,preserving critical master nodes at contact interfaces and support positions,resulting in di-mensionality reduction models of both the rotor and the casing.Contact stiffness modifications were made to the dimensionality reduction models of the rotor and casing based on the results of rotor modal test and casing modal test,employing the sensitivity method.The modified rotor dimensionality reduction model and the modified cas-ing dimensionality reduction model were assembled into the final simulation model and compared with experimen-tal data through modal tests.The results indicate that the modified model's frequency errors for the first two bend-ing modes stayed within 1.22%,and the iterative calculation process was executed 5 times,using Matlab,with each iteration averaging 2.1 s per iteration,confirming the precision and effectiveness of the method.The re-search results provide a new and effective method for aero engine modeling and modification,which not only meets the modification accuracy of aero engine simulator,but also significantly improves the computational effi-ciency of model modification.
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