Research on super-element condensation method of aero-engine magazine structure dynamic model considering connections

ObjectiveAiming at the low dynamic solution efficiency caused by the complex structure, numerous substructures and connections, and a large number of nodes in the finite element model of aero-engine magazine, a super-element condensation method for the dynamic model of magazine structure with connections was proposed to achieve efficient and accurate solution.MethodsFirstly, a bolt-connected magazine was taken as the research object, and super-element substructures and residual structure were divided based on its physical connection structure. Secondly, external nodes on the connection surface were defined, and the super-element substructures were condensed to the connection surface of the residual structure. Then, each structure was assembled to obtain the condensed model. Finally, the effectiveness of the method was verified by a modal test using the hammering method.ResultsThe modal solution time of the condensed model was reduced from 623 s to 21 s, the maximum error of the simulation frequency before and after condensation was 0.79%, and the average error compared with the test frequency was 0.35%, which greatly improved the computational efficiency while ensuring high modeling accuracy.