Based on Dynamic Model Modification Technology Vibration Analysis and Structure Optimization of Aerospace

Aiming at the bolt fracture accident of a certain type of aerospace electromechanical actuator (EMA) in the vibration test, a vibration analysis and structure optimization method based on dynamic model correction technology is proposed. According to the theory of structural dynamics and random vibration, the EMA dynamic model is constructed by analyzing the failure mechanism. In order to improve the accuracy of the virtual test, the model Verification and Validation (V&V) method is applied. Based on the test data, the QPLINK algorithm is used to modify the stiffness value of the bolt connection, so that the frequency difference between the first 3 orders of the model and the test result is within 8%, and the MAC value (modal confidence criterion) is above 0.8, which proves the accuracy of the method. Finally, the model is applied to improve the design scheme, which effectively improves the structural rigidity of EMA.