An aviation engine was taken as an example to establish the engine vibration simulation system

and the different structural squeeze film damper (SFD) modeling methods affecting the vibration response of the whole engine were analyzed. Meanwhile

the multi-position and multi-sensor vibration response test of the steady working condition was adopted to verify the accuracy of the model. Based on the calculation of the whole machine vibration system model and the oil interruption test of this engine

the effects of the squeeze oil film damping value at the front fulcrum of the gas generator (No.1 fulcrum) and the rear fulcrum of the free turbine (No.3 fulcrum) on the engine were discussed. Under the stable condition

the result showed that the engine vibration response first decreased and then increased as the No.1 fulcrum oil film damping value increased

and decreased as the No.3 fulcrum oil film damping value increased. By reducing the squeeze oil film damping value at the No.1 fulcrum appropriately

the total vibration response of the engine could be reduced by 43.4% under the maximum continuous working condition.