Inorder to accurately obtain the transient load caused by fan blade out

contact modeling and transient analysis were carried out by explicit dynamic finite element simulation method. Multi-level calibration and verification test were performed

and these test results were compared with the analysis. The comparison results showed that the explicit dynamic finite element simulation method can provide a feasible simulation method for accurately simulating thedynamic characteristics of sudden unbalance process

and a set of model updating methods from parts

components to whole finite element model

from statics to dynamics were formed. According to the physical quantities such as main path load and sudden unbalanced load defined by the test priority

the selectionof test parameters for model updating was determined. With the calibration results of the model

the peak radial dynamic load can be accurately obtained by using the dynamic strain measurement data of the bearing cone

and the prediction error of peak dynamic load was within 10% compared with thetest observation. This method can be applied to indirect measurement of the impact load

so as to improve the accuracy and simplicity of the measurement.