模型转子突加不平衡响应分析及试验验证

In order 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 the dynamic 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 selection of 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 the test observation. This method can be applied to indirect measurement of the impact load, so as to improve the accuracy and simplicity of the measurement.