模型转子突加不平衡响应分析及试验验证

为准确获取风扇叶片飞失引起的瞬态载荷,利用显式动力学有限元仿真方法进行了接触建模和瞬态分析,开展了多层次的试验标定和校核工作,利用这些试验结果与分析进行了对比验证。结果表明:采用的显式动力学有限元仿真方法为准确模拟突加不平衡过程中的动态特征提供一种可行的仿真手段,形成了一套构件-组件-整机、从静力学到动力学的模型修正方法。按照测试优先级定义的主要传力路径载荷、突加不平衡载荷等物理量,确定了模型修正的测试参数选取方法。利用支承锥壁动应变测量数据,结合模型标定结果,可以准确地获得支点峰值径向动载荷,预测的峰值动态载荷与试验获取的结果误差小于10%,此方法可以运用到支点冲击载荷间接测量中,提高测量的精度及简便性。 

Analysis and test verification of model rotor sudden nbalanceresponse

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.