某级压气机叶盘系统失谐振动关键因素研究

基于某级压气机叶片盘扇区，建立考虑非线性榫接触叶片盘有限元模型，应用提出的自由界面子结构-固定界面预应力模态综合超单元近似分析方法，并基于提出的围绕实验与有限元分析拟合出线性表达式的失谐参数识别方法，探究失谐关键因素对于叶盘系统振动的影响.结果表明，非线性榫接触不可忽略，提出的超单元法精度达到3.07%，满足要求.同时也表明，叶片平均频率、叶盘刚度比与频率转向对于失谐叶盘系统振动幅值、共振频率及应变能等参数均有一定影响. 

Study on key factors of mistuned vibration for blade-disk system of some-stage compressor

Based on the blade disk basic sector of certain stage compressor, blade disk finite element model considering non-linear tenon contact was established, free-interface substructure-fixed interface prestressed modal synthesis super element approximate analysis method was proposed, meanwhile, mistuned parameters recognition method of linear expression was fitted based on the blade static-frequency test and dichotomy combined with finite element analysis, exploring the effects of mistuning key factors on blade disk vibration. Results show that the non-linear tenon contact cannot be neglected, and the accuracy of super element method is 3.07%, so the proposed method meets the requirement. In addition, blades mean frequency, disk stiffness ratio and frequency veering have an effect on mistuned bladed disks vibration amplitude, resonance frequency and strain energy and other parameters.