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以带机匣的航空发动机转子试验器为研究对象,建立了模拟实际发动机安装条件下试验器的整机有限元模型。对试验器进行了整机模态试验,并利用试验器的模态试验结果对有限元模型进行了修改和验证。在此基础上,仿真计算了自由安装边界、固定安装边界和不同安装节刚度的弹性安装边界的试验器前3阶固有频率和模态振型,通过定义转静耦合因子,研究了安装节刚度对试验器转子、静子耦合程度的影响。结果表明:模态振型的转子、静子耦合程度越高,安装条件对该阶模态影响越大,并且安装节刚度对转子、静子耦合程度影响是非线性的。由于实际大型涡扇发动机的在很多模态下均存在转子、静子耦合现象,因此安装节的刚度对转子、静子耦合作用的影响不容忽视,在有限元建模和仿真计算中需要仔细考虑。
Taking aeroengine rotor tester with casing as the research object, a complete finite element model of the testor simulating the actual engine mounting was established. The modal test was carried out on the tester, and the finite element model was modified and validated by the modal test results of the tester. On this basis, the first three natural frequencies and modal vibration modes of the tester, which are freely installed boundary, fixed installation boundary and rigid installation boundary of different installation joints, are simulated. By defining the static and dynamic coupling factors, Effect on the coupling degree of rotor and stator of tester. The results show that the higher the coupling degree of the rotor and the stator is, the greater the influence of the installation conditions on the modal is, and the influence of the stiffness of the mounting section on the coupling degree of the rotor and the stator is nonlinear. Due to the coupling of rotor and stator in many modes of actual large turbofan engine, the influence of the stiffness of the mounting section on rotor and stator coupling can not be neglected and needs to be carefully considered in the finite element modeling and simulation.