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针对双转子航空发动机的动力学特性问题展开研究,以传递矩阵法为基础,建立数学计算模型,引用经实验验证的算法,结合某型航空发动机双转子的实际结构,对其动力学特性进行理论计算,对结果进行分析,得出结论,为航空发动机转子动力学特性的调整和发动机的故障诊断提供了一些理论参考。计算结果表明:该发动机转子在额定工作转速范围内存在一阶临界转速,但临界转速远离工作转速,说明柔性转子设计合理。双转子系统中由于中介轴承的耦合作用,一个转子的临界转速随另一个转子转速的增加而增加。
Based on the transfer matrix method, a mathematic calculation model is established based on the transfer matrix method. Based on the experimental verification of the algorithm and the actual structure of a twin-rotor aero-engine, the dynamic characteristics of the twin-rotor aeroengine are studied theoretically The results are analyzed and the conclusion is reached. It provides some theoretical references for the adjustment of aeroengine rotor dynamics and engine fault diagnosis. The calculation results show that there is first-order critical speed in the rated working speed range of the engine rotor, but the critical speed is far away from the working speed, indicating that the flexible rotor design is reasonable. Due to the coupling of intermediate bearings in a two-rotor system, the critical speed of one rotor increases with the increase of the other rotor speed.