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针对航空发动机转子动力学设计需求,将有限元法与振型筛选法相结合,提出适于工程应用的临界转速求解方法,结合算例详细论述了完全法和缩减法的求解过程。研究结果表明:两种求解方法的结果完全一致,而缩减法求解过程迭代次数少,更为方便;某双转子系统,顺转时存在5阶临界转速,而反转时在相同的转速范围内将增加n=3,n=4和n=5的反进动临界转速,临界转速的密集性导致反转转子的动力学设计更为复杂。
Aero-engine rotor dynamics design requirements are combined with finite element method and vibration mode selection method to propose a critical speed solution method suitable for engineering applications. The complete method and the reduction method are discussed in detail with examples. The results show that the results of the two methods are exactly the same, and the reduction procedure is less iterative and more convenient. For a two-rotor system, there is a fifth-order critical speed in the clockwise rotation, while in the same speed range Will increase n = 3, n = 4 and n = 5 anti-start critical speed, the critical speed of the intensive lead to reverse rotor dynamics design more complicated.