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针对航空发动机转子系统的质量主要集中于压气机及涡轮部分的工程实际,将航空发动机转子系统简化为双盘悬臂连续体转子系统。建立含碰摩故障的双盘悬臂连续体转子—轴承—机匣耦合动力学模型,导出双盘悬臂连续体转子的四阶偏微分运动方程。运用变步长四阶龙格库塔法模拟系统的碰摩故障响应,分析转速与偏心量对系统碰摩故障响应的影响,发现该模型在发生碰摩故障时的一些非线性动力特性,为解决工程实际问题提供一定的理论依据。通过所建模型与单盘转子模型振动特性的比较,验证建立模型的必要性与工程意义。
Aeroengine rotor system for the quality of the main focus on the compressor and turbine part of the engineering practice, the aeroengine rotor system is simplified as two-disc cantilever continuum rotor system. The coupling dynamics model of double-disc cantilever continuum rotor-bearing-casing with rub-impact fault is established and the fourth-order partial differential equations of motion of the dual-disc cantilever continuum rotor are deduced. The fourth-order Runge-Kutta method was used to simulate the rub-impact fault response of the system, and the influence of rotational speed and eccentricity on the rub-impact fault response of the system was analyzed. Some nonlinear dynamic characteristics of the model were found to be Solve the engineering problems to provide a theoretical basis. Through the comparison of the vibration characteristics between the model and the single disc rotor model, the necessity and engineering significance of the model are verified.