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为排查超高速转子系统碰摩故障的原因,利用混沌、分岔理论,研究了碰摩转子动力学特性。以实际转子结构为对象,建立物理模型,由拉格朗日(Lagrange)法建立系统动力学方程并数值求解,结合分岔图、轴心轨迹、相图、Poincare映射等手段,考察了碰摩转子的动力学行为及系统参数变化对其动力学特性的影响。研究结果表明:质量盘之间的动力耦合效应较弱,有利于系统稳定性;既定转子结构不致引起高速混沌状态进而导致碰摩。研究内容为探求故障原因提供了依据,所涉及的故障分析方法和过程可作为系列化微型涡喷发动机设计的参考。
In order to investigate the cause of Rub-Impact fault in super-speed rotor system, the dynamic characteristics of Rub-Rub rotor were studied by using chaos and bifurcation theory. Taking the actual rotor structure as the object, the physical model was established. The system dynamics equation was established by Lagrange method and solved numerically. Combining bifurcation diagram, axial trajectory, phase diagram and Poincare mapping, The Dynamic Behavior of Rotors and the Influence of System Parameters on Their Dynamic Characteristics. The results show that the dynamic coupling effect between the mass plates is weak, which is in favor of system stability. The established rotor structure can not cause high-speed chaos and lead to rubbing. The research contents provide the basis for exploring the causes of faults, and the methods and processes involved in fault analysis can serve as a reference for the design of a series of micro-turbojet engines.