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以双转子航空发动机为研究对象,建立了航空发动机双转子-滚动轴承-机匣耦合动力学模型.模型中考虑了低压转子与高压转子的中介轴承耦合作用,滚动轴承模型中考虑了滚动轴承间隙、非线性赫兹接触力以及变柔性VC(varying compliance)振动等因素.利用仿真模型,进行了同向和反向旋转双转子系统的拍振响应分析,结果表明当高低压转子的转速差较小时,双转子系统的拍振响应明显.同时研究了同转和反转双转子系统轴心轨迹响应的差异,研究表明反向旋转双转子系统的轴心轨迹会形成“花瓣”状.最后,利用双转子试验器验证了仿真结果的正确性,进一步验证本文所建模型的正确性.
A twin-rotor aeroengine was chosen as the research object to establish a two-rotor-rolling bearing-casing coupling dynamics model of aeroengine, in which the coupling between the low-pressure rotor and the high-pressure rotor was considered, the rolling bearing clearance was considered in the rolling bearing model, Hertzian contact force, varying compliance vibration and so on.Using the simulation model, the analysis of the beat response of the two-rotor system with the same direction and the opposite direction rotation is carried out. The results show that when the rotational speed difference between the high and low pressure rotors is small, The difference between the responses of the two-rotor system and the two-rotor system is studied.It is shown that the orbital trajectory of the dual-rotor system will form a “petal” shape.Finally, The rotor tester verifies the correctness of the simulation results and further verifies the correctness of the model built in this paper.