两种不同载荷形式下转子系统油膜失稳的数值研究

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A single span rotor system with two discs is studied in this paper. Aiming at the oil-film instability problem of the sliding bearing at a high speed, a lumped mass model of the rotor system considered with the gyroscopic coupling effect is es- tablished. The graphite self-lubricating bearing and the sliding bearing are simulated by spring-damping model and the no-linear oil-film force model of the short bearing, respectively. By the spectrum cascade and a rotor orbit, an oil-film instability rule and the complicated non-linear dynamic characteristics of the rotor system are analyzed under two different load conditions （the ec- centricities of two discs in the same and opposite phases）. The result shows that oil-film instability can excite complicated the combination frequency components of the rotating frequency and the whirl/whip frequency; the eccentricity with the opposite phase can improve the instability speed compared with that of the eccentricity with the same phase and excite complicated com- bination frequency components related to the two order oil whip frequencies. The results have important significance for the mechanism and the fault diagnosis of oil-film instability.以单跨双盘转子系统为研究对象，针对滑动轴承在高转速时容易出现的油膜失稳问题，建立了考虑陀螺影响的转子系统集中质量模型，含油石墨轴承和滑动轴承分别采用弹簧一阻尼模型和短轴承非线性油膜力模型，通过三维谱图和轴心轨迹，分析了两种不同载荷工况下（两圆盘偏心同相位和反相位），转子系统的油膜失稳规律及系统复杂非线性动力学特性。研究结果表明：油膜失稳会激起复杂的转频和失稳频率的组合频率成分，偏心反相位比偏心同相位提高了失稳转速，且在较高转速时能激起系统二阶油膜振荡频率，并激发与二阶油膜振荡频率相关的组合频率成分。研究结果对转子油膜失稳故障机理及故障诊断具有重要意义。