润滑油温度对碰摩转子—轴承系统稳定性的影响

Effect of Lubricating Oil Temperature on the Stability of Rub Rotor-Bearing System

以故障转子-轴承系统油膜力与碰摩力相互作用为背景,建立了转子—轴承系统非线性动力学方程,探究了润滑油温度对系统稳定性的影响,采用四阶Runge-Kutta法求解动力学方程并分析该系统的稳态特征,得到该系统在油温分别为0、40、80℃时系统的分岔图、频率瀑布图、时域图、轴心轨迹图、频谱图及庞加莱图,揭示了系统的非线性行为。研究表明,温度主要影响油膜涡动发生的转速与振幅,转速升高至油膜震荡后系统的振动以油膜震荡为主。

Based on the interaction between oil film force and rub impact force of fault rotor bearing system, the nonlinear dynamic equation of rotor bearing system was established to explore the impact of lubricating oil temperature on the system stability. The four-order Runge-Kutta method was used to solve the dynamic equations and analyze the steady-state characteristics of the system. The bifurcation diagrams, frequency-waterfall diagrams, time-domain diagrams, axis orbit diagrams, poincare map diagrams, and frequency spectra diagrams of the system at oil temperatures of 0 ℃, 40 ℃, 80 ℃ were determined to reveal the nonlinear behavior of the system. The results show that the temperature mainly affects the speed and amplitude of the oil film whirl. When the speed increases to oil file oscillation, the vibration of the system is mainly oil film whirl.