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同时考虑非线性齿轮啮合力和非线性油膜力的影响,建立齿轮-转子-滑动轴承系统的动力学模型。研究2种强非线性因素的共同作用下,系统的非线性动态响应。研究结果表明:转速相对较低时,非线性啮合力对系统振动的影响较大;随着转速的升高,非线性油膜力对振动的影响逐渐增大,并出现“半频涡动”现象,而非线性啮合力的作用相对减小;在一定的转速范围内,“半频涡动”引起的频率成分的振幅甚至超过不平衡质量引起的1倍频的振幅。这是考虑非线性油膜力和非线性啮合力作用时得到的新的结论,这些结论是过去采用线性油膜力模型时难以得到的。
Considering the influence of nonlinear gear meshing force and nonlinear oil film force, the dynamic model of gear-rotor-slide bearing system is established. Under the combined action of two kinds of strong nonlinear factors, the nonlinear dynamic response of the system is studied. The results show that: when the rotational speed is relatively low, the nonlinear meshing force has a great influence on the system vibration; as the rotational speed increases, the influence of the nonlinear oil film force on the vibration gradually increases, and the “semi- ”Phenomenon, and the effect of non-linear meshing force is relatively reduced; within a certain speed range, the amplitude of the frequency component caused by the“ half-eddy ”even exceeds the amplitude of the first-order frequency caused by the unbalanced mass. This is a new conclusion obtained when considering the nonlinear oil film forces and nonlinear meshing forces. These conclusions are difficult to obtain when using the linear oil film force model in the past.