液体动静压球轴承轴心运动轨迹研究

为研究外载荷对轴承转子系统稳定性的影响，以小孔节流的液体动静压球轴承转子系统为研究对象，建立液体动静压球轴承转子系统动力学模型。通过求解轴承润滑数学模型获得非线性油膜力，分析转子所受到的外载荷，采用欧拉算法预测出轴心下一个时刻位移、速度和加速度，并分析转子系统质量、不平衡载荷和阶跃载荷对转子回转精度的影响。结果表明：随着转子系统质量的增加，所需平衡的油膜力增加，轴心振动幅度增加，从而导致转子回转精度降低；相对于不考虑不平衡载荷，考虑不平衡载荷后其振动形态为椭圆且振动幅值增大，减小不平衡值将减小振幅并提高旋转精度；随着阶跃载荷的增加，达到平衡所需的时间也增加。

Research on the Journal Center Motion Trajectory of Spherical Hybrid Sliding Bearings

In order to study the influence of external load on the stability of the rotor bearing system,the dynamic model of the rotor system of spherical hybrid sliding bearings with orifice throttling was established.The bearing lubricating mathematical model was solved,and the nonlinear oil film force was obtained.The external load on the rotor was analyzed,the Euler algorithm was used to predict the displacement,velocity and acceleration of the shaft center at the next time,and the influence of rotor system mass,unbalanced load and step load on the rotor motion trajectories was analyzed.The results show that the increase of the rotor system mass leads to the increase of the oil film force and the shaft center vibration amplitude,thereby reducing the rotary accuracy of the rotor.Compared to not considering unbalanced loads,the vibration shape is elliptical and the vibration amplitude increases after the unbalanced load is considered.Reducing the unbalance value will reduce the vibration amplitude and increase the rotary accuracy.As the step load increases,the equilibrium convergence time also increases.