传递函数法轴承-转子系统不平衡响应抑制

发布时间：2018-05-12 22:18

本文选题：传递函数 + 轴承-转子系统　；参考：《西安交通大学学报》2017年12期

【摘要】：为了解决残余不平衡力随着转子同步高速旋转时导致轴承-转子系统产生不平衡响应的问题,提出适当增大偏心率以提高油膜刚度、进而抑制不平衡响应的方法。基于动静压柔性铰链可倾瓦轴承,首先结合流量平衡原理与液体润滑雷诺方程得出轴瓦油膜的压力分布模型,并建立转子运动方程以及瓦块力矩平衡方程;然后提出轴承-转子系统的简化方法,并根据得到的简化系统的运动微分方程推导系统的标准传递函数;最后为确定人为增大偏心率的实施方案,研究了轴心定位策略,并通过最小二乘拟合法得到轴心位置-控制力方程。数值仿真结果表明:轴心定位策略能实现较高的定位精度,不平衡响应的抑制效果显著,x和y方向的振动幅值均降低为原来的10%左右。适当增大偏心率使得油膜刚度提高,能够有效抑制轴承-转子系统的不平衡响应。
[Abstract]:In order to solve the problem that the residual unbalance force causes the unbalanced response of the bearing-rotor system when the residual unbalance force rotates with the rotor synchronously, a method of increasing the eccentricity to increase the oil film stiffness is put forward to suppress the unbalanced response. Based on the static and static pressure flexure hinge tilting pad bearing, the pressure distribution model of the bearing oil film is obtained by combining the flow balance principle with the Reynolds equation of liquid lubrication, and the rotor motion equation and the tile moment balance equation are established. Then the simplified method of bearing-rotor system is put forward, and the standard transfer function of the system is deduced according to the motion differential equation of the simplified system. Finally, in order to determine the implementation scheme of artificially increasing eccentricity, the strategy of axis location is studied. The axial position-control force equation is obtained by least square fitting method. The numerical simulation results show that the axial positioning strategy can achieve higher positioning accuracy, and the suppression effect of unbalanced response is significantly reduced to about 10% of the original vibration amplitude in the direction of x and y. When the eccentricity is increased properly, the oil film stiffness can be improved, and the unbalanced response of the bearing-rotor system can be effectively suppressed.
【作者单位】：山东大学机械工程学院;
【基金】：国家自然科学基金资助项目(51575318)
【分类号】：TH133

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