转子挤压油膜阻尼器减振效率的理论研究

doi:10.3901/JME.2019.03.090

摘要/Abstract

摘要： 针对如何有效降低滚动轴承-转子系统振动幅值的问题，将挤压油膜阻尼器-滚动轴承-双盘转子系统作为研究对象，以雷诺方程、动压润滑理论、短轴承假设、油膜力周向边界条件、非线性赫兹接触理论等为基础，建立转子系统动力学方程，运用Newmark-β迭代数值求解方法结合Newton-Raphson迭代来求解转子系统相应节点的激励响应结果，分析该转子系统非线性动力学特性，从轴心轨迹图和时域曲线图两个方面对比有无挤压油膜阻尼器转子系统的位移响应，从理论角度对转轴振动能量被鼠笼支撑及挤压油膜部分有效吸收的程度进行研究，并对转子系统0～10 000 r/min转速区间下不同阻尼器参数情况下的减振效率进行考量，研究发现转子系统在转速相对较低时减振效果不佳，并分析其原因，研究结果可为转子系统挤压油膜阻尼器的结构参数设计提供理论依据。

关键词: 滚动轴承, 挤压油膜阻尼器, 减振效率, 转子系统

Abstract: According to the problem of how to effectively reduce the vibration amplitude of the rotor system supported by rolling bearings, using the squeeze oil film damper-rolling bearing-double disc rotor system as the research object, the dynamic equation of rotor system is established on the basis of the Reynolds equation, hydrodynamic lubrication theory, short bearing assumption, circumferential boundary conditions of oil film force and nonlinear Hertz contact theory. The results of excitation response at corresponding nodes of the rotor system are solved by utilizing the Newmark-β method combined with Newton-Raphson iteration, then the nonlinear dynamics of the rotor system is analyzed. The displacement responses of the rotor system in the case of the presence and absence of the squeeze film damper are compared with the two aspects of the orbit diagram of axle center and the time domain graph. Then whether the vibration energy of the rotating shaft is effectively absorbed by the squirrel cage and squeezed oil film is analyzed in theory. Moreover, the damping efficiency of different damper parameters is also studied in the 0~10 000 r/min speed range and the reasons for the poor damping efficiency when the rotor speed is relatively low are analyzed emphatically. The results of this study can provide theoretical basis for the design of structural parameters of the squeeze film dampers applied to rotor systems with different dynamic characteristics.

Key words: damping efficiency, rolling bearing, rotor system, squeeze film damper

中图分类号:

TH113

刘杨, 石拓, 辛喜成, 马亚新, 薛曾元, 明帅帅. 转子挤压油膜阻尼器减振效率的理论研究[J]. 机械工程学报, 2019, 55(3): 90-98.

LIU Yang, SHI Tuo, XIN Xicheng, MA Yaxin, XUE Zengyuan, MING Shuaishuai. Theoretical Study on the Damping Efficiency of Squeeze Film Damper on Rotor[J]. Journal of Mechanical Engineering, 2019, 55(3): 90-98.

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