Theoretical Study on the Damping Efficiency of Squeeze Film Damper on Rotor

doi:10.3901/JME.2019.03.090

Abstract

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

CLC Number:

TH113

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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