Abstract
This research report discusses the dynamic behaviors of an axial-groove gas bearings-rotor system with rod-fastened structure. The time-based dependency-compressible Reynolds equation in the gas bearing nonlinear system is solved by the differential transformation method, and the continuous gas film forces of a three-axial-groove gas bearing are obtained. A dynamic mathematical model of the rotor system with rod-fastened structure supported in two- and three-axial-groove gas bearings with eight degrees of freedom is established. The dynamic motion equation of the rod-fastened rotor system is solved by the modified Newmark-β method based on disturbance compensation, which can reduce the computing error and improve computing stability. The dynamic characteristics of the rod-fastened rotor-gas bearing system are analyzed efficiently by the diversiform unbalance responses. The influence of the position angle of the pad on the nonlinear characteristics of the rod-fastened rotor system is also studied.
Highlights
Academic Editors: Ji Wang, Oil-free lubrication provides many unique characteristics for gas bearings, such as low friction, high positioning precision and low pollutant emission
The dynamic motion model of the rod-fastened rotor system can be solved by using the Newmark-β method; calculation errors may occur while a disturbance is produced by an increment of acceleration
Different from the cylindrical bearing and continuous integral rotor structure, in this report, a rod-fastened rotor and two- and three-axial-groove gas bearings are applied in the Different from the cylindrical bearing and continuous integral rotor structure, in bearing-rotor system
Summary
Academic Editors: Ji Wang, Oil-free lubrication provides many unique characteristics for gas bearings, such as low friction, high positioning precision and low pollutant emission. Liu et al [13] studied the nonlinear dynamic characteristics of a rigid rotor system with herringbone-grooved-journal gas bearings support, the onset speed and the whirl frequency ratio of subsynchronous vibration in the gas bearings-rotor system were estimated and analyzed. Based on time delays and feedback control gains, the dynamic behavior of the rotor supported by the self-acting three-axial-grooved gas-lubricated bearings were investigated by us [15], and a mathematical method used to obtain the dynamic characteristics of the nonlinear gas bearing-rotor system is presented. Based on the D’Alembert principle, a nonlinear dynamic hybrid model of the rod-fastened rotor was built by considering different rub-impact and initial permanent deflection; the effects of rotating speed and the length of initial permanent deflection on the dynamic behaviors of the journal bearing rod-fastened rotor system were analyzed. The effects of the position angle of the pad on the nonlinear dynamic behavior are investigated
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