Nonlinear dynamic analysis of a rotor-bearing system with porous tilting pad bearing support

Wu, Yihua; Feng, Kai; Zhang, Yun; Liu, Wanhui; Li, Wenjun

doi:10.1007/s11071-018-4431-7

Cited by 22 publications

(7 citation statements)

References 15 publications

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“…The amplitude only slightly increased at high external supply pressure. The results are similar to those in Ref [14].…”

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confidence: 92%

Nonlinear Dynamic Analysis of a Rotor-Porous Air Journal Bearing System With O-Rings Mounted

Zhang

Feng

et al. 2021

Preprint

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Porous air journal bearings (PAJBs) with O-rings mounted are regarded as a potential choice to offer air levitation with a large load capacity and optimal start/stop characteristics, which are required in small-size and high-efficiency turbomachinery. However, the coupling of the mechanical properties of the O-rings and lubrication induce strong nonlinear characteristics, thereby affecting the dynamic responses of the rotor. In this study, a numerical model is presented, which is coupled with the excitation frequency-influenced stiffness and damping characteristics of O-rings, the Darcy’s laws, air motion equations established by the air lubrication model, and the rotor and bearing motion equations. The model is well verified by the experimental results. The effect of the different system parameters on the performance of the rotor-PAJB system (RPS) is studied by analyzing the bifurcation diagrams, orbit, Poincaré maps, and FFT plots. Results show that the motion of the rotor is changed between periodic and quasi-periodic with the variation in rotational speed, external supply pressure, bearing clearance, and porous permeability. With O-rings mounted, the stability of RPS can be increased to hinder the rotor motion from changing from periodic to quasi-periodic. The effectiveness in increasing the stability of the RPS for the O-rings with SBR as the material is better than that with NBR but weaker than that with VMQ. Moreover, only a few number of O-rings have better effects on improving the stability of the RPS.

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“…The amplitude only slightly increased at high external supply pressure. The results are similar to those in Ref [14].…”

supporting

confidence: 92%

Nonlinear Dynamic Analysis of a Rotor-Porous Air Journal Bearing System With O-Rings Mounted

Zhang

Feng

et al. 2021

Preprint

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“…Substituting Equations (3) and (5) into Equation (2) simultaneously, the dimensionless mass continuity equation for coupling clearance and porous graphite is given as follow:…”

Section: Modelling the Lubrication Gasmentioning

confidence: 99%

“…Based on the types of restrictor, the aerostatic bearings can be classified as conventional orifice‐restricted aerostatic bearings and porous gas bearings 2,3 . Comparing with conventional orifice‐restricted aerostatic bearings, porous gas bearings are widely investigated because of their advantages of simple design, pressurised gas that is uniformly distributed into the bearing clearance and high load capacity 4,5 …”

Section: Introductionmentioning

confidence: 99%

“…2,3 Comparing with conventional orificerestricted aerostatic bearings, porous gas bearings are widely investigated because of their advantages of simple design, pressurised gas that is uniformly distributed into the bearing clearance and high load capacity. 4,5 Early investigations on porous gas bearings were mainly focused on the bearing performance with neglecting the influence of shaft rotation. [6][7][8] However, with the increasing in rotational speed, the aerodynamic effect in the gas film clearance becomes highly significant.…”

Section: Introductionmentioning

confidence: 99%

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Numerical and experimental investigation on the performance of hybrid porous gas journal bearings

Wang

Zhao

et al. 2020

Lubrication Science

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As the progress of the high-speed performance requirement for porous gas journal bearings continuing, the aerodynamic effect, which plays a key role in the state of lubrication, causes the porous gas journal bearings being gradually to be used as hybrid bearings. This paper firstly presents a theoretical analysis on the lubrication mechanism of the hybrid bearings. The gas flow in the porous and clearance is modelled by using the mass continuity equation. Two

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“…Both Li and Xu adopted the dynamic coefficient method in their model, however it may lose the numerical accuracy when taking this method which indeed largely improved the efficiency. By contrast, the restoring force commonly used in 2-DOF models aims to obtain force directly by solving the transient Reynold equation [ 24 , 25 ], and it can also obtain the torque in a 5-DOF model. It can be optimized of the dynamic coefficient method, but if this measure is taken, massive extra work needs to be done.…”

Section: Introductionmentioning

confidence: 99%

Multi-Field Coupling Dynamics Modeling of Aerostatic Spindle

Chen

2021

Micromachines

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The aerostatic spindle in the ultra-precision machine tool shows the complex multi-field coupling dynamics behavior under working condition. The numerical investigation helps to better understand the dynamic characteristics of the aerostatic spindle and improve its structure and performance with low cost. A multi-field coupling 5-DOF dynamics model for the aerostatic spindle is proposed in this paper, which considers the interaction between the air film, spindle shaft and the motor. The restoring force method is employed to deal with the times varying air film force, the transient Reynolds equation of the aerostatic journal bearing and the aerostatic thrust bearing is solved using ADI method and Thomas method. The transient air film pressure of aerostatic bearings is obtained which clearly presents the influence induced by the tilt motion of the spindle shaft. The motion trajectory of the spindle shaft is obtained which shows different stability of the shaft under different external forces. The dynamics model shows good performance on simulating the multi-field coupling behavior of the aerostatic spindle under external force. which is quite meaningful and useful for the further research on the dynamic characteristics of the aerostatic spindle.

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Nonlinear dynamic analysis of a rotor-bearing system with porous tilting pad bearing support

Cited by 22 publications

References 15 publications

Nonlinear Dynamic Analysis of a Rotor-Porous Air Journal Bearing System With O-Rings Mounted

Nonlinear Dynamic Analysis of a Rotor-Porous Air Journal Bearing System With O-Rings Mounted

Numerical and experimental investigation on the performance of hybrid porous gas journal bearings

Multi-Field Coupling Dynamics Modeling of Aerostatic Spindle

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