Influence of pivot design on nonlinear dynamic analysis of vertical and horizontal rotors in tilting pad journal bearings

2019 ◽  
Vol 140 ◽  
pp. 105859 ◽  
Author(s):  
Zhaoyang Shi ◽  
Yingze Jin ◽  
Xiaoyang Yuan
Keyword(s):  
Dynamic Analysis ◽  
Nonlinear Dynamic ◽  
Nonlinear Dynamic Analysis ◽  
Journal Bearings ◽  
Tilting Pad ◽  
Tilting Pad Journal Bearings

scholarly journals Nonlinear dynamic analysis of low viscosity fluid-lubricated tilting-pad journal bearing for different design parameters

Friction ◽  
2019 ◽  
Vol 8 (5) ◽  
pp. 930-944 ◽  
Author(s):  
Yingze Jin ◽  
Fei Chen ◽  
Jimin Xu ◽  
Xiaoyang Yuan
Keyword(s):  
Dynamic Analysis ◽  
Nonlinear Dynamic ◽  
Load Capacity ◽  
Nonlinear Dynamic Analysis ◽  
Design Parameters ◽  
Clearance Ratio ◽  
Low Viscosity ◽  
Nonlinear Design ◽  
Tilting Pad ◽  
Viscosity Fluid

Abstract To reveal nonlinear dynamic rules of low viscosity fluid-lubricated tilting-pad journal bearings (TPJBs), the effects of design parameters on journal center orbits and dynamic minimum film thicknesses of water-lubricated TPJBs with and without static loads are investigated. The hydrodynamic bearing force used in the nonlinear dynamic analysis is an approximate analytical solution including the turbulence effect. The results reveal the methods for vibration suppression and load capacity improvement and give an optimal pivot offset and clearance ratio that can maximize the minimum film thickness. The results also show that four-pad TPJBs with loads between pads are preferred due to good dynamic performance and load capacity. This study would provide some guidance for nonlinear design of low viscosity fluid-lubricated TPJBs under dynamic loads.

Nonlinear Dynamic Analysis of a Flexible Rotor Supported by Externally Pressurized Porous Gas Journal Bearings

2002 ◽  
Vol 124 (3) ◽  
pp. 553-561 ◽  
Author(s):  
Cheng-Chi Wang ◽  
Cheng-Ying Lo ◽  
Cha’o-Kuang Chen
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Behavior ◽  
Nonlinear Dynamic ◽  
Nonlinear Dynamic Analysis ◽  
Power Spectra ◽  
Journal Bearings ◽  
Operating Conditions ◽  
Flexible Rotor ◽  
Bearing Number ◽  
Rotor Mass

This paper studies the nonlinear dynamic analysis of a flexible rotor supported by externally pressurized porous gas journal bearings. A time-dependent mathematical model for externally pressurized porous gas journal bearings is presented. The finite difference method and the Successive Over Relation (S.O.R.) method are employed to solve the modified Reynolds’ equation. The system state trajectory, Poincare´ maps, power spectra, and bifurcation diagrams are used to analyze the dynamic behavior of the rotor and journal center in the horizontal and vertical directions under different operating conditions. The analysis reveals a complex dynamic behavior comprising periodic and quasi-periodic response of the rotor and journal center. This paper shows how the dynamic behavior of this type of system varies with changes in rotor mass and bearing number. The results of this study contribute to a further understanding of the nonlinear dynamics of gas-lubricated, externally pressurized, porous rotor-bearing systems.

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

2018 ◽  
Vol 94 (2) ◽  
pp. 1391-1408 ◽  
Author(s):  
Yihua Wu ◽  
Kai Feng ◽  
Yun Zhang ◽  
Wanhui Liu ◽  
Wenjun Li
Keyword(s):  
Dynamic Analysis ◽  
Nonlinear Dynamic ◽  
Nonlinear Dynamic Analysis ◽  
Tilting Pad ◽  
Rotor Bearing ◽  
Bearing System

Self-Excited Vibration of Statically Unloaded Pads in Tilting-Pad Journal Bearings

1983 ◽  
Vol 105 (3) ◽  
pp. 377-383 ◽  
Author(s):  
M. L. Adams ◽  
S. Payandeh
Keyword(s):  
Journal Bearing ◽  
Nonlinear Dynamic Analysis ◽  
Journal Bearings ◽  
Practical Significance ◽  
Oil Whip ◽  
Excited Vibration ◽  
Tilting Pad ◽  
Close Relationship ◽  
Tilting Pad Journal Bearing ◽  
Tilting Pad Journal Bearings

A time-transient nonlinear dynamic analysis is presented to study the motion of statically unloaded journal-bearing tilting pads. The major finding is that unloaded pads can exhibit a strong sub-synchronous self-excited vibration. The frequency of this periodic motion is somewhat below half the rotational speed and bears a close relationship to self-excited oil-whip vibration of rotors on lightly loaded non-tilting pad journal bearings. The identification of this type of self-excited pad vibration has practical significance to the solution of problems in applications involving damage to unloaded pads. A comprehensive parametric study is presented and shows which tilting-pad journal bearing parameters are significant to self-excited pad vibration and its elimination.

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