Nonlinear dynamic behaviour of vertical and horizontal rotors in compliant liner tilting pad journal bearings: Some design considerations

2015 ◽  
Vol 82 ◽  
pp. 142-152 ◽  
Author(s):  
Matthew Cha ◽  
Sergei Glavatskih
Keyword(s):  
Nonlinear Dynamic ◽  
Dynamic Behaviour ◽  
Journal Bearings ◽  
Design Considerations ◽  
Tilting Pad ◽  
Tilting Pad Journal Bearings

Journal Vibration: Influence of Compliant Bearing Design

2012 ◽  
Author(s):  
Matthew Cha ◽  
Sergei Glavatskih
Keyword(s):  
Dynamic Response ◽  
Nonlinear Dynamic ◽  
Dynamic Behaviour ◽  
Journal Bearings ◽  
Design Parameters ◽  
Radial Clearance ◽  
White Metal ◽  
Tilting Pad ◽  
Bearing Design ◽  
Tilting Pad Journal Bearings

In this paper, the nonlinear dynamic behaviour of vertical and horizontal rotors in compliant tilting pad journal bearings has been investigated. White metal and compliant bearings with line pivot pads are compared. The dynamic response of four pad bearings with different preload factors is studied. The effect of viscoelasticity is also considered in comparison with purely elastic compliant and white metal liners. The influence of radial clearance and pad offset is analysed. It is shown how pad design parameters such as preload factor, pivot offset, viscoelasticity of the liner, and radial clearance can be selected to control the size of the journal orbit in compliant bearings.

scholarly journals Experimental Investigations on Tilting Pad Journal Bearings

1999 ◽  
Vol 5 (3) ◽  
pp. 181-191 ◽  
Author(s):  
Renato Brancati ◽  
Stefano Pagano ◽  
Ernesto Rocca ◽  
Michele Russo ◽  
Riccardo Russo
Keyword(s):  
Dynamic Behaviour ◽  
Experimental System ◽  
Journal Bearings ◽  
Operating Conditions ◽  
Experimental Investigations ◽  
Rigid Rotor ◽  
Tilting Pad ◽  
Set Up ◽  
The University ◽  
Tilting Pad Journal Bearings

The results of a survey conducted on an experimental system consisting of a rigid rotor supported on two radial bearings each with five tilting pads is presented. In particular, the system was set up in order to assess the dynamic behaviour of the bearing in unusual operating conditions. The response of the bearing to different unbalance values was determined after acquiring and analysing the orbits described by the journal axis for assigned unbalance values in different operating conditions. Analysis of the results shows some particular operating features that were not entirely predicted by the theoretical model and which may give rise to malfunctions in the rotor-tilting pad bearings system. The tests were carried out in the rotor dynamics laboratory of the Dipartimento di Ingegneria Meccanica per l'Energetica at the University of Naples.

Prediction of nonlinear dynamic coefficients of tilting-pad journal bearings with pad perturbation

2021 ◽  
pp. 135065012110548
Author(s):  
Mohammad Hojjati ◽  
Seyed Younes Farzanmehr ◽  
H. M. Navaz ◽  
Hassan Haddadpour
Keyword(s):  
Partial Derivative ◽  
Nonlinear Dynamic ◽  
Perturbation Technique ◽  
Journal Bearings ◽  
Eccentricity Ratio ◽  
Linear Dynamic ◽  
Dynamic Coefficients ◽  
Tilting Pad ◽  
Derivative Method ◽  
Tilting Pad Journal Bearings

In this paper, a modified partial derivative method is developed to predict the linear and nonlinear dynamic coefficients of tilting-pad journal bearings with journal and pad perturbation. To this end, Reynolds equation and its boundary conditions along with equilibrium equations of the pad are used. Finite difference, partial derivative method, and perturbation technique have been employed simultaneously for solving these equations. The accuracy of the results is investigated by comparing the linear dynamic coefficients of three types of tilting-pad journal bearings with those published the literature. It is shown that the nonlinear dynamic coefficients depend on Sommerfeld number, eccentricity ratio, and length to diameter ratio. Similar to the case of linear dynamic coefficients of TPJB, it is observed that the eccentricity ratio effects on nonlinear dynamic coefficients are more notable when the eccentricity ratio is higher than 0.8 or less than 0.2.

Nonlinear dynamic behaviors of a rod fastening rotor supported by fixed–tilting pad journal bearings

2014 ◽  
Vol 69 ◽  
pp. 129-150 ◽  
Author(s):  
Di Hei ◽  
Yanjun Lu ◽  
Yongfang Zhang ◽  
Zunyou Lu ◽  
Parag Gupta ◽  
...  
Keyword(s):  
Nonlinear Dynamic ◽  
Journal Bearings ◽  
Dynamic Behaviors ◽  
Tilting Pad ◽  
Rod Fastening Rotor ◽  
Tilting Pad Journal Bearings

Dynamic Behaviour of Tilting-Pad Journal Bearings

1995 ◽  
Vol 209 (4) ◽  
pp. 275-285 ◽  
Author(s):  
S Pagano ◽  
E Rocca ◽  
M Russo ◽  
R Russo
Keyword(s):  
Dynamic Behaviour ◽  
Static Load ◽  
Journal Bearing ◽  
Journal Bearings ◽  
Rigid Rotor ◽  
Tilting Pad ◽  
Non Linear ◽  
The Stability ◽  
Tilting Pad Journal Bearings

The dynamic behaviour of a rigid rotor on tilting-pad journal bearings system is analysed for balanced and unbalanced rotors. The study mainly regards a two-pad journal bearing symmetric with respect to the external static load. Both linear and non-linear behaviours have been analysed, with particular reference to the stability of the journal and pads equilibrium positions in the case of balanced or slightly unbalanced rotors, and to the stability of their synchronous motions in the case of considerable unbalance.

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