Experimental study on pad temperature and film thickness of tilting-pad journal bearings with an elastic-pivot pad

Zhang, Fan; Ouyang, Wu; Hong, Honglun; Guan, Yongsheng; Yuan, Xiaoyang; Dong, Guangneng

doi:10.1016/j.triboint.2015.03.030

Cited by 42 publications

(19 citation statements)

References 17 publications

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“…The pad temperature and film thickness of two real-size three-pad TPJBs were studied in [25] with an elastic-pivot pad. The flexible rotor-active TPJB modelling with hybrid lubrication was thoroughly covered in [26,27].…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Pivot Stiffness on the Performances of Five-Pad Tilting Pad Bearings

2019

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The role of the pivot flexibility in tilting-pad journal bearings (TPJBs) has become essential, particularly for bearings working at high applied load and relatively high rotor speeds. Predictions from a simple bearing model with rigid pivots show incorrect estimation of the dynamic coefficients in comparison with the experimental results. Normally, the more flexible the pad pivot, the lower the dynamic coefficients because the stiffness of the pivot takes in series with the stiffness and damping of the oil film. This paper investigates the influence of pivot stiffness on the dynamic force coefficients of two different five-pad TPJBs as a function of the applied static load and excitation frequency: rocker-backed pivot and spherical pivot bearings. In order to highlight the effect of the pivot stiffness in the spherical pivot bearing, displacement restriction components and elastic copper made shims have been used. Firstly, a thermo-elasto-hydrodynamic model for the static and dynamic characteristics of the two bearings is described. This model takes into account the flexibility of both pad and pivot. The pivot stiffnesses calculated by means of the Hertz theory and those obtained by experiments have been introduced and compared in the model. The clearance profiles of two tested bearing and the shaft center loci obtained by measurement and prediction are also shown. The dynamic coefficients of the two bearings obtained from the numerical simulation were compared with the experimental results. By the analysis it can be concluded that the effect of the pivot flexibility on the clearance profile, the shaft locus and on the dynamic coefficients is very significant. More important, it is important to estimate the pivot stiffness of each single pad using experimental measurements.

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Section: Introductionmentioning

confidence: 99%

The Effect of the Pivot Stiffness on the Performances of Five-Pad Tilting Pad Bearings

2019

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“…Widely used in heavy rotating machinery, fluid-film bearings can form a pressurized fluid film through a hydrodynamic or hydrostatic effect [33][34][35]. The journal will be separated from the bearing bore by the fluid film, and the mechanical contacting will be transferred into a solid-liquid mode.…”

Section: Fluid-film Bearingsmentioning

confidence: 99%

An Overview of Bearing Candidates for the Next Generation of Reusable Liquid Rocket Turbopumps

Miao

et al. 2020

Chin. J. Mech. Eng.

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There is a consensus in the aerospace field that the development of reusable liquid rockets can effectively reduce the launch expense. The pursuit of a long service life and reutilization highly depends on the bearing components. However, the rolling element bearings (REBs) used in the existing rocket turbopumps present obvious and increasing limitations due to their mechanical contacting mode. For REBs, high rotational speed and long service life are two performance indexes that mutually restrict each other. To go beyond the DN value (the product of the bearing bore and rotational speed) limit of REBs, the major space powers have conducted substantial explorations on the use of new types of bearings to replace the REB. This review discusses, first, the crucial role of bearings in rocket turbopumps and the related structural improvements of REBs. Then, with the prospect of application to the next generation of reusable liquid rocket turbopumps, the bearing candidates investigated by major space powers are summarized comprehensively. These promising alternatives to REBs include fluid-film, foil, and magnetic bearings, together with the novel superconducting compound bearings recently proposed by our team. Our more than ten years of relevant research on fluid-film and magnetic bearings are also introduced. This review is meaningful for the development of long-life and highly reliable bearings to be used in future reusable rocket turbopumps.

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“…It is necessary to maintain a very small working clearance for applying hydrodynamic effect, which would probably cause rubbing phenomena between superconducting pad and magnet rotor under large impact load. 23 It is meaningful to study tribological performance between them.…”

Section: Fundamental Tribological Experiments Of Novel Superconductinmentioning

confidence: 99%

Fundamental tribological experiments and antifriction design of novel superconducting tilting pad bearing for liquid rocket engine

Jia

Zhang

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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Novel superconducting tilting pad bearing can realize the compound of superconducting magnetic force and hydrodynamic fluid-film force in liquid rocket engine and possesses the advantages of larger bearing capacity and higher stiffness. The indispensable small operational clearance for the bearing would possibly cause rubbing phenomena between superconducting stator and magnet rotor under impact loads. Three Y1.8Ba2.4Cu3.4Ox bulk superconductors with different crystal domains are used to study the dry friction coefficients between superconductor and neodymium iron boron (NdFeB) magnet with nickel coating. In order to improve the fundamental tribological performance of the novel bearing, upper surface of modified superconducting tilting pad is covered by thin impregnated graphite and the nickel coating of magnet is replaced by chromium coating. Pin-on-disc experimental results indicate that the antifriction design method is effective and safe for liquid rocket engine. This study can promote the application process of novel superconducting bearing in a new generation of liquid rocket engine in China.

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Experimental study on pad temperature and film thickness of tilting-pad journal bearings with an elastic-pivot pad

Cited by 42 publications

References 17 publications

The Effect of the Pivot Stiffness on the Performances of Five-Pad Tilting Pad Bearings

The Effect of the Pivot Stiffness on the Performances of Five-Pad Tilting Pad Bearings

An Overview of Bearing Candidates for the Next Generation of Reusable Liquid Rocket Turbopumps

Fundamental tribological experiments and antifriction design of novel superconducting tilting pad bearing for liquid rocket engine

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