Nonlinear and linearised analyses of a generic rotor on single-pad foil-air bearings using Galerkin Reduction with different applied air film conditions

Ghalayini, Ibrahim; Bonello, Philip

doi:10.1016/j.jsv.2022.116774

Cited by 14 publications

(16 citation statements)

References 25 publications

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“…The experimental part of the study has been performed for the investigated GFB using the two standard measurement configurations [ 32 , 38 ]. Specifically, while initiating experiments for a newly-designed and constructed bearing, a common testing procedure is introduced, considering: (1) a freely-suspended (also known as floating) configuration, and (2) two-node support configuration.…”

Section: Experiments–investigated Casesmentioning

confidence: 99%

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Thermal Characterization of a Gas Foil Bearing—A Novel Method of Experimental Identification of the Temperature Field Based on Integrated Thermocouples Measurements

Martowicz

Zdziebko

Roemer

et al. 2022

Sensors

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Maintenance of adequate thermal properties is critical for correct operation of a gas foil bearing. In this work, the authors present the results of the experimentally conducted thermal characterization of a prototype installation of the bearing. A novel method of temperature identification, based on integrated thermocouples readings, has been employed to determine the thermal properties of the specialized sensing top foil mounted in the tested bearing. Two measurement campaigns have been subsequently completed, applying freely-suspended and two-node support configurations, to gather complementary knowledge regarding the bearing’s operation. Apart from the rotational speed and temperature field measurements, the authors have also studied the friction torque and the shaft’s journal trajectories based on its radial displacements. The temporal courses for the above-mentioned quantities have enabled inference on the effects present during run-up, run-out and stable state operation at a constant speed. As confirmed, the applied distribution of the integrated sensors allows for temperature readings on the entire outer surface of the foil, and therefore, provides useful data for the bearing characterization. The work is concluded with presentation of the recommended directions regarding future improvements of the proposed measurement technique and more comprehensive study of the bearing’s characteristics.

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Section: Experiments–investigated Casesmentioning

confidence: 99%

“…The relationships between the rotational speed, the assembly preload and the temperature are discussed in [ 30 , 31 ]. Moreover, an overview on the modeling methods for GFB, including temperature simulations, can be found in [ 2 , 9 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

Thermal Characterization of a Gas Foil Bearing—A Novel Method of Experimental Identification of the Temperature Field Based on Integrated Thermocouples Measurements

Martowicz

Zdziebko

Roemer

et al. 2022

Sensors

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“…1, wherein the rotor is supported by a 1 st generation single (360º)-pad FAB towards the right hand end, and by a rolling-element bearing (REB) at the left hand end, at which the rotor is driven by a motor via a flexible coupling. The following analysis follows the manipulation and nomenclature of [9] but with modification for variable radial clearance.…”

Section: Rotordynamic System Modellingmentioning

confidence: 99%

“…This method does not use a mesh/grid and was shown to considerably reduce the number of differential equations to be solved without any significant loss in accuracy. There appears to have been no research into order reduction of fully-coupled rotor-FAB systems since [3,4], until the works of [8], [9] published in 2021, 2022 respectively. The work of [8] involves a hybrid GR-FD method which retains FD for the 𝜗 direction and introduces GR (limited to first-order only) for the axial (𝜉) domain.…”

Section: Introductionmentioning

confidence: 99%

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The Application of the Arbitrary-Order Galerkin Reduction Method to the Dynamic Analysis of a Rotor With a Preloaded Single-Pad Foil-Air Bearing

Ghalayini

Bonello

2022

Journal of Engineering for Gas Turbines and Power

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The compressible Reynolds Equation (RE) is typically integrated within a fully-coupled dynamical foil-air bearings (FABs)-rotor system via spatial discretisation transformation e.g. Finite Difference (FD), Finite Element (FE). An alternative way of integrating the RE is through Galerkin Reduction (GR). The motivation for using GR is the computational benefit coming from the drastic condensation of the problem due to the elimination of the two-dimensional grid used for the air film in FD or FE. This paper presents a novel application of arbitrary-order GR to both nonlinear and linearised analyses of rotor systems supported by single-pad FABs with variable radial clearance (preload). Simulations using FD gave close correlation with those using GR for all preloads, with discrepancies increasing as the preload approaches the nominal clearance (c). The simulations show that the preload has to exceed a certain level in order to delay the onset of instability speed (OIS), and significant delay in OIS and suppression of sub-synchronous vibration is possible when the preload is comparable to c. Experimental validation is provided.

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On the Nonlinear Dynamics of a Rigid Rotor Supported by Shimmed Conical Gas Foil Bearings

Sarrazin,

Liebich

2023

Mechanisms and Machine Science

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Nonlinear and linearised analyses of a generic rotor on single-pad foil-air bearings using Galerkin Reduction with different applied air film conditions

Cited by 14 publications

References 25 publications

Thermal Characterization of a Gas Foil Bearing—A Novel Method of Experimental Identification of the Temperature Field Based on Integrated Thermocouples Measurements

Thermal Characterization of a Gas Foil Bearing—A Novel Method of Experimental Identification of the Temperature Field Based on Integrated Thermocouples Measurements

The Application of the Arbitrary-Order Galerkin Reduction Method to the Dynamic Analysis of a Rotor With a Preloaded Single-Pad Foil-Air Bearing

On the Nonlinear Dynamics of a Rigid Rotor Supported by Shimmed Conical Gas Foil Bearings

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