Parameter Sensitivity Analysis on Dynamic Coefficients of Partial Arc Annular-Thrust Aerostatic Porous Journal Bearings

Aerostatic bearings are widely used in high-precision devices. Partial arc annular-thrust aerostatic porous journal bearings are a prominent type of aerostatic bearings, which carry both radial and axial loads and provide high load-carrying capacity, low air consumption, and relatively low cost. Spi...

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Autores principales:	Pyung Hwang, Polina Khan, Seok-Won Kang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	aerostatic journal bearings porous bearing annular-thrust bearing numerical simulation finite element method dynamic coefficients Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/151329f56bca47889720bc6833e31ac7
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id	oai:doaj.org-article:151329f56bca47889720bc6833e31ac7
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spelling	oai:doaj.org-article:151329f56bca47889720bc6833e31ac72021-11-25T16:38:11ZParameter Sensitivity Analysis on Dynamic Coefficients of Partial Arc Annular-Thrust Aerostatic Porous Journal Bearings10.3390/app1122107912076-3417https://doaj.org/article/151329f56bca47889720bc6833e31ac72021-11-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/22/10791https://doaj.org/toc/2076-3417Aerostatic bearings are widely used in high-precision devices. Partial arc annular-thrust aerostatic porous journal bearings are a prominent type of aerostatic bearings, which carry both radial and axial loads and provide high load-carrying capacity, low air consumption, and relatively low cost. Spindle shaft tilting is a resource-demanding challenge in numerical modeling because it involves a 3D air flow. In this study, the air flow problem was solved using a COMSOL software, and the dynamic coefficients for tilting degrees of freedom were obtained using finite differences. The obtained results exhibit significant coupling between the tilting motion in the x-and y-directions: cross-coupled coefficients can achieve 20% of the direct coefficient for stiffness and 50% for damping. In addition, a nonlinear behavior can be expected, because the tilting motion within 3°, tilting velocities within 0.0012°/s, and relative eccentricity of 0.2 have effects as large as 20% for direct stiffness and 100% for cross-coupled stiffness and damping. All dynamic coefficients were fitted with a polynomial of eccentricity, tilting, and tilting velocities in two directions, with a total of six parameters. The resulting fitting coefficient tables can be employed for the fast dynamic simulation of the rotor shaft carried on the proposed bearing type.Pyung HwangPolina KhanSeok-Won KangMDPI AGarticleaerostatic journal bearingsporous bearingannular-thrust bearingnumerical simulationfinite element methoddynamic coefficientsTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 10791, p 10791 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	aerostatic journal bearings porous bearing annular-thrust bearing numerical simulation finite element method dynamic coefficients Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	aerostatic journal bearings porous bearing annular-thrust bearing numerical simulation finite element method dynamic coefficients Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Pyung Hwang Polina Khan Seok-Won Kang Parameter Sensitivity Analysis on Dynamic Coefficients of Partial Arc Annular-Thrust Aerostatic Porous Journal Bearings
description	Aerostatic bearings are widely used in high-precision devices. Partial arc annular-thrust aerostatic porous journal bearings are a prominent type of aerostatic bearings, which carry both radial and axial loads and provide high load-carrying capacity, low air consumption, and relatively low cost. Spindle shaft tilting is a resource-demanding challenge in numerical modeling because it involves a 3D air flow. In this study, the air flow problem was solved using a COMSOL software, and the dynamic coefficients for tilting degrees of freedom were obtained using finite differences. The obtained results exhibit significant coupling between the tilting motion in the x-and y-directions: cross-coupled coefficients can achieve 20% of the direct coefficient for stiffness and 50% for damping. In addition, a nonlinear behavior can be expected, because the tilting motion within 3°, tilting velocities within 0.0012°/s, and relative eccentricity of 0.2 have effects as large as 20% for direct stiffness and 100% for cross-coupled stiffness and damping. All dynamic coefficients were fitted with a polynomial of eccentricity, tilting, and tilting velocities in two directions, with a total of six parameters. The resulting fitting coefficient tables can be employed for the fast dynamic simulation of the rotor shaft carried on the proposed bearing type.
format	article
author	Pyung Hwang Polina Khan Seok-Won Kang
author_facet	Pyung Hwang Polina Khan Seok-Won Kang
author_sort	Pyung Hwang
title	Parameter Sensitivity Analysis on Dynamic Coefficients of Partial Arc Annular-Thrust Aerostatic Porous Journal Bearings
title_short	Parameter Sensitivity Analysis on Dynamic Coefficients of Partial Arc Annular-Thrust Aerostatic Porous Journal Bearings
title_full	Parameter Sensitivity Analysis on Dynamic Coefficients of Partial Arc Annular-Thrust Aerostatic Porous Journal Bearings
title_fullStr	Parameter Sensitivity Analysis on Dynamic Coefficients of Partial Arc Annular-Thrust Aerostatic Porous Journal Bearings
title_full_unstemmed	Parameter Sensitivity Analysis on Dynamic Coefficients of Partial Arc Annular-Thrust Aerostatic Porous Journal Bearings
title_sort	parameter sensitivity analysis on dynamic coefficients of partial arc annular-thrust aerostatic porous journal bearings
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/151329f56bca47889720bc6833e31ac7
work_keys_str_mv	AT pyunghwang parametersensitivityanalysisondynamiccoefficientsofpartialarcannularthrustaerostaticporousjournalbearings AT polinakhan parametersensitivityanalysisondynamiccoefficientsofpartialarcannularthrustaerostaticporousjournalbearings AT seokwonkang parametersensitivityanalysisondynamiccoefficientsofpartialarcannularthrustaerostaticporousjournalbearings
_version_	1718413062618218496

Parameter Sensitivity Analysis on Dynamic Coefficients of Partial Arc Annular-Thrust Aerostatic Porous Journal Bearings

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