A parametric study into the effect of variability in clearance shape and bump foil stiffness distribution in foil-air bearings

Ibrahim Ghalayini; Philip Bonello

doi:10.1201/9781003132639

A parametric study into the effect of variability in clearance shape and bump foil stiffness distribution in foil-air bearings

Ibrahim Ghalayini, Philip Bonello

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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Abstract

The linearised force coefficients method (LFCM) has traditionally been used to study the stability and compute the Campbell diagrams of rotor/foil-air bearing (FAB) systems, despite reported disagreement with low-amplitude dynamics of the nonlinear system. In this paper, a new approach for extracting the Campbell diagram from the Jacobian matrix of the nonlinear state-space model that simultaneously couples the rotor, air film and foil structure domains is used for the first time in a parametric study into the effect of variability in clearance shape and bump foil stiffness distribution in foil-air bearings. The results provide guidelines for improved foil-air bearing design that raises the onset of instability speed.

Original language	English
Title of host publication	VIRM 12: Vibrations in Rotating Machinery conference
ISBN (Electronic)	9781003132639
DOIs	https://doi.org/10.1201/9781003132639
Publication status	Published - 22 Oct 2020
Event	Vibrations in Rotating Machinery conference - Online Duration: 14 Oct 2020 → 15 Oct 2020

Conference

Conference	Vibrations in Rotating Machinery conference
Abbreviated title	VIRM 12
City	Online
Period	14/10/20 → 15/10/20

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10.1201/9781003132639

VIRM12_Final_Submission_IbrahimAccepted author manuscript, 1.77 MB

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title = "A parametric study into the effect of variability in clearance shape and bump foil stiffness distribution in foil-air bearings",

abstract = "The linearised force coefficients method (LFCM) has traditionally been used to study the stability and compute the Campbell diagrams of rotor/foil-air bearing (FAB) systems, despite reported disagreement with low-amplitude dynamics of the nonlinear system. In this paper, a new approach for extracting the Campbell diagram from the Jacobian matrix of the nonlinear state-space model that simultaneously couples the rotor, air film and foil structure domains is used for the first time in a parametric study into the effect of variability in clearance shape and bump foil stiffness distribution in foil-air bearings. The results provide guidelines for improved foil-air bearing design that raises the onset of instability speed.",

author = "Ibrahim Ghalayini and Philip Bonello",

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month = oct,

day = "22",

doi = "10.1201/9781003132639",

language = "English",

booktitle = "VIRM 12: Vibrations in Rotating Machinery conference",

note = "Vibrations in Rotating Machinery conference , VIRM 12 ; Conference date: 14-10-2020 Through 15-10-2020",

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T1 - A parametric study into the effect of variability in clearance shape and bump foil stiffness distribution in foil-air bearings

AU - Ghalayini, Ibrahim

AU - Bonello, Philip

PY - 2020/10/22

Y1 - 2020/10/22

N2 - The linearised force coefficients method (LFCM) has traditionally been used to study the stability and compute the Campbell diagrams of rotor/foil-air bearing (FAB) systems, despite reported disagreement with low-amplitude dynamics of the nonlinear system. In this paper, a new approach for extracting the Campbell diagram from the Jacobian matrix of the nonlinear state-space model that simultaneously couples the rotor, air film and foil structure domains is used for the first time in a parametric study into the effect of variability in clearance shape and bump foil stiffness distribution in foil-air bearings. The results provide guidelines for improved foil-air bearing design that raises the onset of instability speed.

AB - The linearised force coefficients method (LFCM) has traditionally been used to study the stability and compute the Campbell diagrams of rotor/foil-air bearing (FAB) systems, despite reported disagreement with low-amplitude dynamics of the nonlinear system. In this paper, a new approach for extracting the Campbell diagram from the Jacobian matrix of the nonlinear state-space model that simultaneously couples the rotor, air film and foil structure domains is used for the first time in a parametric study into the effect of variability in clearance shape and bump foil stiffness distribution in foil-air bearings. The results provide guidelines for improved foil-air bearing design that raises the onset of instability speed.

UR - https://doi.org/10.1201/9781003132639

U2 - 10.1201/9781003132639

DO - 10.1201/9781003132639

M3 - Conference contribution

BT - VIRM 12: Vibrations in Rotating Machinery conference

T2 - Vibrations in Rotating Machinery conference

Y2 - 14 October 2020 through 15 October 2020

ER -

A parametric study into the effect of variability in clearance shape and bump foil stiffness distribution in foil-air bearings

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