Auxiliary Bearing Life Prediction Using Hertzian Contact Bearing Model

[+] Author and Article Information
Guangyoung Sun

 NASA John H. Glenn Research Center at Lewis Field, 21000 Brookpark Rd, MS 301-5, Cleveland, OH 44135guangdol@hotmail.com

J. Vib. Acoust 128(2), 203-209 (Sep 09, 2005) (7 pages) doi:10.1115/1.2159036 History: Received December 12, 2004; Revised September 09, 2005

A rotating machine with active magnetic bearings (AMBs) requires conventional bearings as a backup support system in the case of AMB failure. This paper presents an estimated auxiliary/catcher bearing (CB) L10 fatigue life based on the Hertzian contact dynamic loads between bearing ball and races during the touchdown. The thermal growths of bearing components are predicted using a one-dimensional thermal model, and the resulting expansions contribute to the calculation for the Hertzian contact loads. Numerical simulations for an energy-storage flywheel module reveal that a high-speed backward whirl significantly reduces the CB life and that an optimal damping lowers the CB temperature and increases the CB life.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Cross-sectioned ball bearing with groove centers p,q

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Figure 2

(a) Bearing reference coordinate and (b) inner-race groove reference center

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Figure 3

Displacements of ball, inner, and outer races

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Figure 4

Cross-sectioned bearing with thermal nodes

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Figure 5

Energy storage flywheel with magnetic suspensions

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Figure 6

Auxiliary support system

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Figure 7

Nondimensional (a) peak rotor/CB normal contact force and (b) minimum air gap versus μd: nominal fpeak=997N, nominal air gap=0.254mm

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Figure 8

(a) CB life in hour and (b) maximum ball stress versus μd

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Figure 9

Thermal growths versus μd (엯, case I; ◻, case III): (a) TLe, (b) Ti, (c) Tb, and (d) Te

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Figure 10

Nondimensional (a) peak rotor/CB contact force and (b) minimum air gap versus oil viscosity: nominal fpeak=997N, nominal air gap=0.254mm

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Figure 11

(a) CB life in hour and (b) ball stress versus oil viscosity

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Figure 12

Thermal growths versus oil viscosity: (a) TLe, (b) Ti, (c) Tb, and (d) Te



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