Bump Foil Damping Using a Simplified Model

[+] Author and Article Information
Erik E. Swanson

 Xdot Engineering and Analysis, 112 Woodbridge Lane, Chapel Hill, NC 27514Erik@XdotEA.com

J. Tribol 128(3), 542-550 (Mar 01, 2006) (9 pages) doi:10.1115/1.2197838 History: Received August 29, 2005; Revised March 01, 2006

Foil bearings are a key enabling technology for advanced and oil-free rotating machinery. In certain applications, they provide a level of performance that is difficult or impossible to match with other technologies. A number of reasonably successful analytical techniques to predict bearing load capacity, power loss, and stiffness have been developed. Prediction of damping, however, has remained problematic. This work presents a fresh look at the damping problem. Using a simplified representation of a bump foil, this work considers explicitly adding the load dependence of the friction force. This approach is shown to provide a good match to previous experimental data. Parametric study results for the various model parameters are presented to examine the characteristics of this model. It is concluded that the load-dependent frictional force is important to consider for a bump foil damping model.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Coulomb friction damper

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Figure 2

Coulomb friction with spring versus Fig. 6(a), Left Pivot from (25)

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Figure 3

Development of simplified bump model

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Figure 4

Simple bump model with mass

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Figure 5

Simplified bump model versus Fig. 6(a), Left Pivot from (25)

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Figure 6

Time transient and MHB responses

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Figure 7

Typical harmonic components

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Figure 8

Effect of static load

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Figure 9

Excitation amplitude results

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Figure 10

Effect of changes in friction/coupling coefficient

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Figure 11

Effect of stiffness ratio

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Figure 12

Equivalent stiffness and damping



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