Frequency-Domain Estimation of Linearized Oil-Film Coefficients

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Abstract
A frequency domain algorithm for estimating linearized oil-film bearing coefficients is developed and evaluated under controlled conditions. Its ability to produce meaningful coefficient estimates from noisy data is examined, and a confidence bound is provided for the estimates. Results obtained from both simulated and experimental data show that the technique is more efficient than the time-domain algorithm described in earlier work. A comparison of experimentally estimated and theoretically derived coefficients for a squeeze-film bearing suggests that closed-form expressions for the velocity coefficient obtained by assuming a 180 deg oil-film are valid for a wider range of eccentricity ratios than have been previously demonstrated.

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