Identification of Damping Parameters of a Squeeze-Film Bearing.
Final technical rept. Oct 84-Oct 85,
SUSSEX UNIV BRIGHTON (ENGLAND)
Pagination or Media Count:
Determination of the damping and inertial coefficients of a squeeze-film bearing, and the dependence of these coefficients on eccentricity ratio and the dependence of these coefficients on eccentricity ration and frequency of vibration were studied. Experimental results were obtained from a rig in which the squeeze-film journal is mounted on a beam of continuously variable length. By means of a transient test technique, combined with signal processing based on a parametric identification method, estimates of the damping and inertial coefficients obtained for static eccentricity ratios in the range 0.0 to 0.5, and for vibration frequencies ranging from 50 Hz to 180 Hz. These coefficients are, in general, much higher in value than conventional short-bearing theory for squeeze-film bearings predicts by a factor of 10 in some cases suggesting serious inadequacies in available theoretical prediction. Numerical theoretical predictions of these coefficients were obtained for finite-length bearings, with various LD rations where L is the length of one bearing land, and D the bearing diameter.
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