In this paper the authors address the problem of parameter estimation in linearized models of squeeze-film dampers. After demonstrating how the choice of an unsuitable model structure can lead to the misinterpretation of experimentally derived coefficients, a technique is described for assessing the significance of individual inertia, damping and stiffness effects associated with the squeeze-film. An experimental study involving a squeeze-film vibration isolator is described. It is shown how the technique allows the model structure to be simplified in a systematic way.
Get full access to this article
View all access options for this article.
References
1.
EykhoffP.System identification: state and parameter estimation, 1974 (Wiley-Interscience, London).
2.
EllisJ.RobertsJ. B.RamliM. D.The experimental determination of squeeze-film dynamic coefficients using the state variable filter method of parametric identification. Trans. ASME, J. Tribology, 1989, 111, 252–259.
3.
DowsonD.TaylorC. M.The state of knowledge in the field of bearing-influenced rotor dynamics. Tribology Int., 1980, 13, 176–178.
4.
MortonP. G.The derivation of bearing characteristics by means of transient excitation applied directly to a rotating shaft. GEC J. Sci. Technol., 1975, 42, 37–47.
5.
FiroozianR.StanwayR.Modelling and control of turbo-machinery vibrations. Trans. ASME, J. Vibr., Acoustics, Stress and Reliability in Des., 1988, 110, 521–527.
6.
BoxG. E. P.JenkinsG. M.Time-series analysis, forecasting and control, 1976 (Holden Day, San Francisco).
7.
StanwayR.FiroozianR.MottersheadJ. E.Estimation of the linearised damping coefficients of a squeeze-film vibration isolator. Proc. Instn Mech. Engrs., Part C, 1987, 201(C3), 181–191.
8.
RobertsJ. B.HolmesR.MasonP. J.Estimation of squeeze-film damping and inertial coefficients from experimental free-decay data. Proc. Instn Mech. Engrs, Part C, 1986, 200(C2), 123–133.
9.
BurrowsC. R.StanwayR.A coherent strategy for estimating linearised oil-film coefficients. Proc. R. Soc., 1980, 370(A), 89–105.
10.
TichyJ. A.The effect of fluid inertia in squeeze-film damper bearings: a heuristic and physical description. ASME paper 83-GT-177, 1983.
11.
TichyJ. A.Measurement of squeeze-film bearing forces to demonstrate the effect of fluid inertia. ASME paper 84-GT-11, 1984.
12.
AndresSan L. A.VanceJ. M.Effects of fluid inertia and turbulence on the force coefficients for squeeze-film dampers. Trans. ASME, J. Engng for Gas Turbines and Power, 1986, 108, 332–339.
13.
BurrowsC. R.SahinkayaM. N.Frequency-domain estimation of linearised oil-film coefficients. Trans. ASME, J. Lubric. Technol., 1982, 104, 210–215.
14.
SchroederM. R.Synthesis of low peak-factor signals and binary sequences of low auto-correlation. IEEE Trans. on Information Theory, 1970, IT-16, 85–89.
15.
StanwayR.MottersheadJ. E.FiroozianR.Non-linear identification of a squeeze-film damper. Trans. ASME, J. Tribology, 1988, 110, 486–491.
16.
BurrowsC. R.SahinkayaM. N.KucukN. C.Modelling of oil-film forces in squeeze-film bearings. Trans. ASME, J. Tribology, 1986, 108, 262–269.
17.
SmithD. M.Journal bearings in turbomachinery, 1969 (Chapman and Hall, London).
18.
StanwayR.TeeT. K.MottersheadJ. E.Identification of squeeze-film bearing dynamics using a recursive, frequency-domain filter. In Machinery dynamics—applications and vibration control problems, Proceedings of ASME Twelfth Biennial Conference on Mechanical Vibration and Noise, Montreal, 1989, pp. 161–176.
