By extending a previous steady-state analysis the dynamic behaviour of multi-recess hydrostatic journal bearings was analysed and a restricted closed form solution derived for motion about the position of zero eccentricity for a bearing with four recesses. This showed that dynamic instability occurs at and above a certain shaft speed, and that the shaft then precesses at a frequency of one half of the shaft speed. An experimental investigation is described and good agreement between the predicted and measured response of a bearing with four recesses was obtained for amplitudes up to an eccentricity ratio of about 0·3.
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References
1.
RaimondiA. A.BoydJ. ‘An analysis of orifice and capillary compensated hydrostatic journal bearings’, ASME-ASLE Joint Conference on Lubrication, Baltimore, 1954 (October).
HuntJ. B.AhmedK. M. ‘Load capacity, stiffness and flow characteristics of a hydrostatically lubricated six-pocket journal bearing supporting a rotating spindle’, Tribology Conv., Proc. Instn mech. Engrs1967–68182 (Pt 3N), 53.
DaviesP. B. ‘A general analysis of multi-recess hydrostatic journal bearings’, Proc. Instn mech. Engrs1969–70184 (Pt 1).
6.
StandsfieldF. M. ‘The design of hydrostatic journal bearings’, Proc. 8th Int. M. T. D. R. Conf. 1967 (Pergamon Press).
7.
DeckerO.ShapiroW. ‘Computer aided design of hydrostatic bearings for machine tool applications’, Proc. 9th Int. M. T. D. R. Conf. 1968 (Pergamon Press).
8.
RoweW. B.O'DonoghueJ. P. ‘Design of hydrostatic bearings’, Machinery Prod. Engng1968113 (No. 2928), 1284.
9.
RoyleJ. K.HowarthR. B.CaseleyHayford A. L. ‘Applications of automatic control to pressurized oil film bearings’, Proc. Instn mech. Engrs1962176, 532.
10.
SchwarzenbachJ.GillK. F. ‘Dynamic characteristics of a hydrostatic thrust bearing’, Engineer1966 (August), 309.
11.
HuntJ. B.TorbeI. ‘Characteristics of a hydrostatic thrust bearing’, Int. J. mech. Sci.19624, 503.
12.
HuntJ. B. ‘Dynamic characteristics of a hydrostatic thrust bearing’, Lubric. and Wear Second Conv., Proc. Instn mech. Engrs1963–64178 (Pt 3N), 246.
13.
TerrillR. M. ‘The flow between two parallel circular discs, one of which is subject to a normal sinusoidal oscillation’, J. lubric. Technol., Trans. Am. Soc. mech. Engrs1969 (January), 126.
14.
YampolskiiY.PirevE. V. ‘Load-carrying capacity and stability of four-pocket hydrostatic bearings’, Énergomashinostroenie1966 (6), 13.
15.
RippelH. C.‘Multi-recess journal bearings’, Part 10 of Design of Hydrostatic Bearings, Machine Design196335 (28), 158.
16.
CowleyA.KherA. K. ‘The dynamic characteristics of a hydrostatically supported spindle bearing system’, Proc. 10th Int. M. T. D. R. Conf. 1969 (Pergamon Press).
17.
OpitzH.BöttcherR.EffenbergerW. ‘Investigation on the dynamic behaviour of hydrostatic spindle-bearing systems’, Proc. 10th Int. M. T. D. R. Conf. 1969 (Pergamon Press).
18.
PatrickJ. K.ChenN. N. S. ‘Performance of a short multi-grooved capillary compensated hydrostatic journal bearing’, Tribology Conv., Proc. Instn mech. Engrs1968–69183 (Pt 3P), 107.
19.
AndvigT. A.Private communication, University of Salford.
20.
DaviesP. B.LeonardR. ‘The stability of multirecess hydrostatic journal bearings’, J. mech. Engng Sci.197012, 150.
