Title:
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High-speed performance of a hydrostatic thrust bearing.
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The programme of research reported in this dissertation
was undertaken with the aim of improving the high-speed
performance of a multi-recessed hydrostatic thrust
bearing. A theoretical analysis of the quasi-static
behaviour and isothermal frictional power consumption
is developed using the basic equations governing
viscous fluid flow. The effects of high peripheral
speeds are discussed and how recently proposed bearing
modifications, in the form of grooved lands and changes
in recess geometry, are used to reduce the frictional
power consumption, lower operating temperatures, and
reduce unwanted hydrodynamic and fluid inertia induced
pressure variations. The steady state temperature
distribution, frictional power consumption and
operating clearance when one bearing member is
rotating, and dynamic loading performance are predicted
by several specially developed Fortran computer
programs.
One section concentrates on the design, development and
instrumentation of an experimental multi-recessed
hydrostatic thrust bearing, which had a facility for
changing the pocket geometry using recess inserts. The
bearing plate. which had an outside diameter of 200 mm,
was operated at rotational speeds between 1000-5000 rpm
to give peripheral speeds between 10.5 - 52.5 m/s. A
chapter deals with an experimental investigation of the
high-speed performance of a multi-recessed hydrostatic
thrust bearing, principally the quasi-static loading
and flow rate characteristics, temperature and pressure
distributions and frictional power consumption.
Furthermore, the dynamic response of the test bearing
arrangement was investigated experimentally for a range
of excitation frequencies between 0- 70 Hz-
Finally, the theoretical predictions of characteristics
such as quasi-static loading and flow rate, steady
state operating conditions and dynamic response are
compared with the corresponding experimental results.
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