Abstract:
This
study is concerned with oil lubricated, hydrodynamic
journal bearings. A test rig was developed which allowed
measurements of film
pressure, film thickness and journal surface
temperature, from the rotating journal. In addition to this it
allowed the more
commonly measured variables of
bearing
oil flow and some characteristic
bearing temperatures to be
friction,
monitored.
It has been shown that an
optimum clearance exists, which
maximizes the minimum film thickness. This
experimentally
measured
optimum has been compared with various theoretical
estimates, with varying degrees of correlation. An optimum
bearing length has been observed which minimizes the
bearing
friction. This was not
predicted by any theoretical results,
but a reason for its existence has been
suggested.
Small errors in
bearing geometry were experimentally observedâ
to
give rise to large distortions in the film pressure
A
simple theoretical model for an
infinitely long non-geometric
profiles.
bearing was constructed and
measured trends. â º
found to
support the experimentally
The
infrequently observed phenomenon of tensile stresses was .
measured in the oil film under certain
stresses, at times of the order of 100lbf/in. , have been accounted
conditåons. These tensile
for
by consideration of the
In order to
permit the
parameters it was necessary
A film thickness inductance
nature of
liquids under tension. _
measurement of
journal bearing
to
develop certain instrumentation.
transducer of low temperature and
pressure sensitivity was developed. In addition to this a pressure
transducer was constructed and its
frequency response characteristics
were evaluated in
conjunction with various entrance tubes. This
particular study highlighted the region of applicability of the '
available theoretical models for
predicting pressure transducer/
tubing response. -
