Micromachines,
Journal Year:
2024,
Volume and Issue:
15(10), P. 1216 - 1216
Published: Sept. 29, 2024
Hard-brittle
materials
are
widely
used
in
the
optics,
electronics,
and
aviation
industries,
but
their
high
hardness
brittleness
make
it
challenging
for
traditional
processing
methods
to
achieve
efficiency
superior
surface
quality.
This
study
aims
investigate
application
of
ultrasonic
local
resonant
grinding
sapphire
improve
meet
requirements
optical
window
roughness
material.
The
frequency
a
piezoelectric
vibration
system
amplitude
head's
working
face
were
simulated
tested,
respectively.
results
experiments
showed
that
reduced
parameter
(Ra)
14
nm
improved
its
flatness
44.2
nm,
thus
meeting
ultra-precision
sapphire.
Compared
with
conventional
system,
ground
was
by
90.79%,
81.58%,
material
removal
rate
increased
31.35%.
These
experimental
has
better
effects
than
those
improving
quality
increasing
rate.
Physics of Fluids,
Journal Year:
2025,
Volume and Issue:
37(2)
Published: Feb. 1, 2025
The
traditional
water-lubricated
bearings
are
unable
to
respond
the
large
impact,
severe
wear
and
abnormal
vibration
of
rotating
shaft
system
under
extreme
working
conditions.
paper
studies
lubrication
behaviors
supporting
effects
a
new
bearing.
tribo-dynamic
bearing-shaft
investigated.
New
coupling
model
different
regimes
is
constructed.
variation
rules
typical
conditions
parameters
analyzed.
dynamic
performances
in
mixed
hydrodynamic
stages
compared.
mechanisms
revealed.
results
indicate
that
components
characteristics
bearing
differ
corresponding
stages.
Research
provides
theoretical
basis
experimental
guidance
for
practical
application
novel
multi-liner
marine
bearings.
Lubricants,
Journal Year:
2024,
Volume and Issue:
12(4), P. 107 - 107
Published: March 24, 2024
Contrary
to
conventional
journal
bearings,
which
operate
using
oil-based
substances,
water-lubricated
bearings
(WLBs)
utilize
water
and,
thus,
constitute
a
more
environmentally
responsible
solution.
The
shipping
industry,
among
others,
as
already
been
introduced
this
technology
with
lot
of
commercial
ships
stern
tube
systems;
in
other
cases,
hydropower
plants
manage
keep
up
the
strict
environmental
regulations
by
implementing
use
WLBs
turbines.
However,
there
are
challenges
when
it
comes
transitioning
from
water-based
ones.
Such
caused
low
viscosity
and
lead
phenomena
high
complexity.
related
but
not
limited
cavitation
turbulent
flow
due
interaction
between
lubricating
bearing
surface.
In
study,
numerical
method
will
be
used
simulate
fluid
film
geometries
order
perform
thermo-elastohydrodynamic
(TEHD)
analysis.
dynamic
characteristics
calculated
results
discussed.
novelty
study
is
evident
determination
elastic
deformation
WLB
during
operation,
well
effect
surface
roughness,
cavitation,
thermal
effects
on
characteristics.
