Proceedings of the Institution of Mechanical Engineers Part J Journal of Engineering Tribology,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 4, 2024
This
study
endeavors
to
establish
a
transient
mixed
lubrication
model
for
time-varying
wear
of
main
bearings
under
dynamic
loading
conditions
during
the
startup
process.
accounts
variations
in
oil
film
thickness
attributable
deformation,
profiles,
and
journal
misalignment
throughout
operational
cycle.
The
evolution
bearing
characteristics
process
was
analyzed,
as
well
profiles
their
effects
on
lubricating
properties
different
numbers
startups.
results
indicate
that
number
cycles
increases,
rate
gradually
levels
off.
With
increasing
times,
there
is
decrease
contact
pressure
slight
reduction
pressure,
resulting
enhanced
performance.
Furthermore,
influence
duration
significantly
greater
than
radial
clearance.
Sustainability,
Journal Year:
2024,
Volume and Issue:
16(17), P. 7544 - 7544
Published: Aug. 30, 2024
In
the
context
of
green
building
and
sustainable
urban
development,
understanding
mechanical
behavior
structural
components
like
concrete-filled
steel
tube
(CFST)
columns
is
crucial
due
to
their
improved
load-bearing
capacity,
energy
efficiency,
optimized
material
usage,
which
enhance
resilience
sustainability.
This
research
addresses
complex
development
confining
stress
its
impact
on
concrete
core
(CC)
within
these
columns,
are
essential
for
infrastructure.
Through
extensive
numerical
studies,
this
study
proposes
a
model
estimate
in
axially
loaded
CFST
short
columns.
Study
findings
reveal
that
confinement
effectiveness
influenced
by
variables
such
as
compressive
strength
(CS)
concrete,
cross-sectional
shape,
depth-to-wall
thickness
percentage.
Additionally,
also
significantly
affected
yield
strain
εy/εc
peak
unconfined
εc.
A
three-dimensional
finite
element
(FEM)
was
built
simulation
columns’
nonlinear
rigorously
validated
against
experimental
data.
aids
design
implementation
more
efficient
resilient
structures,
supporting
principles
construction.
The
underscores
importance
integrity
provides
valuable
insights
improving
materials.
Scientific Reports,
Journal Year:
2025,
Volume and Issue:
15(1)
Published: March 24, 2025
Among
the
many
methods
and
techniques
for
optimizing
soil-cultivating
unit
parameters,
method
of
Lagrange
multipliers
occupies
a
special
place.
In
this
article,
is
used
to
develop
analytical
dependencies
that
make
it
possible
determine
optimal
values
of
operating
width
speed
tillage
(ploughing
cultivating)
units
at
set
value
tractor
engine
power
linear
nature
dependence
its
slipping
on
traction
force.
As
result,
was
found
decreasing
intensity
in
ploughing
(
$$\:B$$
)
with
an
increase
plough's
specific
resistance
coefficient
$$\:{K}_{s}$$
practically
independent
depth
$$\:h$$
).
When
changing
parameter
range
0.22–0.30
m,
increasing
from
50
65
kN
m−
2
requires
reducing
by
23%.
The
maximum
performance
plough
occurs
minimum
,
$$\:V$$
parameters.
This
result
achieved
width.
At
same
time,
cultivator
(3.6
1)
(3.0
m
s−
parameters
amounts
8.6
ha
h−
1.
Compared
option
(2.0
28.4%
more.
