Processes,
Год журнала:
2024,
Номер
12(11), С. 2446 - 2446
Опубликована: Ноя. 5, 2024
As
a
type
of
locally
resonant
phononic
crystal,
alloy
steel
crystals
have
achieved
notable
advancements
in
vibration
and
noise
reduction,
particularly
the
realm
low-frequency
noise.
Their
exceptional
band
gap
characteristics
enable
efficient
reduction
at
low
frequencies.
However,
conventional
transmission
loss
(TL)
simulation
finite
structures
remains
benchmark
for
plate
structure
TL
experiments.
In
this
context,
XY-direction
crystal
has
been
thoroughly
investigated
analyzed.
Given
complexity
sound
wave
incident
directions
practical
applications,
often
diverges
from
reality.
Taking
tungsten
as
an
example,
paper
introduces
novel
element
method
(FEM)
approach
analyzing
plates.
By
setting
Z-direction
excitation
source,
exhibits
distinct
responses
compared
to
XY-direction.
combining
energy
diagrams
modes,
impact
various
source
on
simulations
is
It
observed
that
more
pronounced
response
under
longitudinal
excitation.
The
map
excited
lacks
flat
region
present
map.
Notably,
maximum
131.5
dB,
which
significantly
lower
than
298
dB
XY-direction,
with
regular
peak
distribution.
This
indicates
closely
related
acoustic
propagation
within
plate,
whereas
aligns
insulation
engineering
applications.
Therefore,
future
research
plates
should
not
be
confined
Further
investigation
analysis
are
necessary.
will
provide
theoretical
foundation
methodological
guidance
crystals,
enhancing
completeness
systematicness
studies
Simultaneously,
it
advance
application
International Journal of Thermofluids,
Год журнала:
2024,
Номер
22, С. 100611 - 100611
Опубликована: Фев. 16, 2024
Due
to
their
improved
mechanical
properties
and
adaptability,
microplates
with
tailored
variable
thickness
profiles
are
becoming
essential
parts
of
advanced
micro-
nanoelectromechanical
systems
(MEMS
NEMS).
This
study
conducts
a
thorough
analytical
analysis
the
vibration
thermally
loaded,
multilayer
functionally
graded
graphene
platelet-reinforced
composite
(FG-GPLRC)
linearly
or
parabolically
varying
resting
on
viscoelastic
medium
under
different
boundary
conditions.
The
Halpin-Tsai
micromechanical
model
law
mixtures
employed
calculate
effective
material
characteristics
for
various
reinforcement
distributions
in
microplate.
These
encompass
uniformly
symmetric
asymmetric
arrangements.
utilized
first-order
shear
deformation
theory
(FSDT)
conjunction
modified
strain
gradient
(MSGT)
Hamilton's
principle
generate
dynamic
governing
equations
structure,
accounting
size-dependent
effects.
resulting
afterwards
solved
using
utilization
Galerkin
technique.
enables
evaluation
proposed
solution's
correctness
precision.
impact
factors
behavior
is
investigated
through
numerical
analysis.
length
scale
parameters,
temperature
fluctuations,
distribution
profiles,
conditions,
pattern
GPL,
taper
constants
both
unidirectional
bidirectional
scenarios,
weight
fraction
GPL.
International Journal of Thermofluids,
Год журнала:
2023,
Номер
20, С. 100408 - 100408
Опубликована: Июнь 27, 2023
The
present
study
investigates
the
wave
propagation
characteristics
of
porous,
multi-directional,
functionally
graded
(FG)
nanoplates
embedded
in
a
Kerr-elastic
substrate.
A
first-order
shear
deformation
model
(FSDM)
and
nonlocal
strain
gradient
approach
(NSGA)
are
utilized
to
address
this
issue.
NSGA
is
enhanced
by
considering
softening
hardening
material
effects,
leading
improved
accuracy
obtained
results.
In
accordance
with
law
mixing,
properties
exhibit
nonlinear
temperature-dependent
variations
along
structural
axes.
Both
even
uneven
porosity
profiles
considered
study.
nonclassical
governing
equations
for
proposed
structure
derived
using
Hamilton's
approach.
phase
velocity
frequency
determined
through
analytical
solution
an
eigenvalue
problem,
which
depends
on
number.
dispersion
waves
porous
FG
examined
respect
various
factors,
including
distributions,
numbers,
elastic
foundation
coefficients,
volume
fraction
index.
main
findings
indicate
that
increasing
index
thickness
direction
leads
decrease
nanoplate
given
Additionally,
regardless
pattern,
increase
coefficient
results
velocity.
Engineered Science,
Год журнала:
2023,
Номер
unknown
Опубликована: Янв. 1, 2023
In
the
present
study,
free
and
forced
vibration
analysis
of
sandwich
smart
magneto-electro-elastic
(MEE)
nanoplates
with
functionally
graded
material
porous
(FGMP)
linearly
or
parabolically
varying
thickness
core
layer
under
initial
external
electric
magnetic
potentials
is
studied
using
first-order
shear
deformation
theory
(FSDT)
nonlocal
strain
gradient
(NSGT).NSGT
perfected
softening
hardening
effects,
which
can
significantly
improve
precision
results.Three
states
porosity
distribution
patterns,
i.e.,
even,
uneven,
logarithmic-uneven
distributions
are
considered
for
FGMP
layer,
supposed
to
vary
along
in-plane
directions.The
related
governing
equations
obtained
in
time
domain
by
applying
Hamilton's
principle.The
established
solution
examined
terms
its
via
a
comparison
other
available
data.Studies
parameters
show
effects
unidirectional
bidirectional
taper
constants,
potentials,
distributions,
FG
index,
characteristics
on
vibration.
Materials,
Год журнала:
2023,
Номер
16(6), С. 2467 - 2467
Опубликована: Март 20, 2023
Locally
resonant
phononic
crystals
are
a
kind
of
artificial
periodic
composite
material/structure
with
an
elastic
wave
band
gap
that
show
attractive
application
potential
in
low-frequency
vibration
control.
For
control
problems
ship
power
systems,
this
paper
proposes
crystal
board
structure,
and
based
on
the
Bloch
theorem
it
uses
finite
element
method
to
calculate
structure
displacement
fields
corresponding
characteristic
mode
transmission
curve
sandwich
plate
characteristics
studied.
The
mechanism
formation
is
mainly
attributed
coupling
structure.
Numerical
results
has
double
periodicity,
so
multi-stage
gap,
which
can
fully
inhibit
flexural
waves
isolate
vibration.
experimental
measurements
spectra
were
conducted
validate
accuracy
reliability
numerical
calculation
method.
On
basis,
proposed
isolation
marine
system
discussed.
A
platform
mounted
steel
studied
by
simulation,
protect
electronic
equipment
precision
instruments.
International Journal of Thermofluids,
Год журнала:
2023,
Номер
20, С. 100409 - 100409
Опубликована: Июнь 28, 2023
This
study
presents
an
analytical
framework
based
on
the
third-order
shear
deformation
theory
(TSDT)
to
conduct
a
comprehensive
thermo-vibro-acoustic
evaluation
of
multi-layered
asphalt
system
subjected
harmonically
rectangular
moving
load.
The
research
aims
investigate
dynamic
response
and
sound
radiation
characteristics
pavement
under
various
operating
conditions.
materials
methods
employed
in
this
are
as
follows:
temperature
variations
along
thickness
axis
layers
considered,
Hamilton's
principle
is
adopted
derive
governing
equations
time-based
domain.
then
solved
Laplace
domain
using
Fourier
series
transform.
acoustic
pressure
generated
by
load
investigated
applying
Durbin's
numerical
transform
inversion
technique
analyzing
Rayleigh
integral.
accuracy
flexibility
proposed
approach
demonstrated
through
comparisons
with
previous
studies
finite
element
(FE)
simulations
COMSOL
Multiphysics®.
Finally,
analysis
conducted
examine
impact
factors,
including
frequency
velocity
excitation
load,
viscoelastic
medium,
temperature,
both
pavement.
Some
major
findings
An
increase
leads
higher
waves
closer
spacing
between
them,
resulting
elevated
amplitude.
Higher
temperatures
cause
increased
softness
rutting
depth
loads.
offers
novel
practical
contribution
field
systems
presenting
for
providing
valuable
insights
into
