Total acoustic transmission between fluids using a solid material with emphasis on the air–water interface
Proceedings of the Royal Society A Mathematical Physical and Engineering Sciences,
Год журнала:
2025,
Номер
481(2307)
Опубликована: Фев. 1, 2025
Total
acoustic
transmission
between
water
and
air
is
modelled
using
a
purely
solid
interface
comprising
two
elastic
plates
separated
by
periodically
spaced
ribs.
The
frequency
of
full
depends
only
on,
inversely
proportional
to,
the
areal
density
plate
facing
air.
total
also
requires
specific
dependence
rib
spacing
on
bending
stiffness
plates.
These
relations
are
result
an
explicit
analytical
solution
for
transmitted
reflected
waves
combined
with
asymptotic
approximations
based
small
parameter
defined
air-to-water
impedance
ratio.
Surprisingly,
effect
almost
independent
angle
incidence,
even
though
conditions
predicated
normal
incidence.
Parametric
studies
performed
to
examine
bandwidth
Q-factor
transmissivity.
A
lower
bound
30.6
simply
related
water–air
Язык: Английский
A broadband solid impedance transformer for acoustic transmission between water and air
Journal of Sound and Vibration,
Год журнала:
2025,
Номер
unknown, С. 119120 - 119120
Опубликована: Апрель 1, 2025
Язык: Английский
Transmedia transmission enhancement based on transformation acoustics
Physical review. B./Physical review. B,
Год журнала:
2024,
Номер
110(21)
Опубликована: Дек. 2, 2024
Transmission
enhancement
of
sound
waves
across
the
interface
between
media
with
different
impedances
is
a
classical
problem
in
acoustic
communication,
for
instance
case
water-air
interface.
Different
strategies,
including
bubble-embedded
metasurfaces
or
impedance-matched
metamaterials,
have
been
developed
to
render
transparent.
Transmedia
wave
up
now
either
broadband
incorporating
customized
wavefront
manipulation.
In
this
paper,
we
explore
use
transformation
acoustics
and
gauge
realize
both
goals
simultaneously.
Transformation
first
argued
provide
lossless
transmedia
enhancement,
although
at
expense
adapting
cross
section
respect
power-flow
conservation.
It
specifically
proven
that
gradient
anisotropic
metamaterial
provides
perfect
transmission
two
dimensions
steering
allowed
as
well.
Gauge
theory
then
adapted
from
elasticity
one-dimensional
via
Willis-like
metamaterial.
Finally,
transformations
are
combined
together
implement
focusing
The
lens
designed
by
proposed
method
achromatic.
This
paper
expected
alternative
solutions
communication.
Язык: Английский
Prediction of Sound Transmission Loss of Simple Expansion Chamber with the Application of FEA Tool
International Journal of Advanced Research in Science Communication and Technology,
Год журнала:
2024,
Номер
unknown, С. 239 - 244
Опубликована: Май 29, 2024
A
muffler
reduces
the
noise
from
an
exhaust
system.
reactive
achieves
reduction
by
reflecting
sound
waves
back
towards
source.
Transmission
loss
is
commonly
used
to
quantify
its
effectiveness,
comparing
transmitted
pressure
level
incident
level.
Mufflers
are
typically
arranged
along
pipe
as
part
of
system
internal
combustion
engine
reduce
noise.
Simple
expansion
chambers
with
extended
inlet
and
outlet
pipes
in
mufflers.
Important
data
can
be
obtained
for
various
analysing
these
configurations.
The
results
show
transmission
characteristics
simple
based
on
Finite
Element
Analysis
(FEA)
Язык: Английский
SURF: Eavesdropping on Underwater Communications from the Air
Proceedings of the 28th Annual International Conference on Mobile Computing And Networking,
Год журнала:
2024,
Номер
unknown, С. 815 - 829
Опубликована: Дек. 4, 2024
This
paper
investigates
how
an
airborne
node
can
eavesdrop
on
the
underwater
acoustic
communication
between
submerged
nodes.
Conventionally,
such
eavesdropping
has
been
assumed
impossible
as
signals
do
not
cross
water-air
boundary.
Here,
we
demonstrate
that
communications
be
picked
up
and
(under
certain
conditions)
decoded
using
mmWave
radar
due
to
minute
vibrations
induced
by
water
surface.
We
implemented
evaluated
a
proof-of-concept
prototype
of
our
method
tested
it
in
controlled
(pool)
uncontrolled
environments
(lake).
Our
results
device
identify
modulation
bitrate
transmissions
from
uncooperative
transmitter
(victim),
even
decode
transmitted
symbols.
Unlike
conventional
over-the-air
communications,
indicate
secrecy
links
varies
depending
type
provide
insights
into
underlying
reasons
behind
these
differences.
also
highlight
theoretical
limitations
threat
model,
may
have
significant
impact
stealthiness
with
particular
concern
submarine
warfare,
operations
(e.g.,
oil
&
gas,
search
rescue,
mining),
conservation
endangered
species.
Finally,
investigation
uncovers
countermeasures
used
improve
or
restore
against
threats.
Язык: Английский
Adjustable phase-amplitude-phase acoustic metasurface for the implementation of arbitrary impedance matrices
Research,
Год журнала:
2024,
Номер
7
Опубликована: Янв. 1, 2024
Impedance
metasurfaces
enable
accurate
regulation
of
acoustic
fields.
However,
they
can
hardly
supply
a
flexible
response
as
such
perfect
operation
is
accompanied
by
stringent
requirements
on
the
design
unit
cells.
Actually,
an
arbitrary
lossless
and
passive
target
impedance
matrix
requires
tuning
3
independent
real
parameters.
The
set
composed
reflection
phase,
transmission
amplitude,
enables
representation
matrix,
possibly
possessing
singular
elements.
In
this
paper,
mechanism
phase-amplitude-phase
modulation
(PAP
modulation)
developed
for
generic
cells
metasurfaces.
Adjustable
are
further
available
under
framework.
An
with
mobile
parts
designed
based
idea.
assembled
metasurface
handle
different
incidences
field
manipulation
at
given
frequency.
Beam
steering
beam
splitting
considered
demonstration
examples
verified
numerical
simulation
experiment.
PAP
enriches
extends
range
application
theory.
Язык: Английский