Nature Communications,
Год журнала:
2024,
Номер
15(1)
Опубликована: Окт. 31, 2024
Mitigating
broadband
noise
with
passive
airborne
sound
absorbers
has
been
a
long-lasting
challenge,
particularly
for
low-frequency
anthropogenic
sounds
below
kilohertz
long
wavelengths,
which
require
bulky
materials
effective
absorption.
Here,
we
propose
strategy
that
utilizes
local
triboelectric
effect
and
in-situ
electrical
energy
dissipation
mechanism
This
approach
involves
fundamentally
different
converts
into
electricity
dissipation,
in
contrast
to
conventional
mechano-thermal
conversion
mechanisms.
We
establish
an
equivalent
acoustic
impedance
model
provide
theoretical
analysis
of
the
underlying
absorption
mechanisms,
maximum
mechano-electro-thermal
coupling
efficiency
approaching
100%
under
optimal
conditions.
design
fibrous
composite
foam
accordingly
show
their
substantially
boosted
performance
experimentally,
where
adoption
diverse
material
pairs
validates
larger
difference
charge
affinities
intensifies
results
higher
absorbing
performance.
A
by
utilizing
mechanisms
is
proposed
demonstrated
composites
comprising
paired
large
affinity
difference.
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
Materials
and
devices
that
harvest
acoustic
energy
can
enable
autonomous
powering
of
microdevices
wireless
sensors.
However,
traditional
harvesters
rely
on
brittle
piezoceramics,
which
have
restricted
their
use
in
wearable
electronic
devices.
To
address
these
limitations,
this
study
involves
the
fabrication
using
electrospinning
piezoelectric
polymer
PVDF-TrFE
onto
fabric-based
electrodes.
Two-dimensional
(2D)
Ti
Advanced Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 15, 2024
Acoustic
sensor-based
human-machine
interaction
(HMI)
plays
a
crucial
role
in
natural
and
efficient
communication
intelligent
robots.
However,
accurately
identifying
tracking
omnidirectional
sound
sources,
especially
noisy
environments
still
remains
notable
challenge.
Here,
self-powered
triboelectric
stereo
acoustic
sensor
(SAS)
with
recognition
capabilities
by
3D
structure
configuration
is
presented.
The
SAS
incorporates
porous
vibrating
film
high
electron
affinity
low
Young's
modulus,
resulting
sensitivity
(3172.9
mV
Journal of Materials Chemistry A,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
2D
MXenes
and
silver
enhance
the
piezo
sensor
sensitivity
for
sound-induced
vibration.
These
flexible,
self-powered
sensors
enable
damage
detection
in
carbon
fiber
composites
structural
health
monitoring
automotive
aerospace
sectors.
Applied Mathematics and Mechanics,
Год журнала:
2024,
Номер
45(7), С. 1243 - 1260
Опубликована: Июль 1, 2024
Abstract
Locally
resonant
metamaterials
have
low-frequency
band
gaps
and
the
capability
of
converging
vibratory
energy
in
at
cells.
It
has
been
demonstrated
by
several
researchers
that
dissipatioin
within
gap
can
be
improved
using
viscoelastic
materials.
This
paper
designs
an
integrated
metamaterial
for
harvesting
vibration
isolation.
The
is
achieved
a
beam
periodically
arrayed
with
spatial
ball-pendulum
nonlinear
harvesters.
resonator
function
placing
free-rolling
magnetic
ball
spherical
cavity
additional
induction
coil.
dynamic
equations
under
transverse
excitation
are
established,
isolation
characteristics
dispersion
relation
analyzed.
results
show
vibrations
main
body
significantly
suppressed
frequency
range
local
resonance
gap.
At
same
time,
elastic
waves
limited
function,
which
improves
output.
Finally,
experimental
platform
established
validation
purposes.
