Applied Physics Letters,
Год журнала:
2024,
Номер
125(25)
Опубликована: Дек. 16, 2024
Increasing
the
operable
frequency
range
and
improving
small
acceleration
amplitude
harvesting
performance
of
piezoelectric
energy
devices
is
importance
due
to
wide
spectrum
large
environmental
vibrations.
In
this
Letter,
an
improved
harvester
with
upconversion
proposed,
which
comprised
a
composite
beam
firing
pin.
contrast
conventional
impact-based
systems
that
mainly
rely
on
vibrations
enhance
performance,
proposed
system
employs
dual-impact
strategy.
particular,
oblique
phenomenon
observed,
has
not
been
investigated
in
previous
studies.
A
multilevel
impact
nonlinear
coupled
dynamic
model
developed.
The
experimental
results
indicate
at
excitation
0.15
g,
demonstrates
482.9%
increase
output
peak
value
introduces
dual-band
comparison
structure.
Additionally,
validated
through
adjustments
various
load
resistances.
highest
power
achieved
resistance
210
kΩ,
maximum
average
reaching
3.96
mW
density
1.59
mW/mm3g2
outperforming
other
harvesters.
IEEE Sensors Journal,
Год журнала:
2024,
Номер
24(9), С. 13892 - 13902
Опубликована: Март 19, 2024
Vibration
energy
harvesting
using
piezoelectric
transduction
is
becoming
a
promising
alternative
to
electrochemical
batteries
for
powering
the
low-powered
wireless
and
portable
electronic
devices.
Unlike
typical
cantilevered
vibration
harvesters
(PVEHs)
where
beam
with
tip
mass
experienced
excitation
directly,
low-frequency
from
coupled
longitudinal-transverse
of
two
magnetic
coupling-based
orthogonal
beams
(LF-PVEH)
proposed
in
this
paper.
An
attractive
feature
architecture
was
that
auxiliary
tolerated
high-shock
longitudinal
meanwhile
motion
induced
transverse
oscillation
parallel
direction
via
coupling.
To
verify
principle
feasibility
ascertain
effect
magnetically
on
dynamic
behaviors
power
generation
characteristics
LF-PVEH,
theoretical
analysis,
numerical
simulation,
experimental
testing
were
conducted,
respectively.
The
results
showed
when
amplitude
increased
3
5
mm,
output
maximum
voltage
no
more.
Besides,
by
increasing
proof
m1
20
g,
corresponding
resonance
frequency
LF-PVEH
can
be
reduced
8.5
Hz,
spatial
distance
Ly
10
optimal
effective
bandwidth
8
Hz
achieved
adapt
broadband
environments.
shows
reach
0.2
mW
at
11
load
resistance
540
kΩ.
Journal of Intelligent Material Systems and Structures,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 18, 2025
In
the
establishment
of
intelligent
transportation
systems,
traffic
markings,
often
serving
as
surface
guidance
signs
on
roads,
are
facing
an
urgent
need
for
functional
attribute
upgrades
and
innovation.
Hence,
this
study
involved
embedded
piezoelectric
film
transducers
(PFTs)
into
markings
to
endow
them
with
capabilities
energy
harvesting
signal
transmission.
A
layered
preparation
method
protecting
PFTs
optimizing
burial
depth
was
developed
validated.
The
effects
load
levels,
vibration
frequencies,
depths
open-circuit
voltage
current
responses
were
systematically
investigated.
Long-term
high-temperature
exposure
applied
thin
transducers.
results
indicated
that
effectively
protected
controlled
depth.
frequency
directly
proportional
electrical
response,
while
inversely
response.
maximum
reached
9.2
V
power
attained
8.6
mW
under
lab-based
rolling
mode.
And
6.4
doubled
after
prolonged
5
million
cycles.
high
temperature
60°C
resulted
in
a
30%
reduction
voltage.
