In
this
work,
a
technique
to
improve
the
magnetic
frequency
up-conversion
(FuC)
of
piezoelectric
energy
harvesters
at
low
velocities
interaction
(0.4
m/s
-
0.6
m/s)
is
proposed.
The
magnets
used
in
FuC
are
shielded
with
additional
material
and
opposite
polarization
aim
making
force-distance
curve
between
blocks
sharper.
concept
investigated
both
analytically
experimentally.
A
mesoscale
harvester
then
simulated
low-frequency
(5
Hz).
results
show
that
proposed
improves
impulsiveness
power
gain
about
36x
obtained
an
amplitude
velocity
equal
m/s.
Sensors and Actuators A Physical,
Journal Year:
2023,
Volume and Issue:
362, P. 114667 - 114667
Published: Sept. 20, 2023
This
work
presents
an
investigation
on
the
dynamics
of
a
magnetically
frequency
up-converted
piezoelectric
energy
harvester.
The
magnetic
interaction
arises
between
tip
magnet
bimorph
and
moving
magnet.
latter
is
controlled
through
low-frequency
shaker
at
fixed
3
Hz.
We
investigate
in
detail
effect
increasing
velocity
magnets
same
input
frequency,
terms
up-conversion
(i.e.
migration
from
slow
to
fast
dynamics).
show
that,
for
interaction,
first
bending
mode
gradually
appears.
Also
material
nonlinearities
are
observed
as
shift
mode.
shows
also
that
plucking
phenomenon
can
be
reliably
simulated
by
means
reduced
order
model
takes
into
account
nonlinearities.
Actuators,
Journal Year:
2023,
Volume and Issue:
12(12), P. 456 - 456
Published: Dec. 8, 2023
Vibration-based
energy
harvesting
has
garnered
considerable
attention
from
researchers
over
the
past
two
decades,
using
different
transduction
mechanisms.
In
this
context,
utilization
of
piezoelectric
materials
proven
to
be
highly
successful,
due
their
power
density,
across
a
broad
range
voltages.
A
primary
challenge
in
environmental
vibration
lies
frequency
mismatch
between
devices,
which
typically
exhibit
optimal
performance
at
hundreds
or
thousands
hertz
small
size
(centimeter
millimeter)
and
vibration.
The
latter
density
around
tens
hertz.
For
reason,
last
15
years,
scientific
community
concentrated
on
exploring
techniques
for
band
broadening
up-conversion
by
intentionally
introduced
(or
designed)
nonlinearities.
This
review,
following
an
introduction
topic
harvesting,
provides
description
primarily
developed
mechanisms,
presenting
chronological
development
each,
initial
works
most
recent
advancements.
Additionally,
review
touches
upon
implementation
efforts
micro-electromechanical
systems
(MEMS)
scale
each
described
technique.
Finally,
incorporation
nonlinearities
through
electronic
circuits
enhance
is
briefly
discussed.
2022 IEEE International Conference on Metrology for Extended Reality, Artificial Intelligence and Neural Engineering (MetroXRAINE),
Journal Year:
2023,
Volume and Issue:
unknown, P. 377 - 382
Published: Oct. 25, 2023
Vibration
energy
harvesting
is
a
clean
way
to
extract
kinetic
from
the
environment
and
convert
it
into
electrical
that
can
be
used
locally
power
small
electronic
devices,
like
sensors
low-power
systems.
A
vibration
harvester
embedded
transducer,
allowing
easy
repositioning
of
device,
providing
permanent
supply,
with
no
need
for
batteries
or
cables.
In
industrial
environments,
machines
in
operating
conditions
provide
large
source
mechanical
vibrations.
The
majority
devices
have
been
proposed
literature
use
single
degree
freedom
configuration,
where
an
oscillating
mass
constrained
vibrate
one
direction
only.
When
changing
direction,
such
are
much
less
efficient.
this
paper,
planar
two
degrees
configuration
natural
frequency
oscillator
independent
excitation.
This
potentially
allows
more
efficient
harvested
practical
circumstances.
Micromachines,
Journal Year:
2024,
Volume and Issue:
15(7), P. 842 - 842
Published: June 28, 2024
A
frequency
up-conversion
piezoelectric
energy
harvester
(FUC-PEH)
consists
of
a
force
amplifier,
stack,
low-frequency
oscillator
(LFO),
and
stop
limiter.
The
amplifier
generates
the
amplification
stress
on
stack.
LFO,
comprising
spring
mass
block,
impacts
limiter
during
vibration
to
induce
high-frequency
oscillations
within
In
this
paper,
we
represent
simplify
FUC-PEH
as
lumped-parameter
model
based
material
constitutive
equations
structural
dynamic
theories.
Using
electromechanical
analogy,
developed
an
equivalent
circuit
(ECM)
FUC-PEH.
parametric
study
was
performed
investigate
impact
system
parameters,
such
stiffness
concentrated
mass,
performance.
collision-induced
amplitude
truncation
(AT)
effect
enlarges
operation
bandwidth.
ECM
simulations
show
that
input
excitation
is
converted
into
output
response,
enhancing
conversion
efficiency.
Furthermore,
aimed
improve
FUC-PEH's
performance
using
synchronous
electric
charge
extraction
(SECE)
circuit.
approach,
established
system-level
considers
coupling
behavior.
simulation
results
provide
insights
FUC
harvesters
with
SECE
circuits
offer
valuable
design
guidance.
Journal of Applied Sciences and Nanotechnology,
Journal Year:
2023,
Volume and Issue:
3(2), P. 87 - 96
Published: June 1, 2023
This
paper
presents
a
novel
laser
pulse
energy
measurement
method
based
on
photoacoustic
converters.
The
concept
of
design
and
built
meters
using
PZT
as
three
specimens
have
diameter
(20,
24,
25)
mm,
coating
SiO2
was
chosen
in
this
test
because
it
has
special
properties,
is
affordable,
compact
size.
Genetic
are
expensive.
Comparing
the
genetic
meter
(used
study
that
manufactured
pyroelectric
material
PZT/SiO2).
outcomes
demonstrated
within
pulse's
(100-400mJ).
Peak
voltage
values
for
composites
range
from
0.48
to
0.84
volts
at
output
their
increases
(PZT-S
with
20
mm).
ranges
PZT-M
(diameter
24
mm)
PZT-B
25
0.18
0.68
0.08
0.56
volts,
respectively.
been
characterized
by
measured
sources.
A
piezoelectric
actuator
had
fabricated
silicon
sand
wafer
converting
light
waves
(the
pulse)
into
shock
waves.
Unlike
type
(pyroelectric)
genetic-,
created
(PZT/SiO2)
unaffected
Damage
caused
high
temperatures
Nd:YAG
energy.
Journal of Applied Physics,
Journal Year:
2023,
Volume and Issue:
134(18)
Published: Nov. 8, 2023
Global
energy
shortage
puts
stringent
demand
for
harvesters
capable
of
transforming
external
green
vibration
sources
into
electrical
power.
Employing
a
self-biased
magnetoelectric
(ME)
composite
FeCuNbSiB/Ni/PZT
(lead
zirconate
titanate),
prototype
harvester
is
designed
and
fabricated.
The
has
circular
orbit
in
which
permanent
magnetic
cylinder
reciprocates
once
an
initial
kinetic
provided.
Upon
signal,
like
handshaking,
movement
the
causes
alternative
field,
was
applied
on
ME
composite.
Via
magnetic-force-electrical
coupling,
produces
output
voltage.
Finite
element
simulation
carried
out
to
reveal
underlying
mechanism
harvester.
analysis
shows
that
maximum
voltage
7.63
V
can
be
obtained
original
potential
magnet.
In
particular,
magnet
moves
back
forth
automatically
inside
with
no
need
further
apply
energy.
effectiveness
experimentally
verified.
When
handshaking
harvester,
open-circuit
5.51
generated.
study
offers
solution
power
supplying
some
miniaturized
or
portable
devices,
such
as
small
hand
set
pedometer.
Smart Materials and Structures,
Journal Year:
2024,
Volume and Issue:
33(12), P. 125015 - 125015
Published: Nov. 2, 2024
Abstract
The
rapid
advancement
of
electronic
devices
and
wireless
sensors
has
heightened
the
demand
for
energy
sustainability
portable
power
solutions.
Traditional
human
harvesters
have
limitations
in
harvesting
from
ultra-low-frequency
motion
due
to
issues
related
unstable
output
wearing
comfort.
To
address
this
challenge,
a
piezoelectric–electromagnetic
hybrid
(HP-EEH)
structure
designed
hip
joint
area.
This
innovative
design
employs
magnetically
coupled
frequency
boosting
alongside
electromagnetic
capture
achieve
high
power.
Firstly,
principle
device
are
introduced,
electromechanical
coupling
model
harvester
is
derived
using
Hamilton’s
principle.
Furthermore,
system
numerically
simulated,
voltage
characteristics
piezoelectric
unit
analyzed
by
finite
element
analysis
software.
Finally,
experimental
setup
constructed,
tested
different
swinging
angles
positions.
results
show
that
two
parts
can
be
captured
simultaneously
under
conditions.
At
swing
angle
50
degrees,
units
achieved
maximum
values
14.96
µ
W
at
0.8
Hz
10.4
1.2
Hz,
respectively.
Incorporating
aims
consumption
requirements
low-power
better.
