A novel dual piezoelectric-electromagnetic energy harvester employing up-conversion technology for the capture of ultra-low-frequency human motion
Applied Energy,
Год журнала:
2024,
Номер
368, С. 123479 - 123479
Опубликована: Май 21, 2024
As
the
realm
of
smart
wearable
electronic
devices
undergoes
continuous
evolution,
tapping
into
energy
generated
by
everyday
human
movement
presents
a
compelling
alternative
to
conventional
batteries
for
powering
these
devices.
However,
harvesting
face
limitations
in
capturing
from
ultra-low
frequency
mechanical
excitation.
This
paper
proposes
novel
dual
piezoelectric-electromagnetic
harvester
(DHEH).
The
DHEH
consists
two
PZTs
comprising
piezoelectric
unit
(PEH),
arc-shaped
driving
magnets,
and
sets
coils
constituting
electromagnetic
(EMEH).
magnet
facilitates
coupling
between
units,
serving
generate
relative
motion
with
triggering
operation
PZTs.
excitation
magnets
can
penetrate
completely.
Meanwhile,
employing
repelling
orientation
effectively
enhance
power
generation
efficiency
EMEH.
Experimental
findings
indicate
that
under
an
external
2
Hz
acceleration
0.6
g,
optimal
load
resistance
Piezoelectric
Energy
Harvester
(PEH)
is
80
kΩ,
yielding
maximum
output
0.306
mW.
For
EMEH,
best-matched
96
Ω,
resulting
10.65
mW,
density
86.3
μW/cm3.
Compared
non-hybrid
solution,
adopting
hybrid
approach
increases
PEH
approximately
23-fold.
Furthermore,
hand-shaking
tests
reveal
fabricated
prototype
common
portable
devices,
demonstrating
its
significant
potential
practical
applications.
Язык: Английский
A method to enhance the nonlinear magnetic plucking for vibration energy harvesters
Meccanica,
Год журнала:
2024,
Номер
59(9), С. 1577 - 1592
Опубликована: Авг. 2, 2024
Abstract
In
this
work,
a
technique
to
improve
the
magnetic
plucking
for
frequency
up-conversion
in
piezoelectric
energy
harvesters
is
presented.
The
involves
shielded
magnets
with
Neodymium-iron-boron
alloy
polarized
opposite
direction
on
main
magnet.
phenomenon
investigated
both
at
computational
and
experimental
level.
Subsequently,
simulations
mesoscale
harvester
are
presented
which
demonstrate
gain
of
17
times
if
comparison
classical
(i.e.
without
shielding).
finds
useful
applications
benefits
field
low-speed
low-frequency
vibration
harvesting,
as
well
actuation
sensing.
Язык: Английский
A novel cut-out piezoelectric beam with limiters for broadband energy harvesting
International Journal of Non-Linear Mechanics,
Год журнала:
2024,
Номер
unknown, С. 104919 - 104919
Опубликована: Окт. 1, 2024
Язык: Английский
Harvesting vibration energy by quad-stable piezoelectric cantilever beam: Modeling, fabrication and testing
European Journal of Mechanics - A/Solids,
Год журнала:
2024,
Номер
107, С. 105389 - 105389
Опубликована: Сен. 1, 2024
Язык: Английский
Passive Frequency Tuning of Kinetic Energy Harvesters Using Distributed Liquid-Filled Mass
Actuators,
Год журнала:
2025,
Номер
14(2), С. 78 - 78
Опубликована: Фев. 7, 2025
Micro-scale
kinetic
energy
harvesters
are
in
large
demand
to
function
as
sustainable
power
sources
for
wireless
sensor
networks
and
the
Internet
of
Things.
However,
one
challenges
associated
with
them
is
their
inability
easily
tune
frequency
during
manufacturing
process,
requiring
devices
be
custom-made
each
application.
Previous
attempts
have
either
used
active
tuning,
which
consumes
power,
or
passive
that
increase
footprint,
thus
decreasing
density.
This
study
involved
developing
a
novel
method
does
not
alter
device
footprint
It
creating
proof
mass
an
array
chambers
cavities
can
individually
filled
liquid
overall
well
center
gravity.
The
resonant
rectangular
cantilever
then
altered
by
changing
location,
density,
volume
liquid-filled
mass.
resolution
enhanced
increasing
number
chambers,
whereas
tuning
range
increased
amount
density
liquids
fill
cavities.
A
piezoelectric
340
Hz
initial
was
testing
device.
Liquids
varying
(silicone
oil,
sodium
polytungstate,
Galinstan)
were
investigated.
frequencies
measured
experimentally
filling
various
these
determine
resolution.
ranges
first
mode
142–217
Hz,
108–217
78.4–217
silicone
Galinstan,
respectively,
sub
Язык: Английский
Theoretical Analysis and Experimental Verification of 2-DOF Linkage Piezoelectric Energy Harvesting
Actuators,
Год журнала:
2025,
Номер
14(2), С. 82 - 82
Опубликована: Фев. 9, 2025
In
the
process
of
energy
harvesting,
vibration
harvesting
still
has
several
disadvantages,
including
a
high-threshold
excitation
and
narrow
working
bandwidth.
Therefore,
2-degrees-of-freedom
piezoelectric
harvester
is
proposed.
By
introducing
nonlinear
magnetic
force
to
system,
bandwidth
energy-harvesting
efficiency
three
magnetically
coupled
cantilever
beams
can
be
effectively
improved.
this
paper,
mathematical
model
consisting
electrically
beam
systems
established,
governing
equations
electric
coupling
are
solved
numerically
verified
experimentally.
The
dynamic
characteristics
under
different
excitations
frequencies
studied.
experiment
shows
that
increased
by
controlling
distance
between
pairs
circular
magnets
changing
frequency
induce
resonance.
Thus,
self-power
requirement
micro-power
devices
realized.
Overall,
study
provides
promising
solution
for
improving
performance
harvesters
offers
theoretical
insights
designing
vibrating
harvesters.
Язык: Английский
Design and Analysis of Piezoelectric Energy Harvester for Wireless Sensor Networks
Lecture notes in computer science,
Год журнала:
2024,
Номер
unknown, С. 239 - 254
Опубликована: Окт. 17, 2024
Язык: Английский
A stochastic averaging mathematical framework for design and optimization of nonlinear energy harvesters with several electrical DOFs
Communications in Nonlinear Science and Numerical Simulation,
Год журнала:
2024,
Номер
139, С. 108306 - 108306
Опубликована: Авг. 30, 2024
Energy
harvesters
for
mechanical
vibrations
are
electro-mechanical
systems
designed
to
capture
ambient
dispersed
kinetic
energy,
and
convert
it
into
usable
electrical
power.
The
random
nature
of
vibrations,
combined
with
the
intrinsic
non-linearity
harvester,
implies
that
long,
time
domain
Monte-Carlo
simulations
required
assess
device
performance,
making
analysis
burdensome
when
a
large
parameter
space
must
be
explored.
Therefore
simplified,
albeit
approximate,
semi-analytical
technique
is
paramount
importance.
In
this
work
we
present
methodology
design
nonlinear
piezoelectric
energy
vibrations.
based
on
application
model
order
reduction,
project
dynamics
onto
lower
dimensional
space,
stochastic
averaging,
calculate
stationary
probability
density
function
reduced
variables.
distribution
used
expectations
most
relevant
quantities,
like
output
voltage,
harvested
power
efficiency.
Based
our
previous
works,
consider
an
harvester
matching
network,
interposed
between
load,
reduces
impedance
mismatch
two
stages.
applied
optimization
allowing
maximize
global
conversion
We
show
proposed
gives
accurate
predictions
harvester's
can
significantly
simplify
analysis,
device.
Язык: Английский
Experimental Study of the Energy Regenerated by a Horizontal Seat Suspension System under Random Vibration
Energies,
Год журнала:
2024,
Номер
17(17), С. 4341 - 4341
Опубликована: Авг. 30, 2024
This
article
introduces
a
novel
regenerative
suspension
system
designed
for
active
seat
suspension,
to
reduce
vibrations
while
recovering
energy.
The
employs
four-quadrant
electric
actuator
operation
model
and
utilizes
brushless
DC
motor
as
an
energy
harvester.
motor,
permanent
magnet
synchronous
type,
transforms
into
three-phase
AC
power,
serving
dual
purposes
of
vibration
recovery
power
generation.
system’s
advanced
control
is
achieved
through
the
switching
MOSFET
transistors,
ensuring
meets
operational
criteria
that
contrast
with
traditional
vibro-isolation
systems,
thereby
reducing
negative
effects
mechanical
on
human
body,
also
lowering
consumption.
Comparative
studies
dynamics
against
passive
systems
under
random
demonstrated
its
effectiveness.
research
assessed
performance
spectral
density
transmissibility
functions,
highlighting
potential
enhance
efficiency
psychophysical
well-being
individuals
subjected
vibrations.
effectiveness
regeneration
process
chosen
early
excitation
was
investigated.
Measurements
torque
in
mode
during
braking
mode,
corresponding
phase
currents
are
presented.
Язык: Английский
Potential of coupled array harvester in enhanced energy harvesting
Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences,
Год журнала:
2024,
Номер
382(2281)
Опубликована: Сен. 9, 2024
Harvesting
energy
from
nonlinear
systems
has
been
at
the
centre
of
research
in
harvesting
community.
Many
such
proposed
are
single
harvester.
While
these
show
an
increase
bandwidth
frequency,
overall,
they
not
effective
enough
power
generation.
This
article
studies
and
frequency
characteristics
array
harvesters.
Multiple
harvesters
considered
with
linear
coupling
between
The
phenomena
internal
resonance
(IR)
stochastic
(SR)
reported.
IR
multiple
coupled
is
explored
using
multiple-scale
analysis.
A
parametric
study
conducted
to
demonstrate
effect
strength,
mistuning,
innate
nonlinearity
other
parameters.
helped
establish
ways
bandwidth.
Moreover,
a
stochastically
loaded
linearly
bistable
harvester
numerically
analysed
find
strength
size
on
phenomenon
SR
system’s
performance.
Through
studies,
potential
enhanced
demonstrated
under
both
harmonic
excitation.
part
theme
issue
‘Celebrating
15th
anniversary
Royal
Society
Newton
International
Fellowship’.
Язык: Английский