Sensors and Actuators A Physical,
Journal Year:
2023,
Volume and Issue:
360, P. 114525 - 114525
Published: June 30, 2023
Piezoelectric
energy
harvesting
techniques
are
increasingly
seen
as
promising
power
sources
for
wireless
sensor
networks
that
monitor
railway
infrastructure.
However,
the
piezoelectric
generators
currently
available
applications
suffer
from
low
output,
well
inadequate
durability
and
robustness.
To
tackle
these
issues,
this
study
introduces
a
novel,
high-power,
sturdy
piezo
stack
harvester's
design,
optimization,
testing
powering
in
rail
systems.
The
aim
is
to
improve
both
output
robustness
of
device.
proposed
high-power
generation
facilitated
by
frequency
up-conversion
mechanism,
mechanical
transformer
design
application
stack's
compression
mode
(d33
mode).
mechanism
allows
harvester
function
at
low-frequency
track
vibrations
with
high
power.
significantly
magnifies
force
exerted
on
stack.
boots
conversion
efficiency
due
its
higher
coupling
factor.
enhance
robustness,
innovative
approaches
employed.
optimized
maximum
transmission
without
exceeding
material's
fatigue
limit.
Moreover,
designed
operate
under
pre-compression,
preventing
tensile
stress
taking
advantage
ceramics'
remarkable
compressive
strength.
Plate
springs
also
integrated
into
maintain
motion
along
vibration
direction.
Experimental
results
prototype
provide
strong
evidence
ability
sensor.
A
511
mW
an
average
24.5
achieved
harmonic
excitation
21
Hz
0.7
RMS
(Root
Mean
Square)
g,
while
568
7.3
generated
measured
signal.
Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: Aug. 9, 2024
In
light
of
the
crucial
role
marine
ecosystems
and
escalating
environmental
conservation
challenges,
it
is
essential
to
conduct
monitoring
help
implement
targeted
protection
measures
efficiently.
Energy
harvesting
technologies,
particularly
triboelectric
nanogenerators
(TENGs),
have
great
potential
for
prolonging
lifespan
enhancing
reliability
sensors
in
remote
areas.
However,
high
internal
resistance,
low
current,
friction-induced
abrasion
issues
TENGs
limit
their
performance
practical
applications.
This
work
presents
a
rolling
mode
nanogenerator
that
utilizes
multi-tunnel
grating
electrodes
opposite-charge-enhancement
mechanism
harvest
wave
energy
The
device
achieves
significant
instantaneous
root
mean
square
power
density
185.4
W/(m
iScience,
Journal Year:
2023,
Volume and Issue:
26(9), P. 107674 - 107674
Published: Aug. 18, 2023
Wind
energy
is
crucial
for
meeting
climate
and
sustainability
targets.
Small
wind
turbines
(SWTs)
have
gained
significant
attention
due
to
their
size
adaptability.
These
potential
Internet
of
Things
(IoT)
applications,
particularly
in
powering
large
areas
low-power
devices.
This
review
examines
SWTs
IoT
providing
an
extensive
overview
development,
including
rectifiers,
power
generation
mechanisms,
applications.
The
paper
summarizes
compares
different
types
explores
recent
advancements
representative
work,
discusses
applicable
generator
systems
such
as
electromagnetic,
piezoelectric,
triboelectric
nanogenerators.
In
addition,
it
thoroughly
reviews
the
latest
research
on
application
scenarios,
transportation,
urban
environments,
intelligent
agriculture,
self-powered
sensing.
Lastly,
identifies
future
directions
emphasizes
interdisciplinary
technologies
driving
SWT
development.
Advanced Functional Materials,
Journal Year:
2023,
Volume and Issue:
33(27)
Published: April 5, 2023
Abstract
Studies
on
the
enhancement
of
output
performance
are
widely
presented
based
theory
characteristics
for
sliding‐mode
triboelectric
nanogenerators
(TENGs).
However,
few
studies
reported
to
investigate
electromechanical
coupling
external
force
onto
S‐TENG
due
its
fuzzy
influence
electrical
performance.
In
order
study
effect
pre‐stress
S‐TENGs,
in
this
work,
a
novel
strategy
adding
flexible
magnet
layers
is
first
proposed
electrification
and
induced
by
magnetic
(or
magnetically
stresses
nanogenerator,
MS‐TENG)
both
theoretically
experimentally.
The
characteristic
MS‐TENG
studied
introducing
coefficient.
Considering
pre‐stress,
load
resistances,
sliding
frequency
at
low
speed,
relevant
derived
through
equivalent
circuit
model.
Furthermore,
corresponding
experiments
conducted
experimental
results
present
good
agreement
with
theoretical
calculations,
which
effectively
reveal
principle
MS‐TENG.
This
work
aimed
providing
description
validations
pre‐stresses
S‐TENGs.
Energy & environment materials,
Journal Year:
2024,
Volume and Issue:
7(5)
Published: Jan. 22, 2024
In
engineering
practice,
the
output
performance
of
contact
separation
TENGs
(CS‐TENGs)
increases
with
increase
tribo‐pair
area,
which
includes
increasing
size
single
layer
CS‐TENGs
(SCS‐TENGs)
or
number
units
(zigzag
TENGs).
However,
such
two
strategies
show
significant
differences
in
power
and
density.
this
study,
to
seek
a
universal
CS‐TENG
design
solution,
SCS‐TENG
zigzag
TENG
(Z‐TENG)
is
systematically
compared,
including
voltage,
current,
transferred
charge,
instantaneous
density,
charging
The
relationship
between
area
voltages
explored,
voltage
equation
fitted.
experimental
results
reveal
that
SCS‐TENGs
yield
better
than
Z‐TENGs
terms
power,
density
under
same
total
area.
energy
loss
during
transfer
mechanical
energy,
aggravated
by
units.
peak
up
22
times
Z‐TENG
(45
cm
2
).
Furthermore,
capacitor
131%
Z‐TENGs,
are
relatively
close.
feasible
alternative
when
working
space
limited.
