Machines,
Journal Year:
2023,
Volume and Issue:
11(5), P. 512 - 512
Published: April 26, 2023
This
paper
proposes
a
quasi-zero
stiffness
(QZS)
isolator
based
on
an
inclined
trapezoidal
beam
to
explore
its
advantages
in
low-frequency
passive
vibration
isolation.
The
nonlinear
of
the
due
buckling
effect
is
investigated
through
finite
element
simulation,
and
linear
positive
spring
connected
parallel
form
QZS
with
high-static
low-dynamic
performance.
natural
frequency
region
simulated
analyzed,
dynamic
response
under
different
damping
ratios,
excitation
load
conditions
explored.
prototype
was
manufactured,
static
compression
experiment
conducted
obtain
stiffness.
results
verify
correctness
simulation
conclusions.
experimental
data
demonstrate
that
has
characteristics
lower
initial
isolation
compared
equivalent
isolator.
proposed
2.91
Hz
achieves
90%
efficiency
at
7.02
Hz.
great
application
prospects
can
provide
reference
for
optimizing
or
ultra-low-frequency
isolators.
Applied Mathematics and Mechanics,
Journal Year:
2024,
Volume and Issue:
45(7), P. 1243 - 1260
Published: July 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.
Mechanical Systems and Signal Processing,
Journal Year:
2024,
Volume and Issue:
211, P. 111241 - 111241
Published: Feb. 17, 2024
This
paper
proposes
a
novel
dual-functional
nonlinear
metastructure
for
amplitude-robust
simultaneous
vibration
suppression
and
energy
harvesting,
consisting
of
combined
bistable
monostable
cubic-hardening
electromechanical
resonators
that
are
alternately
arranged
on
host
structure.
The
proposed
design
can
effectively
achieve
wide
bandgap
even
at
high
acceleration
levels,
suppress
the
undesired
resonance
transmission
peaks
outside
deemed
as
inevitable
troubles
in
conventional
linear
metastructures,
generate
power
across
broad
bandwidth
low
frequencies.
It
is
shown
experimentally
fabricated
prototype
suppresses
unwanted
by
up
to
70.5%
while
widening
52%,
compared
counterpart.
A
distributed-parameter
electromechanically
coupled
model
established
verify
experimental
measurements.
Analytical
expressions
dynamic
electrical
responses
explicitly
derived
using
harmonic
balance
method,
based
which
interplay
between
several
key
parameters
their
influences
performance
system
investigated,
including
cubic
stiffness,
mass
ratio,
load
resistance,
coupling
strength.
findings
provide
valuable
guideline
accurately
assessing
dual
capabilities
facilitate
efficient
optimization
next-generation
system.
Mechanics of Advanced Materials and Structures,
Journal Year:
2024,
Volume and Issue:
unknown, P. 1 - 13
Published: July 30, 2024
To
achieve
multiple
low-frequency
topological
interface
modes
(TIMs)
while
maintaining
lightweight
and
load-bearing
capacities
in
metamaterial
beams,
we
propose
novel
beams
equipped
with
double
quasi-zero-stiffness
(QZS)
resonators.
Following
the
introduction
of
negative
stiffness
(NS)
mechanism,
derived
dispersion
relations
QZS
resonators
using
transfer
matrix
method
(TMM),
performed
comparative
parametric
analyses
ratio
on
folded
Dirac
cones
(DCs)
locally
resonant
band
gaps
(LRBGs).
Thanks
to
NS
mechanism
degrees
freedom
(DOFs)
resonators,
can
realize
DCs
(<
500
Hz)
beams.
It
is
notable
that
adjusting
oblique
springs
tune
resonators'
effective
stiffness,
implying
custom
frequency
LRBGs
by
resonator.
By
altering
distance
between
two
obtain
topologically
distinct
unit
cells.
Transmission
simulations
confirm
presence
TIMs
at
these
domains.
We
also
find
effect
mass
geometric
defects
various
positions
minimal.
The
proposed
could
inspire
innovative
vibration
energy
harvesters
devices.
