Asymmetric bistable shock isolators for repeated force-transfer nullification using optimal payload return
Jinhong Noh,
Pilkee Kim,
Yong‐Jin Yoon
и другие.
Mechanical Systems and Signal Processing,
Год журнала:
2025,
Номер
225, С. 112265 - 112265
Опубликована: Янв. 7, 2025
Язык: Английский
Tip-clearance pressure fluctuations between conventional pump-jet propulsor and pump-jet propulsor with rotor blade crown in non-uniform inflow
Physics of Fluids,
Год журнала:
2025,
Номер
37(2)
Опубликована: Фев. 1, 2025
The
suppression
of
the
pressure
fluctuations
in
tip
clearance
pump-jet
propulsor
is
great
significance
improving
its
noise
radiation
level.
This
study
considers
adding
rotor
blade
crown
structure
to
propose
a
new
type
propulsor.
hydrodynamic
performance
conventional
and
with
was
analyzed
non-uniform
inflow
conditions
by
conducting
experimental
tests
numerical
simulation.
results
show
that
after
introduction
crown,
open
water
coefficients
two
types
propulsors
similar
trends.
However,
thrust
torque
propulsion
efficiency
are
slightly
smaller
than
those
Furthermore,
temporal
spatial
distribution
pulsating
flow
direction
changed,
inside
near
suppressed.
line
spectra
characteristic
all
at
passing
frequency
harmonics,
reduced
varying
degrees.
Theoretically,
range
spectrum
magnitude
reduction
2.78–24.07
dB,
while
obtained
test
0.66–19.42
dB.
provides
an
important
theoretical
basis
engineering
reference
for
level
propulsors.
Язык: Английский
Design Methodology and Application Dynamics of Compact Quasi-Zero Stiffness Isolators
Applied Sciences,
Год журнала:
2025,
Номер
15(7), С. 3478 - 3478
Опубликована: Март 22, 2025
With
the
rapid
development
of
precision
instruments,
aerospace,
and
automotive
industries,
demand
for
compact
vibration
isolators
capable
suppressing
low-frequency
vibrations
has
surged.
Although
prior
reviews
have
established
theoretical
framework
quasi-zero
stiffness
(QZS)
isolators,
critical
gaps
persist
in
addressing
their
design
under
strong
nonlinear
dynamics
diverse
engineering
constraints.
This
review
systematically
analyzes
dynamic
characteristics
QZS
systems
effects
evaluates
five
innovative
methodologies
isolators:
special
spring
type,
magnetic
bionic
metamaterials-based
origami-inspired
type.
Key
findings
reveal
that
spring-type
are
simple
to
space-efficient
but
difficult
machine.
Magnetic-type
achieve
ultra-low
start-up
frequencies
face
thermal
instability.
Metamaterial
designs
enable
multifunctional
integration
at
cost
manufacturing
complexity,
while
bionic-inspired
abstract
practical
applications.
We
find
current
research
tends
prioritize
miniaturization
over
synergistic
optimization
load
capacity,
broadband
isolation,
adaptability.
Future
should
focus
on
multi-degree-of-freedom
systems,
coupled
metamaterials-bionic
structures,
active
control.
work
provides
a
key
roadmap
advancing
technology
space-constrained
Язык: Английский
A quasi-zero-stiffness metastructure for concurrent low-frequency vibration attenuation and energy harvesting
Thin-Walled Structures,
Год журнала:
2025,
Номер
unknown, С. 113371 - 113371
Опубликована: Апрель 1, 2025
Язык: Английский
Inverse design of variable-thickness curved-beam structures for nonlinear mechanical signal transformation
Thin-Walled Structures,
Год журнала:
2025,
Номер
unknown, С. 113419 - 113419
Опубликована: Май 1, 2025
Язык: Английский
On the combined iteration scheme of harmonic balance-pseudo arclength-extrapolation method applied to the nonlinear systems with nonlinear damping and time delay
Nonlinear Dynamics,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 14, 2025
Язык: Английский
A linear planar magnetic spring for 2-DOF vibration isolation
International Journal of Mechanical Sciences,
Год журнала:
2025,
Номер
unknown, С. 110432 - 110432
Опубликована: Май 1, 2025
Язык: Английский
Planar Two-Dimensional Vibration Isolator Based on Compliant Mechanisms
Micromachines,
Год журнала:
2024,
Номер
16(1), С. 10 - 10
Опубликована: Дек. 25, 2024
In
practical
engineering
applications,
the
vibration
is
often
generated
in
various
directions
and
can
be
harmful
to
equipment.
Thus,
it
necessary
develop
isolators
that
reduce
multiple
directions.
this
paper,
we
propose
a
planar
two-dimensional
isolator
based
on
compliant
mechanisms.
The
proposed
mechanism
consists
of
two
negative
stiffness-compliant
modules
positive
modules,
which
leads
quasi-zero
stiffness
(QZS)
property
mechanism.
dynamic
model
established
by
using
third-order
Taylor
expansion
harmonic
balance
method.
Based
model,
influence
different
parameters
displacement
transmissibility
discussed,
including
damping
ratio,
system
stiffness,
excitation
amplitude.
Finally,
conducted
isolation
experiments
obtained
isolator.
results
verify
has
good
performance
for
low-frequency
vibration.
Язык: Английский