A
novel
integrated
composite
laminate
(ICL)
with
embedded
macro-fiber
composites
(MFCs)
is
proposed
to
improve
the
vibration
reduction
performance
of
thin-walled
structures.
Its
dynamic
modeling
and
active
suppression
are
investigated.
The
structure
can
not
only
achieve
good
but
also
provide
protection
for
MFCs,
while
related
experimental
studies
rarely
reported
in
published
works.
This
paper
proposes
a
general
method
ICL
MFCs.
Considering
piezoelectric
effect
MFC
material,
semi-analytical
model
established
by
combining
first-order
shear
deformation
theory
Lagrange
equation.
On
this
basis,
state-space
equation
control
calculation
design
Proportional-Integral-Derivative
(PID)
controller
given.
Furthermore,
preparation
specimen
MFCs
introduced,
an
system
capable
testing
built.
comparative
results
simulations
experiments
demonstrate
accuracy
approach
effectiveness
capability
structure.
Finally,
effects
fiber
distribution
angle
on
structural
modal
characteristics
damping
investigated,
influence
laws
skin
plate
thickness
PID
parameters
revealed.
findings
new
technical
Proceedings of the Institution of Mechanical Engineers Part G Journal of Aerospace Engineering,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 2, 2025
The
vibration
of
a
pipeline
system
significantly
affects
the
stability
and
reliability
aircraft
industrial
equipment.
Effective
methods
are
required
to
control
vibration.
predominant
approach
for
suppression
is
passive
reduction,
which
involves
adding
damping
materials
or
its
support.
However,
effectiveness
this
method
limited,
especially
low-frequency
control.
Active
constrained
layer
(ACLD)
modern
technology
that
can
realize
effective
in
wide
frequency
range.
Adding
elastic
ACLD
forms
an
enhanced
active
constraint
(EACL)
structure,
further
improve
effect.
In
study,
test
platform
was
used
investigate
influence
various
parameters
EACL
on
vibration-damping
effect
pipeline,
supported
by
metal
clamps.
results
demonstrated
decreased
12.8
dB
when
activated,
verifying
reduction
pipeline.
Additionally,
effects
viscoelastic
thickness,
location
coverage
length
layer,
voltage
were
all
discussed.
An
intriguing
phenomenon
regarding
stress
discovered.
Vibration
drops
middle
while
increasing
close
actuator.
Therefore,
should
be
considered
engineering
applications
systems.
These
findings
significant
provide
efficient
design
guidelines
Sensors,
Journal Year:
2025,
Volume and Issue:
25(2), P. 463 - 463
Published: Jan. 15, 2025
Pulsation
noise
in
the
piping
system
generated
by
excitation
of
pump
source
seriously
affects
reliability
pipeline
and
mechanical
equipment.
The
active
control
can
effectively
suppress
low-frequency
liquid-filled
pipeline.
Active
methods
with
intrusive
secondary
sources
generally
use
dynamic
pressure
sensors
or
hydrophones
to
collect
signals,
which
destroy
structure
pipe.
In
this
paper,
we
propose
an
method
utilizing
signals
acquired
accelerometers,
adopts
offline
modeling
path
notch
narrowband
FxLMS
algorithm
for
controlling
actuation.
feasibility
is
verified
LabVIEW
simulation
test
results
show
that
achieve
more
than
4
dB
reduction
(10~200
Hz)
line
spectrum
under
most
operating
conditions.
Scientific Reports,
Journal Year:
2025,
Volume and Issue:
15(1)
Published: Jan. 15, 2025
To
suppress
the
significant
vibration
line
spectra
of
piping
systems
under
multi-frequency
harmonic
excitations,
a
novel
dynamic
absorber
(NDVA)
is
designed.
The
NDVA
integrates
numerous
independent
resonant
units
within
finite
space
through
an
ingenious
structural
design
and
possesses
rich
frequency
regulation
characteristics.
A
model
system
equipped
with
established,
approximate
equivalent
parameters
both
are
inverted
based
on
response
function
(FRF)
test
results.
These
can
be
substituted
into
to
enhance
accuracy
validity
theoretical
calculations.
Based
relationship
between
absorbing
bandwidth
intervals
excitation
frequencies,
tailored
strategy
for
different
densities
frequencies
proposed.
Subsequently,
reduction
capability
verified
example
involving
dual-frequency
excitations.
When
there
notable
difference
in
intensities
spectra,
genetic
algorithm
utilized
optimize
mass
allocation
units.
Simulation
results
demonstrate
that
maximum
amplitude
optimized
further
reduced.
