Abstract:
The
identification of material’s
specific mechanical properties can be
achieved
by
analyzing its dynamic resonance or dynamic pulse response. This
paper
proposes
a
method to find the
correlation between a specific material mechanical property and the specific coefficient (
7
Z
∞
)
by the
application of an alternative statistical analysis
method called Multilevel Integrated Kurtosis Algorithm
with Z
-
notch Filter (I
-
kaz Multilevel). In this study, four rectangular bars with different materials were
excited by impact test. An impact ham
mer was used as the impactor which
connected to the puls
e
analyzer and then to the computer to measure the force applied during the impact. The
test was
conducted in an anechoic room and
an accelerometer sensor was used to capture the
vibration
responses generated during the impact test
.
The signals were analyz
ed using I
-
kaz
Multilevel signal
analysis to determine value of
7
Z
∞
coefficients for each impact test
for
the four materials. The plot of
I
-
kaz Multilevel coefficients versus impact forces reveals a quadratic curve with
the
average R squared
values
equal
to
0.998
. The coefficient value of the quadratic equation
for each curve that represents
each material
can be used to correlate the mechanical loss coefficient of the material mechanical
properties for vibration signal analysis.
