CHARACTERIZATION OF PERFORMANCE ACOUSTIC SANDWICH COMPOSITE WITH A CORE OF POLYURETHANE FOAM-AGAVE SISALANA FIBER REINFORCED POLYESTER FOR NOISE ABSORPTION
ABSTRACT: Absorber material
has characteristic of
acoustic that reflect
and absorb sound
wave. Absorption by porous material is very useful to reduce the sound
power level that occurs so as to reduce
the noise in
the room. The
sound absorbtion coefficient
of the Acoustic
Sandwich Composite (ASC) was
determined by a
two-microphone impedance measurement
according to international standard
ASTM 1050-98. Dimension
of The ASC
consist of 1
core and 2
skin with diameter 100
mm. Skin on
front side designed
has 5 hole
(d=10 mm) and
used 4 different thickness of polyurethane foam
(PU-Foam) that is 10, 20, 30 and 40 mm used as core of ASC. The skin on both
sides of sandwich composite made from continuous and chopped agave sisalana
fibre reinforced polyester with
thickness 5 mm.
Value of Noise
Absorption Coefficient (NAC)
is given from 0 to 1, which means
sound absorption is none in value 0, and sound absorption reaches the maximum in
value 1 on
frequency range 0
Hz -1.6 kHz.
This case, it
is shown on
the foam with thickness 30 mm is good in the low
frequency range with the higest value of NAC is 0,46. The ASC designed of
thickness 30 mm
foam core can
raise reach value
of the NAC
in the low
frequency (400 Hz-1000 Hz),
highest value 0.80
at frequency 800
Hz. The ASC
of thickness 10
mm foam core to
be optimum for
middle frequency (1000
Hz-1600), highest value
0.89 at frequency
1200 Hz.
Author: Ferriawan Yudhanto,
Andika Wisnujati, Iwan Yahya
Journal Code: jptindustrigg150007
