| dc.description.abstract | Recently, noise is regarded as something very disturbing especially during
the day time but as long as the noise is still within its tolerance, people usually do
not care abcn,l;f it. Cons<:iQus.ly or un<:ons<;iou§(y, noist;I </,Qt;IS not h.e!V? good effect to
human health such as temporary deafness, psychologi.cal disorders (trauma), and
other health problems. Noise control not only reduces the noise sources but also
makes barrier using dampening materials. The dampening materials are seldom
found whereas they are very important because they are the colsest to human daily
life. Coeffki?.nt absorption (a) is on?. oft~ importqn( pqrqm?.t?.rs in tktermining to
what extent a material can absorb/reduce the noise. Rockwool has been long used
as si/incer but the Rockwool can be mixed with polyester then it is tested to obtain
the absorptive and tensile strength of the composite with Rockwool fiber filling.
The method of Reverberation Room is one of the testing methods to obtain the
cQefji<;ient qbsQrption_ of a matt?riq(, this mt?thP4 will b?. ~?.4. in this tt?st in which all
of the noise energy will be diffused to the room thet the level of noise pressure on
all points in the room is equally ideal, and the reverberation time is measured. In
addition, to obtain the coefficient absorption, a simulation using NX NASTRAN for
FEMAP software is conducted. The result of this test showed that the tensile
strength found was 27.S4 Mfa. .. Mo4.ul~ El&ti<; wa.s 18,7,l MPa, and thtf density
was 1336.8 kg/m3
, coefficient absorption of the result of experiment a =
0.56483410 at frequency of 100 Hz, the result of simulation a = 0.579 at frequency
of400Hz. | en_US |
