| dc.description.abstract | Acoustic material is a material engineering whose main function is to absorb the
sound. Acoustic material is a material that can absorb sound energy, but the
amount of absorbed energy is different for each material. The general objective of
this research is to analyze the physical properties and sound absorption
coefficient of composite polymeric foam material reinforced by palm trunk fiber to
be used on airframe. From this research found that the variable II has a good
physical properties and mechanical properties with mass of 1,6367g, 3,03ml
volume, and the density of 539,56݇݃ ݉ ⁄ ଷ. And for sound absorption test is used to
test specimens with variable II. The frecuency of the most well-absorbed by the
composite material is at an intermediate frecuency. For the thickness of 5mm
highest absorption coefficient of 0,5557 which is the frequenct of 1500Hz, while
the 10mm thickness of the absorption coefficient maximum of 0,5060 at a
frequency of 1000Hz, and the 15mm thickness of the absorption coefficient
maximum of 0,5109 at a frequency of 500Hz | en_US |
