Indonesia Conference Directory

SONAR (Sound Navigation and Ranging) has been widely applied civilian and military needs. In order to avoid detection of enemy active sonar, submarines are equipped with acoustic tile which functions to absorb signals from active sonar and reduce the noise caused by the submarine itself. Polyisobutylene which is an active ingredient of material acoustic tile currently has high toxicity to aquatic organisms and manufacturing costs are quite expensive. Polystyrene and graphite as doping material have potential to be applied as an acoustic waves absorbent. In this study, graphite and polystyrene were made as acoustic absorbent acoustic wave composite material. The research begins with the stage of optimizing the percentage of matrix, filler, and thinner with sound absorption intensity parameters at frequencies of 50 Hz-6000 Hz with matrix results: filler: thinner at 79%: 6% 15%. The composite was then characterized by SEM-EDX at a magnification of 150× to 5000 × and calculated the value of its density. Mechanical test is also done by a compressive test with an optimum composite of 60G/40PS of 0.65 MPa. Test for salinity resistance in a solution of 3.5%wt NaCl and 3.5% MgCl2 for 120 hours and obtain optimum results at 80G/20PS. Tests for the absorption of acoustic waves were tested in the frequency range 50 Hz-6300 Hz using an impedance tube with an optimum composition of 0G/100PS.