Abstract
In this paper, the sound transmission loss (STL) and equivalent continuous sound pressure level (Leq) of the polypropylene/glass fiber reinforced material has been measured experimentally. The objective of the present work is to measure the sound absorption properties of the polypropylene/glass fiber reinforced composite material for various real case disturbances. The real case disturbances are harmonic sound (one-third octave band frequencies), road traffic noise, ambulance siren noise, train noise, aircraft noise, construction and machinery noise. The acoustical behavior of the composite material is then compared with the neat polypropylene and with window glass, termed as a single glass. The diameter and the thickness of the composite specimens are 152 mm and 4 mm respectively. The acoustical behavior of the composite material is experimentally measured at different fiber volume fractions. The fiber volume fraction (Vf) used in the present work is 10%, 20%, and 30%. Also, the fiber orientation, ranges from 0° to 90°, considers an important factor on the acoustical behavior of the composite material. The results are also compared with the two glasses separated with an air, termed as a double glass.
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