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Noise refinement in commercial vehicles has advanced in the recent times. With the advent of high capacity engines and strict regulations more emphasis is laid on noise refinement. Active noise cancellation, acoustic material development etc. are some of the techniques resorted to for noise refinement. This work relates to the latter; development of acoustic material for noise refinement. Polyurethane foams (PU) are widely used as sound absorbing material in commercial vehicles. They are used for under hood application and cabin noise reduction. PU is widely used for absorbing sound in mid and high frequency range but relatively weak in low frequency range. PU foam with greater thickness are needed to achieve good sound absorption at low frequency range which in turn results in larger space consumption and higher cost. Current work is aimed at developing flexible PU foam material to get good sound absorption property at low frequency range (100-200 Hz) without compromising on the high frequency characteristics. Experiments have been carried out in preparing PU foam with two types of fillers namely crumb rubber and coconut fiber for varying load fraction. The foam samples were characterized for thermal, mechanical, morphological and sound absorption characteristics. The PU foam with fillers showed good sound absorption capacity in low and mid frequency range without any compromise on the high frequency performance.
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