Abstract
Sound-absorbing inner-roof which is made of PET (Poly Ethylene Terephthalate) fiber has been developed by the authors. Sound-absorbing inner-roof is polyester fiber board, so it is harmless and recycable. First of all, we explain tractor cabin structure and double roof ceiling. Secondly, we investigate the Sound-absorbing characteristics of the polyester fiber board with backward air layer, because the ceiling of tractor cabin consists of double roofs in which the air conditioning parts are installed and space is exists. As a result, the calculation of Sound-absorbing characteristics coincide with measurement result, and it becomes clear that the sound-absorbing characteristics of the polyester fiber board is better than that of polyurethane foam. Finally, we adapt the polyester fiber board to the inner-roof of the tractor cabin. Then we confirmed that the polyester fiber board reduces the sound level 2.4 dB, especially, 6 dB at 1/3 octave band of 500 Hz.
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