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이진형(JinHyung Lee),이종헌(JongHeon Lee),이호달(HoDal Lee),김이태(YTae Kim),성창모(Changmo Seong),박장석(JangSeok Park) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
A manufacturing process for applying spray-type poly-urethane material is developed for dash isolation pad’s heavy layer. With the manufacturing process, thickness of heavy layer of dash isolation pad could be varied locally. In this study, the sound insulation performance of the material had been studied in the material level. The weak areas of engine-noise transmission were found experimentally for a target vehicle. By increasing heavy layer’s thickness at the noise-transmission weak areas and decreasing the thickness at the non-weak areas, the noise-transmission was refined and the total weight was also reduced. It is expected that the developed material and manufacturing process could contribute to weight and cost reduction of sound packages.