In this technology development, we have developed an automation system after developing a material rotation mixing process so that the manual process of sound absorbing materials can be supplied in quantities. After setting up 5kgf supply of the fused acoustic material, the setting value of 5kg was automatically supplied to the molded frame to reach the quantification supply. In the process of producing noise goods between floors, the automatic compression system was developed, which was a manual operation of three persons, and the production of one person was allowed, and the production of 200 sound absorbers per day, It has improved to 450. Quantitative supply unit was developed to reach 50.7mm for target 50±3mm based on the sound absorption product thickness indication, reducing the defect rate to less.

선박의 거주구는 엔진 등 동력원과 거주구 주변의 각종 팬 & 모터에서 발생하는 소음 및 진동이 직접적으로 영향을 미치게 된다. 최근 선원의 근무구조 개선을 위해 국제해사기구에서 2014년 7월 이후 계약된 선박부터 소음규정을 강화하여 강제적용 하도록 하였다. 이 연구에서는 강화된 소음 규정을 만족 할 수 있도록 흡음재 설치에 따른 소음저감 효과에 대해 고찰하였다.

In this study, development of new sound absorbent which is safety, economical and efficient with using recycled materials is tried for substitution of commercial sound absorbent. The sound absorbents, used in this investigation, were made of used paper or filters of cigarette butts. With the variation of the material densities,, sound absorptions of materials were measured. The impedance tube method is used for measuring sound absorption coefficient of the new sound absorbent materials. The measured frequency range was 250㎐ to 4000㎐ in 1/3 octave band . The sound absorption coefficient of the commercial materials and that of the materials synthesized in the our laboratory show almost same value.