In the agriculture of strawberry cultivation, it is necessary to loosening and breaking up of the intertwined coco peat and strawberry root in order to cultivate strawberry again. The main objective of this study is to design and analyze the structure of strawberry rotary device for using breaking up of coco peat and strawberry root. In order to perform crushing coco peat on the bed, the rotary device was designed under the weigh 20kg with the speed 11.75m/min, and it can operate on bed width from 250~310mm. Due to different depth of bed, the body of device also was designed screw holder to adjust the hight from 0~120mm. To evaluate the safety of structure, body device was analyzed in static and free vibration state by using Abaqus program. The device was applied maximum load 1177.2N, and the maximum equivalent stress was reached 41.9MPa. The free vibration analysis of two rotating cutter showed minimum natural frequency mode 338.58Hz and 339.9Hz. The results indicate that the designed rotary device was satisfied and has enough strength under design and simulation conditions.

ABSTRACT
1. 서 론
2. 로터리 설계
3. 구조해석
    3.1 유한요소 및 경계조건 분석
    3.2 정적 구조 해석
4. 제작 및 시험평가
5. 결 론
References

• 오성훈(Chonbuk National University, Dept. Mechanical system engineering) | S. H Oh Corresponding Author
• 이정환(Chon-buk National University) | J. H. Lee
• 유승현(Graduate school of Chon-buk National University) | S. H. You
• 하이 소팔(Graduate school of Chon-buk National University) | S. Hai