Structural Analysis and Optimum Design of the Greenhouse with lastic Cover

• Main Authors: Wu Ming Dong, 吳明東
• Other Authors: Lin Tshen Chan
• Format: Others
• Language: zh-TW
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/77396869895017515048

碩士 === 國立中興大學 === 農業機械工程學系 === 83 === The greenhouse with plastic cover used in Taiwan are still not well-developed. The structure of the greenhouse has not been analyzed. Therefore, the structure is either too weak to be dangous, or too strong to be wasteful. In this study, the greenhouse with plastic cover was analyzed by using the finite element method first. The optimum design of the structure wasndertaken thereafter. In structural analysis aspect, the finite element model of greenhouse structure has been established in this study. The finite element analysis package, MSC/NASTRAN, was used. The structure subjected to wind force with various velocities was investigated. In optimum design aspect, this study integrates the optimum design package, MOST, and the finite element analysis package, MSC/ NASTRAN, by an interface program coded by C language. By using the discrete design variables optimization module provided by MOST, this study had obtained new designs of the structure of greenhouse. Under the loading condition that the wind velocity is 32.7m/sec, the total weight of the structure is reduced about 43.37%. Furthermore, under the loading condition that the wind velocity is 51.0m/sec, the total weight of the structure is reduced about 12.66%. In addition, all members in new design of structures hold safety factors to be over 2.