FEM解析に基づく船用パルプ軽量化の研究

概要

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The standard rules of JIS for Marine gate valves are faced to be replaced with new ISO rules. The main deference between these rules is the flange distance which is required to be shorter in ISO rules. The new distance might make their stiffness low. If such change is introduced, it will lead to redesign almost all marine valves. And it is also anticipated to need much time for their redesign. Until now, the simplified calculation method has been used to design marine valves. It is difficult, however, to design more precisely those valves by this simple method. So the possibility to design them by a computer using a FEM program for the weight reduction was surveyed. The displacement and the stress of marine gate valves were analyzed by FEM, and the effects of a circumferential rib and vertical ribs were investigated. And the effect of bonnet flange on the displacement was also investigated. Finally, the effect of the wall thickness of the body on the weight reduction was examined. The conclusions obtained from above FEM analysis are as follows; (1) Partical change of the wall thickness is effective not to lower the wall strength, and a circumferential rib is effective to keep displacements small. (2) The body weight can be reduced about 10 % by thinning wall thickness.
独立行政法人海上技術安全研究所の論文
1992-01-30