Design of bulkhead reinforcement of trimaran based on topological optimization

Abstract

A design method of bulkhead reinforcement of trimaran based on topological optimization is proposed, which can reduce the mass of bulkhead and reinforcement as much as possible while ensuring that bulkhead has sufficient structural strength. Based on Rules for The Classification of Trimarans, seven structural strength checking conditions are designed. Stress distribution of trimaran bulkhead structure and reinforcement before and after optimization under different conditions are calculated by using finite element method and variable density topology optimization method. The results show that: The maximum stress distribution area of bulkhead and reinforcement occurs near the connecting bridge and the large opening. When the volume constraints are changed, the stress distribution and maximum stress of the optimized bulkhead and reinforcement will change accordingly. There is no positive correlation between the maximum stress and the volume reduction ratio of reinforcement. The maximum bulkhead stress cannot be reduced by increasing the volume retention ratio of the reinforcement. The distribution of the optimized reinforcement is similar to that of the real bulkhead. On the premise that the bulkhead has sufficient structural strength, the lightweight design of trimaran structure can be realized based on the topological optimization method.