Topology optimization design and mechanical property analysis of the transverse bulkhead of a trimaran

To reduce the structural mass of a trimaran, improve its performance, and ensure that its bulkhead has sufficient structural strength after the mass of the bulkhead is reduced, seven cases are designed to check the strength of the trimaran bulkhead based on the Rules for The Classification of Trimarans. The variable-density topology optimization method is applied to calculate the stress distribution of the trimaran bulkhead structure under different working conditions. The results of the calculation and optimization show that there is no positive correlation between the maximum stress of the optimized bulkhead structure and the volume reduction ratio under different volume constraints. Under the premise of ensuring safety of the structure, the optimization can reduce 50% of the structure weight in the optimization area of the bulkhead and realize the lightweight design of the non-watertight bulkhead structure. Compared with the design of real ship bulkheads, the distribution of connecting materials of optimized bulkheads is similar to that of the stiffeners of real ship bulkheads. Under special working conditions, the strength of the bulkhead structure with stiffeners arranged according to the optimization results is better. Thus, topology optimization can provide guidance for the reinforcement arrangement of bulkhead structure under specific working conditions. © 2020, Editorial Department of Journal of HEU. All right reserved.