基于风险的船体结构腐蚀优化检测及维修规划

提出了基于风险的船体结构腐蚀检测及维修的优化模型．最优的检测及维修是在保证结构在设计工作寿命期内的可靠指标大于最低可靠指标的基础上，使得结构生命周期内总的期望费用最小．建立了检测、维修及失效事件的安全余量方程．在此基础上，以受点腐蚀损伤的船体构件为例，分析了基于风险的最优检测及维修策略的制定过程．结果表明，最优的检测是在结构的可靠指标低于最低可靠指标前就对结构进行检测．基于风险的优化检测及维修方法能够在风险与成本之间达到一种平衡，它在选择最优的检测及维修策略时是有效的．

Risk Based Inspection and Repair Optimization of Ship Structures Considering Corrosion Effects

An optimization model of risk based optimal inspection and repair planning was proposed for the ship structures subjected to corrosion deterioration. The planning problem was formulated as an optimization problem where the expected life costs were minimized with a constraint on the minimum acceptable reliability index. The safety margins were estabilished for the inspection events, the repair events and the failure events for ship structures. Based on them, a component subjected to pitting corrosion was investigated to illustrate the process of selecting the optimal inspection and repair strategy. The results show that the optimal inspection instants should take place before the reliability index reaches the minimum acceptable reliability index. A balance can be achieved between the risk cost and total expected inspection and repair costs by using the risk based optimal inspection and repair method, which is very effective in selecting the optimal inspection and repair strategy.