损伤容限结构的最优维护策略

 本文以结构损伤容限分析和可靠性评估为基础,应用动态序列规划技术,并考虑到结构的检测费用、修复费用和可能失效损失的相互关系,建立了计算结构在剩余寿命期内的期望维护费用与期望损失之和的序列递推数学模型,进而提出了以总期望维护费用与总期望损失之和最小化来抉择航空结构最优维护策略的原则和步骤。

OPTIMAL MAINTENANCE PROGRAM OF DAMAGE TOLERANCE STRUCTURE

This paper introduces simply the basic conception and method of structure damage tolerance analysis and damage tolerance structure reliability assessment.The possible damage and failure states of the damage tolerance structure are defined, and the possible loss caused by each state is analysed. Because structure maintenance cost includes both inspection cost and repairing cost mainly, the paper explores the relationship between the structure maintenance cost and the structure damage loss,through analysing that the structure maintenance program has an influence on the mutual transfer of the structurte damage and failure states. On the basis of which are presented above, the series mathematical models to calculate the sum of the expected cost and the expected loss in the period of the remainder of structure life are developed. Further, the mathematical formula is advanced to compute the sum of all the expected cost and the expected loss in the designed economic life period of the damage tolerance structure when some maintenance program is taken. The criterion to make the sum of all the expected cost and the expected loss minimized is proposed, which is applied to optimize the structure maintenance program, and the approach to select the optimal structure maintenance program is presented by using dynamic programming. One example optimizing the maintenance program of some item of aircraft structure is also given.