飞机复材结构的修理容限确定方法

Determination of repair tolerance for aircraft composite structure

针对民用飞机复材结构修理实践中要不要修理、能不能修理等维修决策问题,考虑损伤的发生次序、发生时间、损伤尺寸、损伤检测概率、超载分布、维修策略、强度退化与恢复等因素,以失效概率为安全性约束条件,以维修成本为经济性优化目标,提出了一种基于用蒙特卡罗仿真的飞机复材结构修理容限确定方法.案例研究结果表明:得到的修理容限及对应的检查间隔可以更加使航空公司更加经济地决策维修活动,而且能够主动控制飞机复材结构的安全性和可靠性水平,为飞机复材结构在寿命周期内的安全性和经济性分析以及损伤维修阈值决策提供了一种具有工程意义的技术方法.

Aiming at the maintenance decision-making issues on"when to repair"and"when to replace"for civil aircraft composite structure in the practice of maintenance,a repair tolerance determination is proposed using Monte Carlo simulation method,in which a few factors of the damage forming sequence,occurrence time,size,detection probability,overload distribution,maintenance policy,and strength degradation and recovering are taken into account and failure probability is regarded as safety constraint condition and maintenance cost is treated as economy optimization objective.A case result shows that the repair tolerance and inspection interval due to the approach can make decisions of the maintenance activities more economically and control the safety and reliability level of aircraft composite structure actively.It should provide a practical significance technique about composite structure safety and economy analysis and damage maintenance threshold decision-making in the life cycles for airline operators.