论文部分内容阅读
针对飞机结构腐蚀损伤分析和评价过程中影响因素复杂且具有模糊性的问题,提出了基于故障树分析和模糊理论的方法对飞机结构在复杂环境下发生的腐蚀损伤进行综合评判.对飞机结构腐蚀损伤过程和机理进行分析,构建飞机结构腐蚀损伤故障树,建立腐蚀损伤影响因素的评判集;计算各评判因素的相对概率重要度,根据评判因素相对概率重要度的比重,建立评判因素权重集;确定飞机结构腐蚀损伤的评价集,建立从评判因素集到评价集的模糊映射;通过模糊关系的模糊变换,对服役环境引起飞机结构的腐蚀损伤进行定量评价.通过飞机铝合金结构和不锈钢结构在沿海环境条件下腐蚀损伤评判的实例分析,证明了该方法的有效性,可为飞机结构设计和维修提供依据.
Aiming at the complex and ambiguous influencing factors in the process of aircraft structural damage analysis and evaluation, a method of fault tree analysis and fuzzy theory is proposed to evaluate the corrosion damage of aircraft structure in complex environment. The damage process and mechanism are analyzed, the fault tree of the damage structure of the aircraft structure is built, and the judgment set of the influencing factors of corrosion damage is established. The relative probability importance of each factor is calculated, and the weighting set of the factors is established according to the proportion of the relative probability importance. The fuzzy mapping of the aircraft structure damage evaluation was established and the fuzzy mapping was established from the evaluation factor set to the evaluation set.Fuzzy transformation of the fuzzy relation was used to quantitatively evaluate the corrosive damage of the aircraft structure caused by the service environment.By the aircraft aluminum alloy structure and stainless steel structure The case analysis of corrosion damage assessment under coastal environmental conditions proves that the method is effective and can provide the basis for aircraft structure design and maintenance.