民用飞机结构非计划直接维修成本预计研究

Study on Unscheduled Direct Maintenance Cost of Civil Aircraft Structure

民用飞机结构非计划直接维修成本在设计阶段难以预计。介绍DMC构成要素及影响因素,建立DMC预计流程、预计模型及预计调整模型;以前中机身上蒙皮壁板为例,基于工程设计输入及统计报告,计算来自MSG-3,DTA,DSEA的非计划维修任务DMC数值,对比并分析金属及复合材料非计划DMC预计结果。结果表明:该预计方法可行,反映预计模型准确性,金属结构环境退化及疲劳损伤是影响该结构DMC的主要因素,复合材料的使用可显著降低飞机结构非计划DMC。

To solve the problem of the unscheduled direct maintenance cost of civil aircraft structure is difficult to predict in the design phase.The elements and influence factors of DMC are introduced,and the prediction flow,model and adjustment model are established.Based on engineering design inputs and statistical reports,an example about a skin panel of forward-mid fuselage is presented.A series of DMC values of the maintenance tasks from MSG-3,DTA and DSEA analysis are computed,and the various DMC prediction results for metal and composite skin panel are compared and analyzed.The feasibility of the prediction method is verified,and the accuracy of the prediction model is reflected.It is shown that environment damage(ED)and fatigue damage(FD)are the main factors affecting the DMC of the metal structure,and the application of composite materials can significantly reduce the unscheduled DMC.