民用航空发动机在翼时间控制方法

为了通过视情维修策略控制民航发动机在翼时间,分析了发动机维修与在翼时间的特点,建立了反映在翼时间与状态监测变量和故障强度之间关系的比例强度模型,确立了性能衰退下的在翼时间控制限与单位时间总成本期望值最小时的最优预防性维修间隔,并进行了CF6-80C2A5型发动机运营数据的实例验证。结果表明:故障强度小,则在翼时间控制限低;预防性维修与事后维修成本率会影响最优预防性维修间隔;完备的发动机拆换与在翼历史记录、维修成本、适航与制造商要求、寿命件限制等数据是提高在翼时间控制准确性的关键。

Control method of time on wing for civil aeroengine

In order to apply condition based maintenance (CBM) to control civil aeroengine time on wing (TOW), the features of aeroengine CBM and TOW were discussed, and the proportional intensity model was established to describe the relation among TOW, condition monitoring variables and failure intensity. TOW control limit due to performance deterioration and optimal preventive maintenance (PM) interval under minimizing expected total maintenance cost per unit time were implemented. The operation data of a CF6-80C2A5 engine were studied. It is pointed that the less failure intensity is, the lower TOW control limit is; moreover, the cost rate between PM and corrective maintenance can affect optimal PM interval; sufficient engine operation data are the keys of accurate TOW control, such as engine removal and on wing history records, maintenance cost, requirements of airworthiness and manufacturer, and time limits of life limited parts etc. 3 tabs, 4 figs, 14 refs.