Research on a smoothing method for engine removal rate

Considering the characteristics of condition based on maintenance policy,a mixed integer nonlinear programming model for the cost of aero-engine fleet was formulated.At the same time,a new method was proposed to smooth the engine removal rate named shifted shortest procession time(SSPT) algorithm,which was compared with other three algorithms by using the data of CF6 engine as an example for the case study.The results show that the scheduling made by SSPT algorithm can gain lowest cost,highest support level,lower average removal rate and better effect of peek smoothing.