Cost‐optimal maintenance policies with increasing hazard rate

Considers a system with two states ‐ operating and failed. The system undergoes overhauls preventively at scheduled times and the successive overhaul times constitute non‐decreasing geometric process. Assumes that the failure rate increases with the number of overhauls. Also assumes that the system undergoes only minimal repairs if it fails between optimal number of overhauls N*, the optimal time T* and the optimal pair (N*, T*) based on the cost considerations. Gives numerical examples to illustrate the procedure.