Research Article

Joint Economic Design of CUSUM Control Chart and Age-Based Imperfect Preventive Maintenance Policy

Table 1

The nomenclature.

Nomenclatureā€‰

The age of the machine for maintenance
The number of age-based maintenances
Sample size
The jth sampling interval in the kth phase
The decision interval coefficient of CUSUM chart
The reference value coefficient of CUSUM chart
Probability of type I error
Probability of type II error
Average time of an PM
Average time of a replacement
Fixed cost of each sampling
Average variable cost per unit
Average cost of a compensatory maintenance
Average cost of a CM
Average cost of a PM
Average cost of a replacement
The expected quality control cost in the cycle
The expected PM cost in the cycle
The expected cycle time
The expected quality control cost in the kth phase
The expected PM cost in the kth phase
The expected phase time of the kth phase
The expected cost per unit time in the cycle