Developing an Inspection Optimization Model Based on the Delay-Time Concept

Table 2

Results summary for numerical examples.

ROCOD function from	Periodic schedule		Optimized aperiodic schedule
	Total downtime ratio (%)	Downtime during lifetime (month)	Total downtime ratio (%)	Improvement in downtime ratio (%)	Reduction in downtime (month)
Linear	7.99	19.6	7.61	0.38	0.92
Quadratic	13.91	34.4	12.04	1.87	4.6
Expon’l	20.66	51.6	16.53	4.13	10.1