144
Simpson & Keats
1 10 100 1000 ARL (log scal*)
Figurę 4. Example 2 for Shift = 0.25.
0 5 10 te 20 25 30 35 40 45
ARL
Figurę 5. Example 2 for Shift = 1.25.
The ARL improvements we have discussed are representative of the types of improvements that can be madę within a few percent of the minimum economic cost per cycle. The figures displayed many options within about five percent of minimum cost. Greater improvements can be madę in both types of ARL but at some point the response surface becomes steep and costs increase substantially. Figurę 6 shows the relationship between costs and the two ARL