Question 1
A machine must process four products (P3, P2, P4, P1) to minimize total time.
Processing times: P3: 40, P2: 30, P4: 43, P1: 79
Setup times:
| From ↓ / To → | P3 | P2 | P4 | P1 |
| P3 | 0 | 18 | 15 | 13 |
| P2 | 21 | 0 | 38 | 38 |
| P4 | 25 | 25 | 0 | 33 |
| P1 | 34 | 16 | 33 | 0 |
What sequence minimizes total time?
Optimal sequence examined for all 24 permutations.
Minimum time: 244 minutes. Sequence: P1 - P2 - P3 - P4.
Calculation: P1 → P2 → P3 → P4.
Time: PT(P1) + (ST(P1→P2) + PT(P2)) + ...
Minimum time: 244 minutes. Sequence: P1 - P2 - P3 - P4.
Calculation: P1 → P2 → P3 → P4.
Time: PT(P1) + (ST(P1→P2) + PT(P2)) + ...