Research Article
A Multiobjective Optimization Algorithm to Solve the Part Feeding Problem in Mixed-Model Assembly Lines
Table 8
Results from heuristic and CPLEX for the solved instances.
| Sample | | NT | | SA-based heuristic | CPLEX | NT | AIL | PR-AIL (%)a | | CPU (s) | NT | AIL | | CPU (s) |
| 1 | 110 | 24 | 350 | 23 | 0.515 | 0.000 | 0.089 | 2.476 | 23 | 0.515 | 0.089 | 7200 | 23 | 350 | 22 | 0.573* | 0.348 | 0.080 | 2.548 | 22 | 0.575 | 0.080 | 7200 | 20 | 350 | 20 | 0.413* | 0.242 | 0.056* | 2.047 | 20 | 0.414 | 0.057 | 7200 |
| 2 | 95 | 24 | 300 | 23 | 0.542 | 0.000 | 0.089 | 2.277 | 23 | 0.542 | 0.089 | 7200 | 23 | 300 | 22 | 0.588 | 0.000 | 0.076 | 2.264 | 22 | 0.588 | 0.076 | 7200 | 19 | 350 | 19 | 0.438 | 0.000 | 0.047 | 1.775 | 19 | 0.438 | 0.047 | 7200 |
| 3 | 75 | 24 | 250 | 18* | 1.255 | — | 0.124 | 1.815 | 19 | 1.115 | 0.146 | 7200 | 22 | 250 | 20 | 0.776 | 0.000 | 0.104 | 1.744 | 20 | 0.776 | 0.104 | 7200 | 17 | 300 | 17 | 0.458 | 0.000 | 0.046 | 1.128 | 17 | 0.458 | 0.046 | 34.937 |
| 4 | 60 | 24 | 150 | 17 | 1.482 | −2.845 | 0.112 | 4.562 | 17 | 1.441 | 0.084 | 7200 | 15 | 200 | 15 | 0.398 | 0.000 | 0.058 | 0.748 | 15 | 0.398 | 0.058 | 4.507 | 13 | 250 | 13 | 0.415 | 0.000 | 0.053 | 0.562 | 13 | 0.415 | 0.053 | 2.062 |
| 5 | 50 | 22 | 150 | 16 | 1.515 | −5.722 | 0.921 | 2.147 | 16 | 1.433 | 0.067 | 7200 | 16 | 200 | 16 | 0.433 | 0.000 | 0.058 | 0.916 | 16 | 0.433 | 0.058 | 4.084 | 11 | 250 | 11 | 0.409 | 0.000 | 0.041 | 0.449 | 11 | 0.409 | 0.041 | 1.928 |
| 6 | 40 | 23 | 100 | 17* | 1.986 | — | 0.117 | 9.748 | 18 | 1.125 | 0.101 | 7200 | 15 | 150 | 15 | 0.385 | 0.000 | 0.059 | 0.557 | 15 | 0.385 | 0.059 | 2.097 | 12 | 200 | 12 | 0.375 | 0.000 | 0.054 | 0.429 | 12 | 0.375 | 0.054 | 1.281 |
| 7 | 30 | 19 | 100 | 12 | 0.983 | −0.614 | 0.220 | 0.509 | 12 | 0.977 | 0.220 | 15.786 | 17 | 100 | 16 | 0.515 | 0.000 | 0.107 | 0.470 | 16 | 0.515 | 0.107 | 87.166 | 15 | 100 | 15 | 0.406 | 0.000 | 0.072 | 0.498 | 15 | 0.406 | 0.072 | 1.303 |
| 8 | 20 | 21 | 50 | 13 | 1.216 | 0.000 | 0.088 | 0.421 | 13 | 1.216 | 0.088 | 27.511 | 16 | 50 | 13 | 1.126 | 0.000 | 0.069 | 0.961 | 13 | 1.126 | 0.069 | 5.943 | 11 | 100 | 11 | 0.386 | 0.000 | 0.057 | 0.211 | 11 | 0.386 | 0.057 | 0.633 |
| 9 | 10 | 15 | 50 | 8 | 1.380 | 0.000 | 0.122 | 0.185 | 8 | 1.380 | 0.122 | 2.019 | 11 | 50 | 10 | 0.672 | 0.000 | 0.119 | 0.182 | 10 | 0.672 | 0.119 | 0.783 | 8 | 50 | 8 | 0.343 | 0.000 | 0.056 | 0.101 | 8 | 0.343 | 0.056 | 0.208 |
| Case 1 | 26 | 15 | 100 | 13 | 0.484 | 0.000 | 0.169 | 0.121 | 13 | 0.484 | 0.169 | 2.076 | Case 2 | 23 | 15 | 100 | 15 | 0.339 | 0.000 | 0.077 | 0.108 | 15 | 0.339 | 0.077 | 1.574 |
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Percentage error (PR) of the heuristic algorithm from CPLEX for the average inventory level (AIL).
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