Research Article
Performance Comparison of Real-Time Yard Crane Dispatching Strategies at Nontransshipment Container Terminals
Table 3
Experimental results of four YC dispatching strategies under two stacking strategies with two vessel schedules.
| Vessel calls | Stacking strategy | YC dispatching strategy | | GCR | | | | | | | | | | | | (¥) | (lifts/h) | (min) | (min) | (min) | (min) | (times) | (min) | (min) | (min) | (min) | (min) | (min) |
| More (36) | Separate stacking | Nearest truck | 119.75 | 35.70 | 1.52 | 0.04 | 2.20 | 0.65 | 385 | 2.83 | 5.02 | 6.02 | 3.38 | 2.87 | 13.91 | Earliest truck | 128.83 | 36.02 | 1.53 | 0.02 | 2.20 | 0.76 | 370 | 2.83 | 5.15 | 5.86 | 3.38 | 3.69 | 14.70 | Nearest YT | 123.19 | 36.44 | 1.51 | 0.02 | 2.20 | 0.66 | 390 | 2.83 | 4.38 | 6.45 | 3.38 | 4.08 | 14.91 | Earliest YT | 129.07 | 36.66 | 1.51 | 0.02 | 2.20 | 0.74 | 380 | 2.83 | 4.40 | 6.39 | 3.38 | 4.53 | 15.32 | Scattered stacking | Nearest truck | 119.35 | 33.78 | 1.57 | 0.06 | 2.21 | 0.62 | - | 2.83 | 6.34 | 5.24 | 3.38 | 3.09 | 14.67 | Earliest truck | 130.10 | 33.84 | 1.61 | 0.02 | 2.21 | 0.75 | - | 2.82 | 6.46 | 5.24 | 3.38 | 3.95 | 15.65 | Nearest YT | 123.61 | 35.41 | 1.53 | 0.04 | 2.21 | 0.64 | - | 2.83 | 5.32 | 5.78 | 3.38 | 4.81 | 15.91 | Earliest YT | 130.09 | 35.43 | 1.54 | 0.02 | 2.21 | 0.73 | - | 2.82 | 5.21 | 5.90 | 3.38 | 5.15 | 16.26 |
| Less (24) | Separate stacking | Nearest truck | 113.37 | 36.50 | 1.51 | 0.03 | 2.21 | 0.61 | 190 | 2.83 | 3.92 | 6.86 | 3.38 | 1.60 | 12.38 | Earliest truck | 119.20 | 36.86 | 1.51 | 0.02 | 2.21 | 0.69 | 185 | 2.83 | 3.98 | 6.78 | 3.38 | 2.10 | 12.85 | Nearest YT | 114.57 | 37.09 | 1.50 | 0.01 | 2.21 | 0.63 | 165 | 2.83 | 3.40 | 7.24 | 3.38 | 1.90 | 12.54 | Earliest YT | 116.92 | 36.92 | 1.50 | 0.02 | 2.21 | 0.66 | 160 | 2.84 | 3.56 | 7.11 | 3.38 | 2.08 | 12.75 | Scattered stacking | Nearest truck | 113.50 | 35.67 | 1.52 | 0.03 | 2.22 | 0.60 | - | 2.82 | 4.89 | 6.17 | 3.38 | 1.82 | 12.88 | Earliest truck | 117.90 | 35.82 | 1.53 | 0.01 | 2.22 | 0.67 | - | 2.83 | 4.75 | 6.26 | 3.38 | 1.97 | 12.97 | Nearest YT | 114.99 | 36.61 | 1.51 | 0.02 | 2.22 | 0.62 | - | 2.83 | 4.26 | 6.55 | 3.38 | 2.31 | 13.11 | Earliest YT | 117.66 | 36.50 | 1.52 | 0.01 | 2.22 | 0.66 | - | 2.82 | 4.18 | 6.64 | 3.38 | 2.35 | 13.17 |
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GCR: gross crane rate (the total number of QC lifts made/the total number of QC hours beside a busy berth).
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