第四章 數值測試與驗證結果
4.3 參數之敏感度分析
4.3.2 母體大小分析
綜合以上分析,本研究以MJS 大小為 n=100、突變率設定為 3%為例,再分別 比較母體大小為 10、18、25、32、40,分析執行所需花費的時間及誤差大小;結 果可發現當母體大小愈大時,其求解時間愈長,但求解品質則呈現愈佳的情況,
因此將母體大小設定為 25 時,即 n/4 時,既可可在合理的時間(一分鐘內)求得出 較佳的解,其求解品質亦在可接受的範圍內,如圖4-5 及表 4-6。
0 10 20 30 40 50
10 18 25 32 40
Population size
Average Elapsed Time(sec)
0.0%
0.2%
0.4%
0.6%
0.8%
1.0%
1.2%
1.4%
Average Error(%)
Average Elapsed Time(sec) Average Error(%)
圖 4- 6 Population Size vs. Elapsed Time & Error 表 4- 11 母體大小對誤差值及求解時間的影響
Population size 10 18 25 32 40 Error 1.21% 0.79% 0.45% 0.24% 0.11%
Elapsed time(sec) 2 8 14 23 44
第五章 結論與建議
加工機台為2 台的條件下,以 ES 為派車法則(dispatching policy),發展出一以最小 化生產週期,也就是最大化其有效產出(throughput)為目標的數學模式。實務上,
本研究所研究的議題,以排程的表示方法為:AGV1,lp2|k≧2,es| Ct。即在 AGV1 台,加工機台 2 台,工件種類 k 假設為 20 種,另外,MJS 的大小為 0~100,
派車策略採ES,來最小化 MJS 的 CT。由於工件在各機台的加工時間為已知條件,
即加工時分別為a1,…,a20,b1,…,b20。藉由均勻分佈的方式隨機產生20 組工 件的加工時間,分別介於30(min)~300(min)的數值
有關演算法參數的設計,本研究將母體大小設訂為 n/4、突變率為 3%,對於
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附錄、20 組測試問題
第五組加工時間:
第九組加工時間:
第十三組加工時間:
第十七組加工時間:
簡 歷
姓名:游展宗 籍貫:宜蘭縣
信箱:[email protected] 學歷:
民國95 年 9 月至民國 97 年 6 月 國立交通大學運輸科技與管理學系碩士班畢業 民國85 年 9 月至民國 89 年 6 月 國立交通大學運輸工程與管理學系畢業