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應急救援物資車輛運輸路線多目標優化

Multi-objective route optimization of transporting emergency goods and materials for rescue

  • 摘要: 運用運籌學中圖論及多目標優化的理論和方法建立應急救援物資車輛最佳運輸路線的選擇模型,并基于啟發式算法求解該模型.從靜態網絡應急物資車輛運輸路線的雙目標優化問題入手,設計適合本文模型的算法,并將之推廣至含有三個及三個以上優化目標的路線選擇問題.引入時間擴展圖的概念,將動態網絡中的最佳運輸路線問題轉化為靜態網絡中的路徑選擇問題.算法實質是通過構造輔助決策函數實現Dijstra算法的調用,并在輔助函數構成的搜索空間上尋找最優解,是一種快速的、近似的算法.利用隨機路網和真實路網測試本文算法,測試結果與本文的理論分析一致,證明本文算法在應急救援物資車輛運輸路線的多目標優化問題中可行且有較好的應用效果.

     

    Abstract: A mathematical model of the optimum route for transporting goods and materials during a disaster period was built by using the graph theory and multi-objective optimization method. For the simple case of a dual-objective optimization, an approximate and fast algorithm was proposed based on the heuristic algorithm and then we extended the promotion to other transportation route optimization problems, which contain 3 and more than 3 optimization goals. The dynamic network routing problem was transferred into a static network routing problem by introducing the time-expanded graph in dynamic network flow analysis, which can provide an appropriate method for selecting the optimum route of transporting emergency goods and materials. The purposes of the algorithm are to call Dijstra algorithm to calculate the model by constructing several decision support functions and to find the optimal solution in the search space constituted by the auxiliary functions, so the algorithm is a fast and approximate algorithm. The algorithm was tested in a random road network and a real road network, and the results are consistent with theoretical analysis in the text. The test results show that the algorithm has a better effect in solving the multi-objective route optimization problem of transporting emergency goods and materials and its solution efficiency is higher.

     

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