The contributions of this paper are as follows.
(i) Taking account of the random and time-varying characters of traffic conditions, a robust optimization based method is applied in the proposed model, which is able to compute the stochastic timedependent optimal paths (STDOP) connecting any pair of customer nodes efficiently. Being different from many existing approaches, the robust approach does not require the probability distributions of link travel times and only takes the range of uncertainty which can be derived from historical data and experience of the decision-makers.
(ii) The STDVRP model we proposed here can be converted into a time-dependent VRP (TDVRP). The simplified problem will not lead to an increase in the computing time and can be solved efficiently by conventional algorithms. The proposed model is capable of addressing STDVRPTW of practical sizes on a real-world urban network, demonstrated here on the road network of Shenzhen, China, with computational instances of up to 150 customers.
(iii) The model we proposed can improve the level of customer service by guaranteeing the time-window constraint satisfied without leading to cost increase or environmental impacts. The improvement can be significant especially for large-scale network delivery tasks.
The rest of paper is organized as follows. In Section 2, a literature review is given on both VRP and optimal path problem in STD networks. In Section 3, the STD network is defined and the model of STDVRPTW is formulated. In Section 4, a routing construction algorithm is presented. Computational instance and analysis are shown in Section 5. In Section 6, conclusions are made and future directions are given.
The contributions of this paper are as follows.(i) Taking account of the random and time-varying characters of traffic conditions, a robust optimization based method is applied in the proposed model, which is able to compute the stochastic timedependent optimal paths (STDOP) connecting any pair of customer nodes efficiently. Being different from many existing approaches, the robust approach does not require the probability distributions of link travel times and only takes the range of uncertainty which can be derived from historical data and experience of the decision-makers.(ii) The STDVRP model we proposed here can be converted into a time-dependent VRP (TDVRP). The simplified problem will not lead to an increase in the computing time and can be solved efficiently by conventional algorithms. The proposed model is capable of addressing STDVRPTW of practical sizes on a real-world urban network, demonstrated here on the road network of Shenzhen, China, with computational instances of up to 150 customers.(iii) The model we proposed can improve the level of customer service by guaranteeing the time-window constraint satisfied without leading to cost increase or environmental impacts. The improvement can be significant especially for large-scale network delivery tasks. จัดส่วนเหลือของกระดาษดังนี้ ส่วน 2 กำหนดทบทวนวรรณกรรม VRP และปัญหาเส้นทางที่เหมาะสมที่สุดในเครือข่ายมาตรฐาน ใน 3 ส่วน กำหนดมาตรฐานเครือข่าย และรูปแบบของ STDVRPTW ที่เป็นสูตร ใน 4 ส่วน ขั้นตอนวิธีการก่อสร้างเส้นทางการนำเสนอ ตัวอย่างการคำนวณและการวิเคราะห์จะแสดงในส่วน 5 ในส่วน 6 บทสรุปจะ และทิศทางในอนาคตได้
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