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从系统的角度 ,从问题范围、随机因素、动态因素、能力约束、时限约束、成本费用、优先因素、优化目标、最终要求等方面对PTP问题进行了详细的分析定义 ,并对其约束条件进行了系统归纳 ,建立了以运输系统的总运输费用、单位邮件的平均传递时限、车辆运输能力的平均利用率为优化目标 ,包含 12类约束条件的多目标数学规划模型 ,并对该模型涉及的有关问题进行了分析 ,有利于PTP问题的进一步深入研究。以该模型和相应算法为基础开发了物流优化调度软件系统。
From a systemic point of view, the PTP problem is analyzed and defined in detail from the aspects of problem scope, stochastic factors, dynamic factors, ability constraints, time constraints, cost and expenses, priorities, optimization objectives and final requirements. The system generalization, the establishment of a multi-objective mathematical programming model with 12 types of constraints including the total transportation cost of the transportation system, the average delivery time of the unit mail and the average utilization rate of the vehicle transportation capacity, The analysis of the relevant issues is conducive to further in-depth study of PTP issues. Based on the model and the corresponding algorithm, a software system of logistics optimization scheduling is developed.