基于逆序信号驱动的紧密衔接综合调度算法

针对以往综合调度中紧密衔接调度算法只能处理单一紧前工序的情况,使算法具有局限性问题,提出基于逆序信号驱动的紧密衔接综合调度算法.该算法先建立设备和调度2个子系统,并通过相互间传递的信号驱动逆序调度;对于紧密衔接工序组包含非单一紧前工序的情况,将紧密衔接工序组定义为一棵特殊的紧密衔接子树,采用逆序调度的方式自顶向下对紧密衔接问题求解;当信号驱动时刻存在多个可调度工序(组)时,按最大可并行性选择策略选择子节点关键路径长的工序(组)调度;对于可调度工序直接锁定该工序的加工时间段;对于可调度工序组,则按锁定紧密衔接工序组的前沿贪心策略锁定工序组的加工时间段.由于采用逆序调度和锁定紧密衔接工序组的前沿贪心策略,可使各紧密衔接工序组独立调度,实现紧密衔接紧前工序数无限制的综合调度.

存在多工序同时结束的多车间逆序综合调度算法

针对存在多工序同时结束的单件复杂产品的多车间制造问题,提出了存在多工序同时结束的多车间逆序综合调度算法。首先,为解决正序调度需迁移虚拟工序导致的设备资源空闲和操作复杂的问题,设计了逆序分批次调度策略;然后,为减少工序迁移和车间负载尽量均衡,设计了逆序车间确定策略确定所有工序的加工车间;最后,为满足多工序同时结束的特殊约束,设计了逆序同时开始策略确定每组虚拟工序组的逆序开始加工时间。实例验证表明,所提出算法满足特殊约束,完工时间较短且工序迁移次数少。

江西省“五河”流域水量分配数学模型研究

基于江西水资源特点,提出了适合于多节点、多水库水量分配的逆序多水库联合调度法计算模型,实现了江西五大河流及"五河"外的水量分配计算.

An integer multi-objective optimization model and an enhanced non-dominated sorting genetic algorithm for contraflow scheduling problem

To determine the onset and duration of contraflow evacuation, a multi-objective optimization(MOO) model is proposed to explicitly consider both the total system evacuation time and the operation cost. A solution algorithm that enhances the popular evolutionary algorithm NSGA-II is proposed to solve the model. The algorithm incorporates preliminary results as prior information and includes a meta-model as an alternative to evaluation by simulation. Numerical analysis of a case study suggests that the proposed formulation and solution algorithm are valid, and the enhanced NSGA-II outperforms the original algorithm in both convergence to the true Pareto-optimal set and solution diversity.