存在设备有关延迟约束的综合调度算法

摘要

Aiming at the problem that the present integrated scheduling ignores the device-dependent deferred constraint ( DDC) thus the scheduling result is affected, an integrated scheduling algorithm with the device-dependent deferred constraint is proposed. On the basis of the concepts of standard procedure, device-dependent deferred procedure ( DDP) and the processing tree with the device-dependent deferred constraint, the algorithm converts the wait-ting delay time into the device-dependent deferred procedure, thus the scheduling problems with the device-dependent deferred constraint are converted into the general integrated scheduling problem being easy to solve. Then, the order of the procedures is determined by the allied critical path method ( ACPM ) , and the start time of procedure is determined by the forward greedy rule. The strategy for device-dependent delay procedure cooperating adjustment is proposed to make affected standard procedures start early. The experimental results show that the proposed algorithm can solve the integrated scheduling problems with device-dependent deferred constraint. The scheduling result is more accurate, and the total processing time is reduced without increasing the algorithm complexity.%针对目前综合调度中没有考虑设备有关延迟约束(DDC)影响调度效果的问题,提出了存在设备有关延迟约束的综合调度的算法.该算法在标准工序、设备有关延迟工序(DDP)和包含设备有关延迟约束的加工工艺树等概念的基础上,将等待延迟时间转化为设备有关延迟工序,使存在DDC的调度问题转变为较易解决的一般综合调度问题,再用拟关键路径法( ACPM)确定工序的调度次序,最后用前沿贪心规则确定工序的开始时间.为了使设备有关延迟工序影响的工序尽早开始,进一步提出了设备有关延迟工序配合调整的策略.实验表明,该调度算法能够有效解决存在设备有关延迟约束的综合调度问题,可在不提高算法复杂度的前提下,提高调度结果的精度并减少产品总的加工时间.