为了降低非预期生产急件对关键设备正常生产活动的冲击,保证生产计划的稳定性,研究了关键设备的应急生产缓冲设计问题,为生产管理者合理地确定预留产能提供了理论依据。结合排队理论,分析了生产急件到达和处理活动,证明其属于一类负指...为了降低非预期生产急件对关键设备正常生产活动的冲击,保证生产计划的稳定性,研究了关键设备的应急生产缓冲设计问题,为生产管理者合理地确定预留产能提供了理论依据。结合排队理论,分析了生产急件到达和处理活动,证明其属于一类负指数随机过程,揭示了生产状态的动态转移规律和实现条件;将关键设备组的急件加工过程描述为一类GERT(graphic evaluation and review technology)模型,测算状态转移过程的状态转移参数和矩母函数;结合梅森公式,设计系统状态稳态概率的求解方法,分析关键设备生产缓冲与稳态概率之间的关系,探寻其定量化表征。通过某研究院加工中心设备组的案例研究,发现关键设备组因急件冲突导致月生产计划变更的情况平均降低14.6%,较好地控制生产计划与调度工作的不良波动,从而验证了模型和方法的可行性和适用性。展开更多
旅行费用与时间是人们出行选择路径时考虑的重要因素。本文讨论了车辆随机路径旅行费用与距离、时间之间的函数关系,在假定旅行费用与距离、时间正相关的条件下,依据矩母函数和 Mason 公式,给出车辆随机路径选择的 GERT 算法,并通过一...旅行费用与时间是人们出行选择路径时考虑的重要因素。本文讨论了车辆随机路径旅行费用与距离、时间之间的函数关系,在假定旅行费用与距离、时间正相关的条件下,依据矩母函数和 Mason 公式,给出车辆随机路径选择的 GERT 算法,并通过一个应用实例,表明了该算法的有效性。展开更多
Battlefield Damage Repair (BDR) is an important factor to keep and recover the battle effectiveness of materiel. Predicting and holding the BDR time of a materiel system exactly can bring great convenience to implemen...Battlefield Damage Repair (BDR) is an important factor to keep and recover the battle effectiveness of materiel. Predicting and holding the BDR time of a materiel system exactly can bring great convenience to implement timing and exacting command for commanders. Meanwhile, it is important to the decision making of development and of future materiel, in the same way. Taking certain propelled type automatic weapon as an example, this paper sets up an exacting problem solving model for calculating BDR time based on a random network and carries out computation of it. Research results indicated that this method is feasible.展开更多
文摘为了降低非预期生产急件对关键设备正常生产活动的冲击,保证生产计划的稳定性,研究了关键设备的应急生产缓冲设计问题,为生产管理者合理地确定预留产能提供了理论依据。结合排队理论,分析了生产急件到达和处理活动,证明其属于一类负指数随机过程,揭示了生产状态的动态转移规律和实现条件;将关键设备组的急件加工过程描述为一类GERT(graphic evaluation and review technology)模型,测算状态转移过程的状态转移参数和矩母函数;结合梅森公式,设计系统状态稳态概率的求解方法,分析关键设备生产缓冲与稳态概率之间的关系,探寻其定量化表征。通过某研究院加工中心设备组的案例研究,发现关键设备组因急件冲突导致月生产计划变更的情况平均降低14.6%,较好地控制生产计划与调度工作的不良波动,从而验证了模型和方法的可行性和适用性。
文摘Battlefield Damage Repair (BDR) is an important factor to keep and recover the battle effectiveness of materiel. Predicting and holding the BDR time of a materiel system exactly can bring great convenience to implement timing and exacting command for commanders. Meanwhile, it is important to the decision making of development and of future materiel, in the same way. Taking certain propelled type automatic weapon as an example, this paper sets up an exacting problem solving model for calculating BDR time based on a random network and carries out computation of it. Research results indicated that this method is feasible.