【作者】 陈昱超；

【导师】 罗兵；

【作者基本信息】 重庆大学 ， 管理科学与工程， 2006， 硕士

【摘要】 库存控制一直是生产运作管理的重要组成部分。为满足生产和销售的需要,企业通常设置一些存货。但存货过多,会占用企业大量流动资金,还必须支付一定数额的保管、变质等成本。库存量过低,又会发生停工待料或者订单丢失等,同样会给企业造成经济损失。因此,如何运用科学管理方法来解决这些问题就成为库存控制的目标。论文在短缺量拖后率不相同的边生产边需求库存模型基础上,进一步考虑物品变质对库存控制决策的影响,建立了相应的经济制造批量模型,通过仿真寻优得到系统唯一最优解。灵敏度分析表明,物品变质系数对最优生产周期、最优缺货时间、最优生产批量以及库存系统各项成本等有不同程度的影响。因此,企业在进行库存决策时必须考虑物品变质的程度,以确定最佳生产周期和缺货时间,使库存系统总成本最低。将上述模型应用于重庆BELL公司的库存系统,对其最优生产周期、最优缺货时间、最优生产批量以及库存系统各项成本等进行了测算。分析表明,采用经济制造批量模型制定库存控制策略后,库存系统总成本可得到大幅度降低。考虑变质物品在有现货和仓库出空阶段生产率不相同以及成本费用时值对库存管理的影响,建立了相应的经济制造批量模型,运用5.0版数学软件进行仿真寻优,得到系统唯一最优解。灵敏度分析表明,物品变质率、成本费用贴现率、生产率以及短缺量拖后因子对最优生产周期个数、每周期最优缺货时间、生产批量以及库存系统各项成本等有不同程度的影响,在进行库存决策时必须考虑这些因素,以调整生产周期个数和每周期缺货时间,使库存系统总成本尽可能低。更多还原

【Abstract】 Inventory control is a key sector in operations management. In order to meet the demand of production and sales, Companies always build up some inventories. However, high inventory would occupy companies’cash flow, raise more holding cost and deteriorating cost, etc; while low inventory would lead to production halt and orders loss. Therefore, how to settle such problems in scientific management methods becomes the goal of inventory control.Based on the inventory model of production while demanded with different backlogging rate, an EPQ model was developed for deteriorating items. A numerical example and sensitivity analysis are presented to illustrate the model. It is proved that the deteriorating rate has different impacts on inventory control policy. Adjusting the production cycle and shortage time can cut down the inventory total cost.This model was applied in the inventory system of The Chongqing BELL Ltd. Co., whose optimal production cycle, optimal shortage cycle, optimal lots size and all costs were computed. The analysis indicates that the establishment of inventory policy with adopting EPQ model is able to highly reduce the cost of inventory system.The other EPQ model was developed for deteriorating items taking account of the time-value of costs with different production rate. A numerical example and sensitivity analysis are presented to illustrate the model by Mathematica software Version 5.0. It is proved that the parameters (including deteriorating rate, discount rate, production rate, backlogging rate, etc.) have different impacts on inventory control policy. The decision can be made by adjusting the number of production cycle and shortage time per cycle. It will cut down the total cost as low as possible.更多还原