多周期非平稳库存控制模型比较分析

发布时间：2018-06-19 07:04

本文选题：库存控制 + 服务约束水平　；参考：《青岛大学》2017年硕士论文

【摘要】：随着科技的进步和生产力的发展,客户需求越来越个性化和多样化,产品生命周期不断缩短,以及其它一些不确定性因素的影响,使得很多产品的需求呈现随机性和不平稳性,给企业的生产和库存管理带来了巨大挑战。研究非平稳需求库存控制方法具有重要意义。本文研究了有订购提前期以及服务水平约束的非平稳多周期随机需求库存控制问题。首先,给出了库存决策的一般框架。然后,以控制库存总成本最小化为目标,以订货点和订货量为决策变量,建立了非平稳需求的随机静态库存控制模型和静动结合库存控制模型,并给出了相应的求解方法,并分析了现有模型的不足之处。进而针对不同特征的需求模式,采用不同方式对未来需求作预测,利用预测结果和建立的模型进行库存决策,并通过仿真实验分析两种不同的库存控制方法的效果。研究结果表明,在不同需求情况下,两种库存控制策略的效果有所不同。在周期性需求情况下,静态策略和静动结合策略效果相差不大。而在趋势型以及混合型的情况下,静动结合策略要优于静态策略。在改变库存控制模型参数情况下,两种策略效果有所不同,特别地,在其它参数保持不变的情况下,变异系数越大,即需求波动越大时,库存越不易控制,会增大成本;服务水平越高时,持有库存数量就越多,总成本就越高;库存持有成本增加时,订货次数增多,也使得总成本增加。研究结果对非平稳随机库存控制问题提供了一定指导。
[Abstract]:With the progress of science and technology and the development of productivity, the demand for customers is becoming more and more personalized and diversified. The life cycle of the product is shortened and the other uncertain factors are influenced, which makes the demand of many products present randomness and instability, which brings great challenges to the production and storage management of the enterprises. The inventory control method is of great significance. This paper studies the non stationary multi cycle stochastic demand inventory control problem with order lead time and service level constraints. First, the general framework of inventory decision is given. Then, the objective of controlling the total inventory cost minimization is to establish the non stationary phase with the order point and order quantity as the decision variables. The stochastic static inventory control model and static dynamic combined inventory control model are used, and the corresponding solution method is given, and the shortcomings of the existing model are analyzed. Then, the future demand is predicted by different modes of demand pattern, and the inventory decision is made by using the forecast result and the model, and the imitation is made by imitation. The results of two different inventory control methods are analyzed in real experiments. The results show that the effectiveness of the two inventory control strategies is different under different demand conditions. Under the periodic demand, the static strategy and the static and dynamic combination strategy have little difference. The static and dynamic combination strategy is better than the trend and mixed mode. Under the condition of changing the parameters of the inventory control model, the effect of the two strategies is different. In particular, the greater the coefficient of variation is, the greater the variation coefficient is, the less the inventory is controlled and the cost will increase when the other parameters remain unchanged. The higher the service level is, the more the stock is in stock and the higher the total cost; inventory holding is higher. When the cost increases, the number of orders increases, and the total cost increases. The research results provide guidance for non-stationary stochastic inventory control problems.
【学位授予单位】：青岛大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：F274

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