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侧向转运是库存共享的一种方式,一方面会减少库存成本,另一方面又会因转运而增加运输成本,针对这一问题考虑不同时间窗Wk的服务水平产生的服务水平的分级,构建三级分销网络中基于库存共享与时间服务水平限制的批量订货模型,分销网络模型中包含一个制造商、一个RDC、m个DC、n个客户。其中客户的需求相互独立且服从泊松分布,DC的订货提前期服从指数分布。首先,建立了基于时间服务水平限制的分销网络系统总成本最小化模型,并将再购点、订购批量等库存参数作为同时作为决策变量,以达到三级备件分销网络的成本优化;其次,根据问题和模型的特点对所建的模型开发了基于采用贪婪增加算法的求解思想求解问题,以便给管理者提供决策参考并通过降低利润的方式增加效益和资源利用率;最后,通过中航材集团推行的“航材共享”项目作为算例分析,将三个分销区域与机场群组成的备件分销系统进行建模分析,验证了本文模型的有效性,成本优化的显著性。研究结果表明,三级分销网络中,RDC采用连续盘点的(Q,R)补货策略、DC采用(Q,R,H)的补货策略时系统总成本与普遍采用的定期盘点策略和连续盘点中的One-for-One订货策略成本相比,DC之间的库存共享策略能有效降低整个系统的成本,例如,在案例研究中发现成本降低约为30%。
Lateral transport is a way of inventory sharing, which will reduce the inventory cost on the one hand and transport costs due to transshipment on the other. To solve this problem, we consider the classification and construction of service levels resulting from service levels at different time windows. Three-level distribution network based on inventory sharing and time service level limit batch ordering model, the distribution network model includes a manufacturer, an RDC, m DC, n customers. Among them, the customer’s needs are independent and subject to Poisson distribution. DC’s lead time obeys exponential distribution. Firstly, a total cost minimization model of distribution network system based on time service level restriction is established, and inventory parameters such as point of purchase and order volume are taken as decision variables at the same time to achieve the cost optimization of the third-level spare parts distribution network. Secondly, Problems and model characteristics of the model was developed to solve the problem based on the use of greedy algorithm to solve the problem solving ideas in order to provide managers with decision-making reference by reducing the profit way to increase efficiency and resource utilization; Finally, the implementation of the Group through the Air As an example, this paper analyzes the model of spare parts distribution system consisting of three distribution areas and airport clusters, and verifies the validity of the model and the significance of cost optimization. The results show that in the three-tier distribution network, RDC uses continuous inventory (Q, R) replenishment strategy. When DC adopts the replenishment strategy of (Q, R, H), the total system cost and the commonly used periodic inventory strategy and continuous Compared with the one-for-one order strategy cost in inventory, the inventory sharing strategy between DCs can effectively reduce the cost of the entire system. For example, in the case study, it is found that the cost reduction is about 30%.