基于Petri网的包装物流系统建模仿真与优化

采用离散事件动态系统理论和Petri网建模技术,研究包装物流系统建模、仿真与优化,描述和分析系统要素及逻辑序列.以纸箱包装物流系统为例进行建模、仿真,优化分析,获得了该系统的优化模型.结果表明,这种研究方法可行有效.     

改善物流系统 提高企业效益

论述某变压器厂物流、仓储系统的规划和设计，在该企业的物流关系上，采用“先主干、后分支”的分析；在整个系统中，模拟投入产出的数学模型；在确定最佳方案上，借助于因素加权法和物流机械的合理匹配等优化措施，不仅产生了可观的经济效益，并且方便了管理，改善环境，减轻劳动，提高产品质量等社会效益。     

图书推荐

物流系统优化与仿真 简介：本书综合运筹学、系统工程、计算机应用等领域的相关知识,以供应链环境下的第三方物流系统作为研究对象,探究进行计算机建模和系统仿真与优化的途径及方法。主要内容包括：现代物流系统基础、物流系统仿真方法和物流系统优化方法。     

基于eM-Plant的生产物流系统仿真与应用

以某制造企业的生产物流系统为例,通过eM-Plant建模仿真,在不同的优化目标下,根据企业实际调整生产物流系统的参数和条件,并对比分析仿真结果,提出了可行的优化措施,为企业生产物流系统最终优化方案的确定提供决策参考。     

家电行业生产中的现代物流系统设计

分析了家电行业生产系统及其相应遥物流系统的特点，提出了复杂物流系统布局的基本原则，并给出了一布局示例；同时，根据大批量生产对物流计算机监控和管理系统的要求，提出了采用分布式调度管理的思想来构造系统的结构及确定系统运行方式的方案，并设计出了基于多进程的监控与管理系统软件的结构。     

海南烟草现代物流系统设想

本设想是建设进一步实现仓储管理系统、分拣系统、物流智能调度系统等信息共享，满足现代化物流配送中心作业和管理的需要，在物流作业过程控制的过程中，实现全面和精细的成本管理，并采取考核体系进行绩效考核，以实现烟草公司现代化流通企业管理模式，同时发挥省级烟草公司宏观管理的作用，建立以物流运营监控、分析为基础的省级海南烟草物流管理信息系统。     

第四方物流及对物流规划功能的外包

随着企业与物流的发展，物流的规划决策外包越来越受到重视。介绍了一种解决物流规划功能外包问题的物流方案－－第四方物流，对其定义与工作方式进行了详细的介绍，并以实例证明，第四方物流能够进一步降低物流的成本，提高物流效率。     

物流系统评价的数量化方法及其应用

通过多指标决策方法的研究,分析物流系统综合评价的一般步骤与基本方法.在运用数量化技术对指标进行标准化处理并确定指标权重系数的基础上,提出了利用线性加权和法对物流系统进行评价的基本思路,结合实例给出了线性加权和法应用的具体操作步骤.     

基于系统动力学的医院智能物流系统模型构建研究

随着医院物流系统的复杂性不断提高,如何优化和管理该系统成为研究焦点。本研究基于系统动力学方法,针对医院智能物流系统进行深入探讨,并构建模型。主要目的是解决现有物流系统中的效率低、资源浪费等问题。研究结果表明,经过优化的物流模型能够提高30%的工作效率,并减少20%的资源浪费。本研究的创新点在于首次采用系统动力学方法针对医院智能物流系统进行建模,为医院物流管理提供全新的解决思路,具有重要的理论价值和实际应用前景。     

面向知识经济的航运物流系统

为迎接知识经济的挑战,航运业作为工商企业第三方航运物流提供者,其竞争焦点开始从价格转向服务,为客户提供压缩时间空间的物流流增值服务。主要围绕航运物流系统理论讨论了航运物流发展思想的确立,分析了航运物流系统的建立基础以及航运物流系统的基本模式,并对航运物流系统中的企业流程重组进行了探讨。     

基于Flexsim的某医药物流中心拣货流程优化研究

目的将Flexsim仿真软件应用于医药物流行业,以提高医药物流中心零货库拣货流程的运作效率。方法以某大型医药物流中心为研究对象,根据该零货库区的布局,使用Flexsim仿真软件进行建模仿真,并根据订单拣选作业流程运用Flexsim脚本语言和C语言进行了编程。分析模型运行结果,找出了瓶颈,并对拣货流程进行了优化。结果优化后的流程,提高了拣货作业的效率,缩短了拣货时间。结论采用建模仿真的方法,找出拣货流程的瓶颈问题,并进行合理优化,可以提高医药物流中心零货库的拣货效率。     

基于SLP和SHA的车间设施布局与仿真分析

应用SLP和SHA结合方法对实际企业的新建车间进行设施及物流系统的布置设计与评估,并进一步运用Delmia/QUEST仿真软件模拟车间运行情况,最终得出车间物流最为顺畅、设施布置与设备配置最为经济合理的设计方案。结果表明该设计方法能在一定程度上弥补传统设计方法无法考虑到的因素,可为车间实际生产运行提供有效的仿真数据,是一种车间设施布置设计的有效方法。     

Evaluation by simulation to optimise information systems’ personalisation quality in logistics

Personalised information systems (PISs), related to different fields (travelling and mobility, production, logistics and so on), represent an object of many research and development perspectives. Using PISs, it becomes possible to supply the user only with the pertinent information that suits their preferences. Indeed, thanks to personalisation, the user may feel that a particular PIS is developed for them. This system adaptation becomes a necessity for the user's satisfaction. In this context, many studies were orientated toward the user modelling, the design methods of PIS and the personalisation algorithms, etc. but, the evaluation of these systems is neglected. Difficulties concerning context-centred evaluation appear. This paper is focused on the evaluation of the personalised information systems in order to optimise the personalisation quality according to several criteria. For such systems, it is important to envisage new adapted evaluation methods. An evaluation method using a PIS simulation model, called MetSim (Method evaluation per Simulation), is proposed. MetSim is also based on the case-based reasoning system to identify problems. This evaluation approach has been validated by applying it to assess PISs in the logistics field.     

Integrated analysis of quality and production logistics performance in manufacturing lines

This paper presents an analytical method for evaluating the performance of production systems, jointly considering in a unique framework quality and production logistics performance measures. In the literature, quality and production logistics have traditionally been investigated using independent approaches. Thus far, only a few recent contributions have focused on their mutual inter-relation, showing that benefits can be achieved from an integrated analysis. This paper contributes to this growing research by considering, for the first time, production systems in which the behaviour of the machines is monitored by statistical control charts. The control action performed by the quality control system on the machines is directly modeled. Moreover, the impact of the quality control action on the logistic flow of parts in the system is taken into account. In order to estimate the performance of such systems, an approximate analytical method based on the system decomposition technique is developed. The accuracy of the method is assessed by comparing the results with those obtained by simulation. Analysis of the results provides new insights into the relations among the quality and production logistics performance measures and paves the way to the development of integrated design techniques for improved configurations of the system as a whole.     

Influencing factors of synchronization in manufacturing systems

Manufacturing systems exhibit two types of synchronisation phenomena: logistics and physics. Previous research has established synchronisation measures for both types and has shown that they are related to the due date performance. However, there is a lack of knowledge about the factors triggering synchronisation emergence as well as a holistic understanding of synchronisation effects on logistics performance. Thus, this research aims to further explore the relation between synchronisation, its influencing factors and its effect on logistics performance. Based on a profound literature review, we derive first hypotheses on the cause-and-effect-relationships between structural and dynamic properties of a manufacturing system and the emergence of logistics and physics synchronisation as well as logistics performance. By conducting a discrete-event simulation study on diverse manufacturing system types (line, flow shop and job shop production), we are able to test these hypotheses. We conclude that manufacturing network architecture as a structural property as well as processing time variability and system workload as dynamic properties may be exploited for an advanced and synchronisation-oriented manufacturing system design.     

Simulation optimization of logistics systems through the use of variance reduction techniques and criterion models

Simulation is a useful tool for modelling logistics systems. However, simulation itself is not an optimization tool. Therefore attempts have been made to combine simulation and optimization. Optimization of a logistics system through the use of simulation is difficult for several reasons. Because of the size and complexity of logistics systems, it is often necessary to consider the trade-offs between multiple conflicting performance measures for the system. One major drawback associated with commercially available tools is that users are not able to consider these trade-offs easily. To overcome this drawback, a simulation model can be developed to employ multi-objective decision analysis techniques such as criterion models which can then be optimized. This article illustrates how criterion models can be interfaced with simulation models of logistics systems. In addition, this article includes the programming and implementation of the variance reduction techniques of common random numbers and antithetic variates.     

物流中心选址的一种综合方法

物流中心选址是建立物流系统的关键环节。本文建立了一种针对企业采购与销售的整个上下游物流活动的物流中心选址模型，同时结合模糊评价法以综合考虑选址过程中的非费用因素，对选址方案进行评价，选取最优选址方案。     

经济订货批量研究

以企业生产物流中的库存管理为切入点,通过批量折扣的双箱系统模型,定量地分析了需求的再订购批量和折扣批量之间的关系。指出了JIT的局限性,并且简要地介绍了新型的库存管理方法一VMI(供应商管理用户库存),同时提出了一些见解。     

Simulation-based optimisation of logistics distribution system for an assembly line with path constraints

The design of logistics distribution system for an assembly line with given layout is usually constrained by various factors such as the vehicles for the distribution of assembly components and the paths on the shop floor for the vehicle movement. Since design optimisation of these production systems with such constraints is hard to solve by mathematic approaches, simulation-based approach is mostly used. In this paper, simulation-based analysis and optimisation of a logistic distribution system is performed combined with a heuristic algorithm to obtain a solution that most suits the practical requirements of an assembly line. The proposed simulation-based method builds a model that satisfied various complicated real-world problems at the work site of an investigated factory. Meanwhile, a dynamic dispatching method for vehicle movement is also presented which can adjust the control strategy and decision parameters dynamically in the process of simulation and contributes significantly to form a more fruitful design scheme. Experimental results show that proposed method performs better than the analytical model-based approach and some other methods, and the dynamic vehicle dispatching method presented performs better than some existing common strategies used in literature.     

A Simulation Generator for Flexible Manufacturing Systems Design and Control

Recent developments in simulation languages have enabled the modeling of complex and large systems. Systems modeling using simulation has many advantages. Even though the creation of realistic models using a simulation language is becoming easier, it is not trivial. Simulation languages are not designed to be problem-specific. Furthermore, the art of systems modeling can be quite time consuming.

This paper describes a user-oriented simulation generator for the design and control of flexible manufacturing systems (FMS). The simulation generator serves as a preprocessor to the SIM AN simulation language. The generator converts data into a simulation model and automatically runs the simulation program. Standard output is provided by the simulation program, as well as plots and histograms of performance measures of interest to the analyst.

Model development is significantly simplified by the simulation generator described in this paper. Simulation generators can be developed in a relatively short period of time by using an existing simulation language. Simulation generators represent a very attractive alternative to specialized simulation languages.