大型货船物资转运的仿真研究

发布时间：2018-04-24 12:53

本文选题：物资转运 + 层次着色Petri网　；参考：《哈尔滨工程大学》2012年硕士论文

【摘要】：船舶物流是现代物流的重要组成部分，对大型货船内部的物资转运过程进行仿真，可以比较直观地观察物资的转运流程、转运过程中资源的调度状态等，进而可以对物资转运方案的合理性、货船物资转运系统的性能等进行分析。本文首先分析了某大型货船物资转运系统的组成、物资转运流程及特点，并总结了影响物资转运流程的各种因素。通过分析可知，采用Petri网对物资转运过程进行建模，可以有效地表达转运过程中出现的并发、异步、冲突、资源共享等现象。在此基础上，本文总结了对物资转运过程进行层次化建模的步骤，并采用层次着色Petri网对物资转运过程进行了建模。为了对物资转运过程Petri网模型进行动态仿真，，本文设计了物资转运Petri网仿真模块。采用面向对象技术，分析了Petri网仿真运行的基础，并通过最小事件调度法，实现了物资转运Petri网模型的动态运行。在仿真过程中，若物资转运方案未知，则运用基于规则的启发式算法，计算出转运资源的调度方案，并在此方案下完成转运过程的仿真，从而实现了Petri网动态仿真与调度方案生成的融合。仿真结束后，通过对仿真数据的综合分析，计算货船物资转运系统的多种性能指标，并确定转运过程中存在的转运瓶颈，为后续货船物资转运流程的设计提供参考。本文采用面向对象技术，开发了基于Petri网的大型货船物资转运仿真系统，实现了Petri网模型的创建、存取、仿真及仿真数据统计分析等功能，并通过实例验证了该系统的实用性。同时通过实例证明本系统具有一定的通用性，可作为动态离散事件系统的建模、仿真工具。
[Abstract]:Ship logistics is an important part of modern logistics. To simulate the material transfer process of large cargo ship, we can observe the transfer process of goods and materials, the scheduling state of resources in the process of transshipment and so on. Then the rationality of material transfer scheme and the performance of cargo ship material transfer system can be analyzed. In this paper, the composition, process and characteristics of the material transfer system of a large cargo ship are analyzed, and the factors influencing the material transfer process are summarized. Through the analysis we can know that using Petri net to model the material transfer process can effectively express the phenomena of concurrency asynchrony conflict and resource sharing in the process of transshipment. On this basis, this paper summarizes the steps of hierarchical modeling of material transfer process, and uses hierarchical colored Petri nets to model the material transfer process. In order to dynamically simulate the Petri net model of material transfer process, the simulation module of Petri net is designed in this paper. Based on the object-oriented technology, the paper analyzes the foundation of Petri net simulation, and realizes the dynamic operation of Petri net model of material transportation by means of minimum event scheduling method. In the simulation process, if the material transfer scheme is unknown, the scheduling scheme of the transfer resources is calculated by using the heuristic algorithm based on rules, and the simulation of the transfer process is completed under this scheme. Thus, the integration of dynamic simulation and scheduling scheme generation of Petri net is realized. After the simulation, through the comprehensive analysis of the simulation data, a variety of performance indexes of cargo ship material transfer system are calculated, and the transfer bottlenecks in the process of transshipment are determined, which provides a reference for the design of the subsequent cargo ship material transfer process. In this paper, an object oriented simulation system based on Petri net for large cargo ship is developed. The functions of Petri net modeling, access, simulation and statistical analysis of simulation data are realized, and the practicability of the system is verified by an example. At the same time, it is proved that the system is universal and can be used as a modeling and simulation tool for dynamic discrete event systems.
【学位授予单位】：哈尔滨工程大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：U695.2

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