摘要
随着计算机技术、电子信息技术和网络通信技术的飞速发展,现代船舶的自动化程度越来越高,逐步形成机舱自动化、航行自动化、信息一体化、装载自动化相结合的全船综合自动化。机舱自动监测系统是机舱自动化的重要组成部分,它的核心内容采集和管理机舱设备运行参数、设备状态、故障信息。本文主要是根据无线传感器网络在船舶机舱监测系统内应用中,MAC层协议不能满足船舶机舱监测的需要这一问题,对网络MAC层协议进行了优化与仿真。
本文首先介绍了课题的研究目的、意义以及背景,并概述了船舶机舱自动化和WSN各自的发展现状。其次,文中对WSN的体系结构和船舶现有的监测系统进行了分析和总结；对WSN在船舶机舱内的应用进行了总体的设计,并分析了现有无线传感器MAC层协议,指出了现有协议不能很好的适用机舱内的应用；根据MAC协议的设计准则,设计了shipwsn-mac协议。通过构建使用不同信道的虚拟簇、增加没有传输任务节点的休眠时间、优化同步算法和改进退避算法,分别降低了节点的能耗、提高了节点间的同步精度和降低了网络流量大时信道的冲突。最后应用OPNET仿真平台对现有协议和shipwsn-mac协议进行了仿真,对比和分析了仿真结果,并对全文的内容作了总结和展望。
本课题是针对船舶机舱内WSN的MAC层协议的优化与仿真,改善了现有无线传感器协议的不足,满足了船舶机舱设备的监测要求,使无线传感器网络可以更好的应用在机舱设备监测中,并为无线传感器网络在船舶机舱内的应用又解决了一个难题。
With the rapid development of computer control technology, electronic information technology and network communication technology, modern ship's automation has improved greatly, and has gradually formed ship comprehensive automation including the engine room automation, sailing automation, information integration and loading automation. The engine room auto-monitoring system is an important component of engine room automation, whose main function was the collection and management of the operating parameters, equipment state and malfunction information of engine room's equipment. This article is based on wsn in the Engine Room Monitoring system application, MAC protocol does not meet the needs of ship engine room monitoring, optimization and simulation for MAC protocol.
First of all, this article introduces the purpose and significance of the study, the research background, and the current condition of vessel engine room automation and WSN. Second, analyzing and summarizing the WSN structure and the existing vessel monitoring system, designing the applications of WSN in the engine room. Analyzing the MAC protocols of WSN, pointing out that the existing protocols can not be good for the application of the cabin. Designing the shipwsn-mac protocol bass on design criteria. Constructing virtual clusters that use different channels、increasing sleep time of the nodes that do not transfer、Synchronization algorithm and the backoff algorithm optimization, in order to reduce the energy consumption of nodes、improve the synchronization accuracy between nodes and reduce the channel conflict as network traffic flow. Finally, the existing protocols and shipwsn-mac protocol were simulated by OPNET, comparison and analysis of the simulation results, and made a summary and outlook.
The article is that the MAC protocol of WSN in engine room optimization and simulation and improving the existing wireless sensor protocols, meeting the monitoring requirements of ship engine room equipment. WSN applications would be better on monitoring equipment in the cabin, and solving a problem that the WSN application in the engine room.
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