基于FCS的船舶机舱智能监控系统的研究
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摘要
本文针对当前多微处理器多层结构的船舶机舱自动监控系统存在的系统结构
    复杂、设备互操作性差、系统维护和扩展不便、缺乏对系统状态信息进行智能预
    测分析等有待进一步研究的问题,对船舶机舱自动监控系统的硬件和软件进行了
    分析,提出了一种基于现场总线技术的船舶机舱智能监控系统的设计方案。
     利用现场总线技术,建立由管理计算机和智能节点组成的两层网络结构,取
    消原系统中间层的通信转发站,数据采集和通信由安装在现场的智能节点完成,
    简化了系统结构,增强了系统的可靠性。并对基于LonWorks现场总线的监控系
    统各主要功能模块进行了设计。
     采用模块化、通用化的软件设计思想,提出利用数据库技术管理系统监测参
    数的方案,设计了多种用于参数显示的控件,使系统监控软件的组态和维护容易,
    增强了系统的通用性、灵活性和可扩展性。
     提出一种结构简单、学习速度快捷、适合于动态过程在线多步预测分析的
    DRNN预测模型及其在线学习的TD-DBP复合学习算法。解决了非线性动态
    过程基于前馈网络或反馈网络的预测模型需要事先确定系统模型阶数的问题。
     把基于人工神经网络的预测分析模块集成到船舶机舱监控系统软件中,为船
    舶机舱监控系统增加对监测参数在线动态趋势分析的功能,提高监控系统的可靠
    性和安全性。
     对本文提出的设计方案,在上海海运学院自动化机舱实验中心,通过安装调
    试,取得了令人满意的效果。本设计方案,能简化系统结构,增强系统的信息处
    理能力,提高系统的可靠性,增强系统的通用性、灵活性和可扩展性,能方便地
    把船舶机舱自动化系统与船舶其它自动化系统集成为一个完整的船舶综合信息网
    络,实现信息共享。
Practically, the reliability, maintainability, real-time control ability and
     interoperability are required by the monitor and control system for marine engine room.
     However the monitor system based on the multi-microprocessors and the hierarchical
     structure is not so satisfied in such requirements, owing to its complex structure and
     devoted communication sub-stations. In order to solve this problem, a design method
     of intelligent monitor system based on field-bus control system (FCS) for marine
     engine room is presented in this dissertation.
    
     To simplify the structure of the monitor and control system and to enhance its
     reliability, a monitoring network composed of a management computer and the
     multiple intelligent nodes is constructed using field-bus technology. In this system,
     each intelligent node can be installed at any control or measurement field to realize the
     functions of both data-acquisition and communication. Because the FCS features much
     higher performances as compared with DCS, it can be used as the updated substitute of
     DCS-based monitor system for marine engine room. In this dissertation, the design of
     the main functional units as well as the configuration of the monitor system is
     described.
    
     To supply much easier maintenance and configuration to the monitor system, a
     design method of the system software based on database technology is presented in
     this dissertation. All process parameters in the monitor and control system are
     managed by the databases, with one being used specially to manage the process points
     including the number and name of each sensor, the range of each measurement, the
     alarm limit and the measuring channel etc. Besides, some universal display modules
     are designed for the monitor software.
    
     A new adaptive optimal predictor based on diagonal recurrent neural network
     (DRNN) is present in this dissertation. And a new TD-DBP algorithm combined
     temporal difference algorithm with dynamic back-propagation algorithm is proposed
     for DRNN on-line learning. Usually, some important parameters must be determined
     firstly in a predictor. For example, the order of the system must be determined at
     advance for an adaptive predictor based on the forward or feedback neural network.
     But it might be difficult or impossible in some cases. Now the new predictor does not
     require deciding on any system parameter. For this reason, it is able to realize system
     modeling, parameter modifying and trends forecasting on line via learning ftom the
     time series of a real dynamic process. This predictor has the advantage in simple
    
     3
    
    
    
     network topology and short learning time. A program of predictive analysis based on
     DRNN is integrated in the monitoring software.
    
     All the theoretical methods proposed in this dissertation have been applied to build
     up an experimental monitor system at the Lab Center of Automatic Marine Engine
     Room in Shanghai Maritime University. The satisfactory results have been obtained by
     the experiments. Such design of the monitor and control system can simplify its
     structure, and enhance its ability of information processing, and promote its reliability
     and flexibility. Besides, this type of monitor system for marine engine room can be
     easily combined with other marine automatic systems to realize the information
     network of the total ship.
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