【作者】 池敏捷；

【导师】 叶声华；

【作者基本信息】 天津大学 ， 测试计量技术及仪器， 2005， 硕士

【摘要】 船舶的振动状况可以用来诊断船舶的设备运行特性,实现对振动状况的监测可以为实时发现故障提供可靠的依据。尤其是对特殊用途的船舶来说,由于振动噪声会影响船舶的声学性能,更是需要对设备的振动噪声进行实时监测,分析和诊断,因此,在船舶上安装振动噪声实时监测网络系统是非常必要的。通讯网络作为数据传输的桥梁,其可靠性直接影响着系统整体运行的可靠性,本文采用控制器局域网CAN总线构成了通讯网络,实现了信号的传输通讯,将传统的集散控制系统DCS转变为现场总线控制系统FCS,其主要特点有:信号传输的全数字化、控制功能的彻底分散、系统具有开放性和互操作性等。自主开发的CAN网桥的使用,可方便的进行网络节点的扩充。本文的主要研究内容有:1、介绍了分布式在线振动监测网络系统的整体设计方案,比较了现场总线控制系统FCS和集散控制系统DCS的优点和缺点,最后选用CAN总线为基础构建通讯网络。2、基于现场总线技术,构建了中央计算机-CAN网桥-测量处理单元-传感器的FCS系统分层网络结构模型。该结构模型具有安全、可靠、扩展简单、实时性强等特点。3、编写了用于系统扩展和上下级之间通讯的CAN网桥的软件程序。包括内部的SPI通讯接口程序及外部CAN通讯接口程序。4、编写了上位机通过CAN接口卡进行通讯的接收和发送程序。5、搭建了用于实验的数据传输通讯网络,通过实验验证了数据传输通讯网络的结构正确性以及软件程序的可行性。更多还原

【Abstract】 The vibrant conditions of a ship can be used to diagnose the operating charactersof the equipments on the ship, monitoring vibration can provide reliable basis to findthe malfunction momentarily. Especially for special functional ship, its acousticcharacteristices may be affected by the vibrant noises so it is necessary to mountreal-time monitor network for vibration noise on ships.As being the bridge of data transmission, the reliability of communicationnetwork directly affect the reliability of the monitoring vibration system. In this peper,The CAN bus is selected to compose the communication network, the FCS (fieldbuscontrol system) is used to take place the conventional DCS (discrete control system).It has the following features: complete digitized signal transmission, thoroughlydiscrete of control functions and openness and mutual operation and so on. Thenetwork nodes can easily be extended by using of CAN bridge.The paper’s content is introduced briefly as followed:1. The overall plan of distributed monitoring vibration network system isintroduced. DCS and FCS are compared and the CAN bus is selected tocompose the communication network.2. The multi-layer distributed network structure model including centralcomputer, net bridge and measure and process unit, sensors is establishedwhich is based on the feildbus technology and has the features of safety,reliability, easy expansion and strong real-time and so on.3. The procedures of the CAN netbridge including internal SPI interfaceprocedure and external CAN interface procedure are programmed.4. The communicate procedure of the certral computer are programmed.5. The experimental data communication network is built, the reliability ofthe network and the feasibility of the procedures are proved through theexperiments.更多还原