Design Of Distributed Monitoring Vibration Network System On-line And Its Communication Interface

In order to real-time detect the noise characteristic of the naval vessel vibration,to predict the sound field characteristic on typical navigational status, to monitor therunning conditions of main and auxiliaries and to increase the safety and reliability, itis necessary to mount real-time monitor network for vibration noise on submarines incommission. As Being an advanced technique, field bus is a digital and serial data bus withthe ability of multiple-point communication, which is used widely on industryautomation and process automation and building automation. In this paper, thetechnique of field bus is applied to designed FCS (fieldbus control system). Contrastwith DCS (discrete control system), FCS has these features: complete digitized signaltransmission, thoroughly discrete of control functions and openness and mutualoperation and so on. The CAN bus is selected to compose the network aftercomparison between various field buses. The paper's content is introduced briefly as followed: 1. The concept of field bus and its features is introduced. Various field buses are compared and the CAN bus is selected to compose FCS. 2. The multi-layer distributed network structure model with twisted pair line and optical fibre as transmission medium including central computer, net bridge and measure and process unit, sensors is established, witch has the features of safety, reliability, easy expansion and strong real-time and so on. 3. The real-time measure and process unit with DSP, CPLD and PIC chip as kernel is designed and I2C bus communication interface is developed. 4. The Net bridge of CAN bus is designed including CAN interface and SPI interface. The CAN controller is replaced by MCU with CAN modular in order to optimize the system. 5. Communication interface is tested in order to verify the reliability of data transfer.