测控技术及仪器专业导论PPT.ppt

Continuous stress monitoring - post tensioned cable EM sensor 1 12 24 1 12 24 9:30AM,DEC2409:30AM,DEC25_04, 09:30AM,JAN0509:30AM,JAN06_05 Tension measurement Temperature reading Stress Monitoring – Hanger cable (JAN05~JAN06, 2005) EM sensor For hanger cables, tension fluctuation is mainly caused by traffic Temperature contraction of the cable can only lead to a tension variation no high than ~-2.4Mpa /°C 炼铁 土建结构 航空航天 机械结构 其他应用 结构健康监测（Structure health monitoring） Ground sea of Indian Ocean Hengyang conflagration in 11.3，2003 rainbow bridge in chongqing ,die 40，1996 Roissy Charles-de-Gaulle Airport in France in 5,23,2004 Yanan Baota dam,5.12,2003 2002-6-9 xian bahe rail bridge 2002-8-27 Taiwan gaoping bridge Question why？ How to avoidance by technique ？ Rule Layout Design Monitoring …… Structure health monitoring 方法（Approach ） 技术方法（Technique approach ） 24hr monitor?Data collection?Record ?Analyze ? Processing ?diagnoses Sensor＋ Data collection ＋Data-base＋Data analyse＋Decision-making system Speciality＋I T technique 传感器（Sensor ） Rust sensor Steel rust + Cl-+ temperature + humidity complex Sensor Simulation experiment 光纤光栅传感器（Fiber Grating Sensors） Strain Temperature Attatched to the structure Sensor Fiber strain Sensor EM Sensor 数据采集系统（Data collection system） 形式（Form）：distributed 通讯（Communication）：wire、wireless 总线（Bus）：PXI、PCI、Fieldbus…… 协议（Agreement）：TCP/IP、OPC…… 数据库（Data-base） Oracle SQL Server 2000 Informix Sybase Interbase MySql Progest…… Sunshine Skyway Bridge, Florida, USA 应用（Applying） Tsing Ma, Hong Kong 苏通大桥（主跨1088米，塔高300.4米，最长索长577米（59吨）） On-line health monitoring room Sensor lay EM Sensor Technology Sensor Sizes – 7mm to 250mm Main Board Capacitor Bank H-Voltage Power Source AC/DC Power Source Interface To Laptop Power Stress Calibration Unit 16 Channels Power Stress Unit Calibration at UIC Inside: 16CH Power Stress Unit U-shape E