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A Programmable Wireless Sensing System for Structural Monitoring

A Programmable Wireless Sensing System for Structural Monitoring. Jeongyeup Paek Embedded Networks Laboratory Department of Computer Science University of Southern California. Overview. Wireless sensor network for SHM Tenet System Overview Task and Tasking Library Networking subsystem

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A Programmable Wireless Sensing System for Structural Monitoring

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  1. A Programmable Wireless SensingSystem for Structural Monitoring Jeongyeup Paek Embedded Networks Laboratory Department of Computer Science University of Southern California

  2. Overview • Wireless sensor network for SHM • Tenet System Overview • Task and Tasking Library • Networking subsystem • Real-world deployment experience on a large suspension bridge • Conclusion

  3. Wireless sensor network • Why wireless sensing? • Low cost, • Fast and flexible deployment, • Low maintenance and deployment cost. • Difficulties… • Complexity of the wireless networking system • Little code reuse between applications resulting in increased development time

  4. Tenet • Tiered Embedded Network architecture for future wireless sensor network system • A set of design principles defining what are required from a wireless sensor network system, and where should each functionality reside in such a system. • Two main sub-system: • Tasking Library • Networking Sub-system

  5. Where does Tenet stand? • …in wireless sensing. SHM application and algorithms Networked Software System Hardware and platforms Wireless networking

  6. Tenet • Master • 32-bit processor, • Higher bandwidth radios (IEEE 802.11b), • Larger batteries or possibly powered • Mote • Sensor nodes with • Less capable processors, • Low-power radios (IEEE 802.15.4), • Battery-operated • Allows large-scale, dense sensing

  7. Tenet system Any complicated algorithm or data fusion resides at the master Application run on master and tasks the motes Masters provide generic interface to task the sensors Motes provide limited library of generic functionalities such as timers ,sensors, filters, and other form of local processing Motes responds to the task

  8. Sample MDA400 Detect OnSSet SendStr Sample MDA400 SendStr Tasks and Task Library Sample Sample MDA400 Light NextHop Classify Amplitude Stamp Time Detect OnSet Wait SendStr SendPtr Reset …

  9. Networking Subsystem • Reliable dissemination of tasks • Three different types of transport mechanism for delivering task responses from motes to master • Multi-sink multi-hop tree routing in the mote cloud • IP overlay between masters

  10. Benefits of Tenet • Applications and any intensive or collaborative data processing can run on less-constrained masters, without losing the benefits from wireless sensing. Also, masters provide network capacity scaling. • Networking functionality is generic enough to support various type of applications, and concurrently which improves network re-usability. • Enables significant code re-use across applications.

  11. Overview • Wireless sensor network for SHM • Tenet System Overview • Task and Tasking Library • Networking subsystem • Real-world deployment experience on a large suspension bridge • Conclusion

  12. Master W N 570 ft 120 ft 30 ft Mote Bridge deployment 6000ft long suspension bridge with a main suspension span of 1,500ft, and height of 185ft above water.

  13. Bridge deployment

  14. System Evaluation – packet delivery • 100% reliability with no lost data packets!! • With 26965 packet retransmissions (0.42%) • 2.92% from IEEE 802.11b Master wireless links, and • 97.08% from IEEE 802.15.4 mote wireless links.

  15. Data from the bridge

  16. Conclusion • Generic software system for embedded wireless network of sensors. • An example application for structural monitoring, and it’s deployment experiences. • Thank you…!

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