1 / 18

The Performance of a Wireless Sensor Network for Structural Health Monitoring

The Performance of a Wireless Sensor Network for Structural Health Monitoring. Jeongyeup Paek, Nupur Kothari, Krishna Chintalapudi, Sumit Rangwala, Ramesh Govindan Embedded Networks Laboratory, USC. Overview of Wisden. Wisden.

lluvia
Download Presentation

The Performance of a Wireless Sensor Network for Structural Health Monitoring

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Performance of a Wireless Sensor Network for Structural Health Monitoring Jeongyeup Paek, Nupur Kothari, Krishna Chintalapudi, Sumit Rangwala, Ramesh Govindan Embedded Networks Laboratory, USC

  2. Overview of Wisden

  3. Wisden • A wireless multi-hop sensor network based data acquisition system for structural health monitoring • Features • Time-synchronized data delivery from multiple sensor nodes • Reliable data delivery over multiple hops with tolerable latencies • Ease and flexibility of deployment

  4. Wisden (cont’) • Hardware • Mica-2 mote • Vibration card : 4-channel, 16-bit ADCs • Accelerometer : tri-axis (-2.5g ~ 2.5g) • Reliability • Application layer NACK mechanism • Hop-by-hop and end-to-end loss recovery over self-configured tree topology

  5. Wisden (cont’) • Data Compression • Lossy run-length encoding for silence suppression • Required to handle the large data volume • Data Synchronization • Calculate residence time of a packet within each node • Time-stamp data at the base station (possibly with GPS)

  6. Four Seasons Building

  7. Four Seasons Buildingand Eccentric mass shaker

  8. Wisden deployment • Setup • 10 motes in 90’ X 180’ area on the fourth floor of the building • Four nodes co-located with the wired instruments • Tri-axis, with 50Hz sampling rate for each channel • 0.5 packets/sec transmission rate

  9. Deployment experiences • High packet loss rate • Delivery rate as low as 37.6% for some links • Multi-hop network • Maximum of 4-hop paths • Frequent route changes • Increased delay for packet loss recovery • Ambient noise • Human movements, power generator • Interference with other wired/wireless devices

  10. Results

  11. Results (cont’)

  12. Problems • Lossy Run-length compression • Loss of high-frequency components of data • Time-synchronization • Adjusting time takes time • …with GPS at the base station • Software bug • Counter wrap-around problem

  13. Seismic Test Structure • Full-scale realistic model of hospital ceiling • Located in the civil engineering building at USC

  14. Results

  15. Results (cont’)

  16. Results (cont’)

  17. Conclusion • Our deployments indicate that Wisden can deliver time-synchronized data reliably across multiple hops with tolerable latencies. • However, a number of improvements can be made. • Lossless compression • Time synchronization

  18. Reference • A Wireless Sensor Network for Structural Monitoring, • Ning Xu, Sumit Rangwala, Krishna Chintalapudi, Deepak Ganesan, Alan Broad, Ramesh Govindan, Deborah Estrin, In Proceedings of the ACM Conference on Embedded Networked Sensor Systems, November 2004 • The Performance of a Wireless Sensor Network for Structural Health Monitoring, • Jeongyeup Paek, Nupur Kothari, Krishna Chintalapudi, Sumit Rangwala, Ning Xu, John Caffrey, Ramesh Govindan, Sami Masri, and Daniel Whang, submitted 2nd European Workshop on Wireless Sensor Networks (EWSN 2005)

More Related