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The Performance of a Wireless Sensor Network for Structural Health Monitoring

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The Performance of a Wireless Sensor Network for Structural Health Monitoring Jeongyeup Paek, Nupur Kothari, Krishna Chintalapudi, Sumit Rangwala, Ramesh Govindan – PowerPoint PPT presentation

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Title: The Performance of a Wireless Sensor Network for Structural Health Monitoring


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)
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