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Wireless Sensor Networks for Structural Health Monitoring

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Vertical, Quarter span. North of the South Tower (b) Vertical, Quarter span. South of the North Tower. Vibration Data from the Footbridge ... – PowerPoint PPT presentation

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Title: Wireless Sensor Networks for Structural Health Monitoring


1
Wireless Sensor Networks for Structural Health
Monitoring
Sukun Kim, Shamim Pakzad, David Culler, James
Demmel, Gregory Fenves, Steve Glaser, Martin
Turon
EECS, UC Berkeley CEE, UC Berkeley
Crossbow
Overview
Vibration Data from the Footbridge
  • Ambient vibrations of the structure are
    monitored and used to determine the health status
    of the structure.
  • With a Wireless Sensor Network, low cost
    monitoring is possible without interfering with
    the operation of the structure.

First Vertical Mode of Vibration
Challenges
  • High Fidelity Data
  • High Frequency Sampling with Low Jitter
  • Time Synchronized Sampling FTSP
  • Large-scale Multi-hop Network Mint
  • Reliable Command Dissemination Broadcast
  • Reliable Data Collection Straw

Accelerometer Board
Estimated results match with a FE model of the
bridge (SAP)
Deployment at the Golden Gate Bridge
  • Two measurement axis each with two
    accelerometers
  • Thermometer, 16bit ADC, Low-pass filter
  • On-board Digital Signal processing
  • Calibration for manufacturing variation and
    temperature
  • Nodes on the main span and the south tower
  • Distance between nodes on the west span is
    either 100ft or 50ft
  • Exposed to strong and salty wind and fog

Software Architecture
  • When sampling, only necessary components are
    turned on to reduce jitter
  • Straw provides reliable data collection
  • Selective-NACK is used complexity is drawn
    from the sender (mote) to the receiver (PC)
  • Rate-based control
  • Pipelining increases channel utilization

Node, Battery, Antenna
Rusting of C-clamp
Base station in Tower
Deployment at the Footbridge
  • Vertical, Quarter span
  • North of the South Tower

(b) Vertical, Quarter span South of the North
Tower
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