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Tales in Embedded Sensing. Derek Skolnik, Martin Lukac V. Naik, W. Kaiser, P. Davis, J. Wallace, D. Estrin. STORIES. 50 - 70 40 - 50 20 - 40. Tall Building Boom Performance-based “alternative” designs require peer review per UBC 97 Update LA-DBS instrumentation requirements. Saw cuts.

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Tales in Embedded Sensing

Derek Skolnik, Martin Lukac

V. Naik, W. Kaiser, P. Davis, J. Wallace, D. Estrin


STORIES

50 - 70

40 - 50

20 - 40

  • Tall Building Boom

  • Performance-based “alternative” designs require peer review per UBC 97

  • Update LA-DBS instrumentationrequirements


Saw cuts

I-35W Bridge Collapse

N

  • Structural Health Monitoring

  • Rapid post-event assessment

    • minimize downtime

  • Damage Detection

    • need more than acceleration


Sensors

  • Suite

  • Interstory displacement

ENSBox

  • Time synchronization

  • Robust WLAN

Algorithms

  • Damage detection

  • Post-event assessment


  • Sensor Development

  • Two approaches used to measure interstory displacements

    • double integration of acceleration

    • LVDT with spring tensioned wire

  • New non-contact sensor

LVDT

Laser

Plano-convex lens

Accelerometer

Photodiode



SHMnet

GeoNet standing up

  • System shared with GeoNet

  • Difference: deployment scenarios and sensors

  • Rapidly deployed after earthquakes

  • 0.5 – 1.0 Km grid

  • Active >= month


Frequency of aftershocks determined by size of initial shock (Omori’s Law)

Small EQ -> aftershocks for a few weeks

Large EQ -> aftershocks for a few years

Opportunity to study earthquake propagation near epicenter

GeoNet: Aftershock Chaser . . .


MASE (Omori’s Law)& Peru vs GeoNet

  • Short term – smaller batteries

  • Integrated low power ADC

  • Passive seismometer

  • LEAP2 platform

  • Sleep scheduling

  • Long term

  • Big batteries

  • Solar panels

  • Power hungry ADC

  • Active seismometer

30+ days

5 days


Sleep Scheduling: (Omori’s Law)

Impact on the Entire System

Data Transport / Routing

  • Preserve routes between sleep cycles

  • Aggressive route repair after wake up

Time Synchronization

  • Maintain sync across sleep cycles

  • Most important when no GPS available

System Management

  • Disruption Tolerant Shell (DTS)

  • Used in MASE network, applicable here

Deployment

  • Determine network capacity as deploying

  • Bound on sleep scheduling


Thank You (Omori’s Law)

Please visit our poster


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