riding the stress wave: integrated monitoring
TRANSCRIPT
Zhou YuanMiao Pan| University of Houston 1
Miao Pan
ECE, University of HoustonCourtesy to UH students, Debing Wei, Li Yan, Steban Soto, Chaoxian Qi, Drs. Jiefu Chen, Aijun Song, and Gangbing Song
Thanks to the support of NSF under grant CNS-1801925
Riding the Stress Wave:
Integrated Monitoring, Communications, and
Networking for Subsea Infrastructure
November 05, 2018
Zhou YuanMiao Pan| University of Houston 2
Outline
Background
Stress Wave Channel Capacity Estimation
Stress Wave Assisted Hybrid Subsea Networks
Stress Wave Platform Development
Conclusion
Zhou YuanMiao Pan| University of Houston 4
BPβs βDeepwater horizonβ oil spill
Fire boat response crews battle the blaze of the off shore oil rig Deepwater
Horizon, in the Gulf of Mexico, April 21, 2010.
Zhou YuanMiao Pan| University of Houston 6
Stress Wave Assisted Communications
Stress Wave Assisted Communications in Subsea Environments
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Sound Propagation Schemes
β’ Spherical Spreading for
Deep Water
π· = ππ πππ°P: transmit power
I: power density
r: transmission range
β’ Cylindrical Spreading for
Shallow Water
π· = ππ ππ―π°H: height from seafloor to surface
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Sound Propagation Schemes
β’ Acoustic wave guide
Stress wave
Acoustic wave
PipeActuator
Spreading loss can be significantly reduced!
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Stress Wave Channel Capacity Estimation
β’ Path loss model
10logππΏ(π, π) = π Β· log(π) + π Β· πΌ(π) + π΄
π¨ππππππππππ ππππ:πππ₯π¨π π»π³(π , π) = π. ππππππ
πͺππππππ πͺπππππππ
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Testbed
Stress Wave Actuator
Acoustic Modem
MSP 432
USRP
Water Tank
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Dispersion analysis for pipe geometry
Group Velocity Dispersion Curves
Alleyne, D. N., and P. Cawley. "The excitation of Lamb waves in pipes using dry-coupled piezoelectric
transducers." Journal of Nondestructive Evaluation 15.1 (1996): 11-20
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Pulse Position Modulation (PPM)
Resonance Frequency: 17-21 kHz
Static Capacitance: 1000Β±20% pf
Resonance Frequency: 17-21 kHz
Electromechanical Coupling Coefficient: 0.52
Size (ODΓIDΓH): 53Γ 46Γ41
mm
For encoded pulses sending
For cyclical pulses sending
Eight piezoelectric ceramic
plates in parallel with
tangential polarization.
Coding format
Correlation analysis
Channel
π(π‘) β(π‘) π¦(π‘)
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Experiment for PPM
1. Input β00β to send
an impulse
2. Cyclically send
pulses
3. Input β01β to send
an encoded pulse
sequence
Channel impulse
response
Received waveform
Received waveform
Correlation
analysis
Correlation
analysis
Zhou YuanMiao Pan| University of Houston 25
Conclusions
β’ The offshore infrastructures can be leveraged for stress wave communications.
β’ Combining different types of communication techniques can significantly enhance network performance in subsea environments.