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Railway Bridge HealthMonitoring System  A Refined Approach
Design Consideration Easy to Deploy Low Maintenance Long-Term
Application Requirements       30-­‐125m	     3-­‐axis	  accelerometers	  
Application Requirements What to measure? Acceleration in 3-  axis of motion    Frequency components of interest     0.2...
Existing Techniques  Visual inspection  Mostly wired solutions    Equipment is bulky and very expensive    Large setup...
Existing Approaches GSM Data Transmission (Data) Solar Panels (Power) GPS (Time Synchronization) Star Topology (head n...
Star Networks  Central base-station communicates directly to   sensor nodes - Generally mains powered.  All routes are ‘...
Mesh Networks  Full-mesh networks provide fully redundant   routing to the edge of the network.  Increased reliability, ...
Wireless Mesh Network (TSMP) Time Synchronized Mesh Protocol  (TSMP) >99.9% reliability Lowest power per delivered packet
How it Works: CSMA
How it Works: TSMP
Frequency Hopping: CSMA
Frequency Hopping: TSMP
Scalability: CSMA
Scalability: TSMP
Installation (Less work, Less wire,Less conduit…) No Site Survey Installed Like a Wired Device Commissioned Like a Wire...
Maintenance  redictive and timely P indication of failure trends                          Send Maintenance  elivers accu...
25                    Radio Performance           20                                                    X             With...
Train	  Detec+on	  	                  Data	  Uploading	                                         3                         ...
Questions? Jose V. Ortega    817-727-4530    jvortega@sekiur.com
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Railway Bridge Health Monitoring System

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Railway Bridge Health Monitoring System using wireless mesh networks and TSMP.

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Railway Bridge Health Monitoring System

  1. 1. Railway Bridge HealthMonitoring System A Refined Approach
  2. 2. Design Consideration Easy to Deploy Low Maintenance Long-Term
  3. 3. Application Requirements 30-­‐125m   3-­‐axis  accelerometers  
  4. 4. Application Requirements What to measure? Acceleration in 3- axis of motion   Frequency components of interest 0.25-20Hz How long to measure?   40 sec of total vibration during and after train’s passage Time Synchronization   Need accuracy of 5ms
  5. 5. Existing Techniques  Visual inspection  Mostly wired solutions   Equipment is bulky and very expensive   Large setup time (few days) for short-term monitoring  Few wireless solutions   Proprietary non scalable solutions   Wisden (USC)   Golden-gate bridge (UCB)   BriMon
  6. 6. Existing Approaches GSM Data Transmission (Data) Solar Panels (Power) GPS (Time Synchronization) Star Topology (head node) 3   1   2   4   5   6  
  7. 7. Star Networks  Central base-station communicates directly to sensor nodes - Generally mains powered.  All routes are ‘linear’ where each node only has one possible communication path.  The failure of an individual link means that information is lost.  Generally requires site surveys and link-level configuration.  Each node must be positioned correctly and each point-to-point link tuned for maximum reliability.
  8. 8. Mesh Networks  Full-mesh networks provide fully redundant routing to the edge of the network.  Increased reliability, easy network installation and long-term predictability.  Every device has the same routing capabilities.  Lower power consumption.  True self-organising and self-healing without constraints imposed by device type and architecture.  Easy network expansion.
  9. 9. Wireless Mesh Network (TSMP) Time Synchronized Mesh Protocol (TSMP) >99.9% reliability Lowest power per delivered packet
  10. 10. How it Works: CSMA
  11. 11. How it Works: TSMP
  12. 12. Frequency Hopping: CSMA
  13. 13. Frequency Hopping: TSMP
  14. 14. Scalability: CSMA
  15. 15. Scalability: TSMP
  16. 16. Installation (Less work, Less wire,Less conduit…) No Site Survey Installed Like a Wired Device Commissioned Like a Wired Device Operates Like a Wired Device
  17. 17. Maintenance  redictive and timely P indication of failure trends Send Maintenance  elivers accurate and D ONCE to repair … actionable data more effectively than monthly snapshots … Not 20 TIMES to CHECK
  18. 18. 25 Radio Performance 20 X With software: cc2420 10 years  D cellIRX (mA) 15 X 10 cc1000 With software: 5 10 years  coin cell Molnar 04 (0.4mA) Cook 06 (300 µW) X X X Otis 05 (0.4mA) 100k 300k Bit rate (bps) 200k
  19. 19. Train  Detec+on     Data  Uploading   3 6 1 3 2 4 56 1 2 4 5 19  
  20. 20. Questions? Jose V. Ortega   817-727-4530   jvortega@sekiur.com

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