1 Design of a Low-Power Wireless Structural Monitoring System for Collaborative Computational Algorithms Yang Wang, Prof. Kincho H. Law Department of Civil.

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1 Design of a Low-Power Wireless Structural Monitoring System for Collaborative Computational Algorithms Yang Wang, Prof. Kincho H. Law Department of Civil and Environmental Engineering, Stanford University Prof. Jerome P. Lynch Department of Civil and Environmental Engineering, University of Michigan SPIE, San Diego, CA, March 6, 2005

2 Agenda Research background Hardware design of the latest wireless sensing unit prototype Software design of the latest wireless SHM system Large-scale field validation tests Future direction

3 Agenda Research background Hardware design of the latest wireless sensing unit prototype Software design of the latest wireless SHM system Large-scale field validation tests Future direction

4 Structural Health Monitoring (SHM) S. Chase (2001), NBIP Report: Nearly 60,000 bridges in U.S. evaluated as structurally deficient. Over 580,000 highway bridges in U.S. mandated for biannual evaluations. Advanced Sensing Technology for Autonomous SHM: Rapid, accurate, low-cost

5 From Wire-based Sensing to Wireless Sensing E. G. Straser, and A. S. Kiremidjian (1998): Installation of wired system can take about 75% of testing time M. Celebi (2002): Each sensor channel and data recording system: $2,000; Installation (cabling, labor, etc.) per wired channel: $2,000. Traditional DAQ System: wire-based Future Wireless DAQ System Wireless SHM prototype system Jointly developed by researchers in Stanford University and the University of Michigan

6 Challenges in Wireless Structural Sensing (1) Requirements for long-distance high-speed wireless data acquisition, and extensive local data processing HIGHER PERFORMANCE LOWER POWER

7 Challenges in Wireless Structural Sensing (2) Hardware  Restricted communication range  Limited bandwidth  Unreliable wireless transmission Software  Difficulty for data synchronization  Difficulty for robust communication design Background → Sensing → Control → Summary

8 Dr. E. G. Straser, Prof. A. Kiremidjian (1998) Dr. J. P. Lynch, Prof. K. H. Law et al. (2002) Y. Wang, Prof. J. P. Lynch, Prof. K. H. Law (2005) Wireless SHM Unit Prototypes from Stanford and UMich L. Mastroleon, Prof. A. Kiremidjian et al (2004)

9 Agenda Research background Hardware design of the latest wireless sensing unit prototype Software design of the latest wireless SHM system Large-scale field validation tests Future direction

10 Picture of the Prototype with Wireless Modem

11 Atmega128 Micro-controller Sensor Connector 4 Channel, 16-bit A2D Converter Address Latch for the External Memory 128kB External Memory Power Switch Connector to Wireless Modem Prototype Double-layer Circuitry Board

12 Container Dimension 4.02” x 2.56” x 1.57” (10.2cm x 6.5cm x 4.0cm) Antenna Length: 5.79” (14.7cm) Wireless Sensing Unit Prototype Package Power supply requirement: 5.2V

13 Power consumption: 75 – 80mA when active; 0.1mA standby Communication range: 90m indoor, 300m outdoor 16bit Analog-To-Digital conversion, 4 A2D channels Local data processing Point-to-multipoint, and peer-to-peer communication Low hardware cost Hardware Performance Summary

14 Agenda Research background Hardware design of the latest wireless sensing unit prototype Software design of the latest wireless SHM system Large-scale field validation tests Future direction

15 Wireless Sensing Network Prototype system: simple star topology network Firmware for wireless sensing units Server-side computer software

16 Reliable Beacon Signal Synchronization Protocol

17 Agenda Research background Hardware design of the latest wireless sensing unit prototype Software design of the latest wireless SHM system Large-scale field validation tests Future direction

18 Geumdang Bridge Test, Korea 46.0m18.7m

19 Bridge Traffic Excitation

20 Sensor Property PCB Piezoelectric (Cable System) PCB MEMS Capacitive (Wireless System) Maximum Range1 g3 g Sensitivity10 V/g0.7 V/g Bandwidth2000 Hz80 Hz RMS Resolution (Noise Floor) 50  g 0.5 mg Wire-based System versus Wireless System Sampling Frequency 200Hz70Hz

21 Time History Comparison Between Two Systems Wireless System Wire-based System Difference in sensors and signal conditioning

22 Comparison of FFT Results Wireless System Wire-based System

23 Validation Results Summary Rapid installation, and low cost Communication range: 50 – 60m in box girder Networked real-time and non-stopping data collection: up to 24 wireless sensors at 50Hz sampling frequency Data is near-synchronized: modal analysis Local data processing capability: 4096-pt FFT by wireless sensing unit

24 Agenda Research background Hardware design of the latest wireless sensing unit prototype Software design of the latest wireless SHM system Lab validation tests Large-scale field validation tests Future direction

25 Future Direction To be improved for current prototype system: Sensor signal conditioning Greater wireless communication range, higher data rate Large-scale data collection from densely allocated sensors Local data analysis and damage identification algorithm

26 Acknowledgement National Science Foundation CMS and CMS The Office of Technology Licensing Stanford Graduate Fellowship The University of Michigan Rackham Grant and Fellowship Program Prof. Chung Bang Yun, Prof. Jin Hak Yi, and Mr. Chang Geun Lee, at the Korea Advanced Institute of Science and Technology (KAIST) Prof. Law, Prof. Kiremidjian and Prof. Miranda

27 The End