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Design of wireless sensor network and its application for structural health monitoring of cable-stayed bridge

  • Lin, H.R. (Institute of Applied Mechanics, National Taiwan University) ;
  • Chen, C.S. (Department of Civil Engineering, National Taiwan University) ;
  • Chen, P.Y. (Department of Engineering Science and Ocean Engineering, National Taiwan University) ;
  • Tsai, F.J. (Institute of Applied Mechanics, National Taiwan University) ;
  • Huang, J.D. (Institute of Applied Mechanics, National Taiwan University) ;
  • Li, J.F. (Department of Civil Engineering, National Taiwan University) ;
  • Lin, C.T. (Graduate Institute of Electronics Engineering, National Taiwan University) ;
  • Wu, W.J. (Department of Engineering Science and Ocean Engineering, National Taiwan University)
  • Received : 2009.11.18
  • Accepted : 2010.03.08
  • Published : 2010.11.25

Abstract

A low-cost wireless sensor network (WSN) solution with highly expandable super and simple nodes was developed. The super node was designed as a sensing unit as well as a receiving terminal with low energy consumption. The simple node was designed to serve as a cheaper alternative for large-scale deployment. A 12-bit ADC inputs and DAC outputs were reserved for sensor boards to ease the sensing integration. Vibration and thermal field tests of the Chi-Lu Bridge were conducted to evaluate the WSN's performance. Integral acceleration, temperature and tilt sensing modules were constructed to simplify the task of long-term environmental monitoring on this bridge, while a star topology was used to avoid collisions and reduce power consumption. We showed that, given sufficient power and additional power amplifier, the WSN can successfully be active for more than 7 days and satisfy the half bridge 120-meter transmission requirement. The time and frequency responses of cables shocked by external force and temperature variations around cables in one day were recorded and analyzed. Finally, guidelines on power characterization of the WSN platform and selection of acceleration sensors for structural health monitoring applications were given.

Acknowledgement

Supported by : National Science Council (NSC) in Taiwan

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