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Smart Structures and Systems Volume 4, Number 3, May 2008 , pages 305-318 DOI: https://doi.org/10.12989/sss.2008.4.3.305 |
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Autonomous hardware development for impedance-based structural health monitoring |
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Benjamin L. Grisso and Daniel J. Inman
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| Abstract | ||
| The development of a digital signal processor based prototype is described in relation to continuing efforts for realizing a fully self-contained active sensor system utilizing impedance-based structural health monitoring. The impedance method utilizes a piezoelectric material bonded to the structure under observation to act as both an actuator and sensor. By monitoring the electrical impedance of the piezoelectric material, insights into the health of the structured can be inferred. The active sensing system detailed in this paper interrogates a structure utilizing a self-sensing actuator and a low cost impedance method. Here, all the data processing, storage, and analysis is performed at the sensor location. A wireless transmitter is used to communicate the current status of the structure. With this new low cost, field deployable impedance analyzer, reliance on traditional expensive, bulky, and power consuming impedance analyzers is no longer necessary. A complete power analysis of the prototype is performed to determine the validity of power harvesting being utilized for self-containment of the hardware. Experimental validation of the prototype on a representative structure is also performed and compared to traditional methods of damage detection. | ||
| Key Words | ||
| structural health monitoring; impedance method; damage detection; digital signal processor; wireless monitoring; wireless sensing unit. | ||
| Address | ||
| Center for Intelligent Material Systems and Structures, Virginia Polytechnic Institute and State University,310 Durham Hall Mail Code 0261, Blacksburg VA 24061, USA | ||