Structural Engineering and Mechanics

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Damage index sensor for smart structures

  • Mita, Akira (Department of System Design Engineering, Keio University) ;
  • Takahira, Shinpei (Department of System Design Engineering, Keio University)
  • Received : 2003.02.26
  • Accepted : 2003.05.08
  • Published : 2004.03.25
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Abstract

A new sensor system is proposed for measuring damage indexes. The damage index is a physical value that is well correlated to a critical damage in a device or a structure. The mechanism proposed here utilizes elastic buckling of a thin wire and does not require any external power supply for memorizing the index. The mechanisms to detect peak strain, peak displacement, peak acceleration and cumulative deformation as examples of damage indexes are presented. Furthermore, passive and active wireless data retrieval mechanisms using electromagnetic induction are proposed. The passive wireless system is achieved by forming a closed LC circuit to oscillate at its natural frequency. The active wireless sensor can transmit the data much further than the passive system at the sacrifice of slightly complicated electric circuit for the sensor. For wireless data retrieval, no wire is needed for the sensor to supply electrical power. For the active system, electrical power is supplied to the sensor by radio waves emitted from the retrieval system. Thus, external power supply is only needed for the retrieval system when the retrieval becomes necessary. Theoretical and experimental studies to show excellent performance of the proposed sensor are presented. Finally, a prototype damage index sensor installed into a 7 storey base-isolated building is explained.

Keywords

References

  1. Casciati (Editor) (2003), Proceedings of the Third World Conference on Structural Control, John Wiley & Sons.
  2. Conner, J. (2002), Introduction to Structural Motion Control, Prentice Hall.
  3. Connor, J.J., Wada, A., Iwata, M. and Huang, Y.H. (1997), "Damage-controlled structures. I: Preliminary designmethodology for seismically active regions", J. Struct. Eng., 123(4), 423-431. https://doi.org/10.1061/(ASCE)0733-9445(1997)123:4(423)
  4. Finkenzeller, K. (2000), RFID Handbook : Radio-Frequency Identification Fundamentals and Applications, JohnWiley & Sons, Inc.
  5. Kakizawa, T. and Ohno, S. (1996), "Utilization of shape memory alloy as a sensing material for smartstructures", Proc. Advanced Composite Materials in Bridges and Structures, 67-74.
  6. Matsubara, H., Shin, S.-G., Okuhara, Y., Nomura, H. and Yanagida, H. (2001), "Application of the self-diagnosiscomposite into concrete structure", Proc. SPIE, 4234, 36-43.
  7. Mita, A. (1999), "Emerging needs in Japan for health monitoring technologies in civil and building structures",Proc. Second International Workshop on Structural Health Monitoring, Stanford University, 56-67.
  8. Muto, N., Yanagida, H., Nakatsuji, T., Sugita, M., Ohtsuka, Y. and Arai, Y. (1992), "Design of intelligentmaterials with self-diagnosing function for preventing fatal fracture", Smart Materials and Structures, 1, 324-329. https://doi.org/10.1088/0964-1726/1/4/007
  9. Naeim, F. and Kelly, J.M. (1999), Design of Seismic Isolated Structures from Theory to Practice, John Wiley &Sons, Inc.
  10. Okuhara, Y., Shin, S.-G., Matsubara, H., Yanagida, H. and Takeda, N. (2001), "Development of conductive FRPcontaining carbon phase for self-diagnosis structures", Proc. SPIE, 4328, 314-322.
  11. Westermo, B.D. and Thompson, L. (1994), "Smart structural monitoring: A new technology", InternationalJournal of Sensors, 15-18.

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