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Smart Structures and Systems
  Volume 11, Number 1, January 2013, pages 87-102

Damage identification using chaotic excitation
Chunfeng Wan, Tadanobu Sato, Zhishen Wu and Jian Zhang

    Vibration-based damage detection methods are popular for structural health monitoring. However, they can only detect fairly large damages. Usually impact pulse, ambient vibrations and sine-wave forces are applied as the excitations. In this paper, we propose the method to use the chaotic excitation to vibrate structures. The attractors built from the output responses are used for the minor damage detection. After the damage is detected, it is further quantified using the Kalman Filter. Simulations are conducted. A 5-story building is subjected to chaotic excitation. The structural responses and related attractors are analyzed. The results show that the attractor distances increase monotonously with the increase of the damage degree. Therefore, damages, including minor damages, can be effectively detected using the proposed approach. With the Kalman Filter, damage which has the stiffness decrease of about 5% or lower can be quantified. The proposed approach will be helpful for detecting and evaluating minor damages at the early stage.
Key Words
    minor damage; damage identification; chaotic excitation; attractor; Kalman Filter
Chunfeng Wan, Tadanobu Sato, Zhishen Wu and Jian Zhang : International Institute for Urban Systems Engineering & School of Civil Engineering, Southeast University, Nanjing 210096, China

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