Li Yinong  Zheng Ling  Chen Bingkui

State Key Laboratory of Mechanical Transmission, Chongqing University,

Chongqing 400044, China

Wen Bangchun

 Northeastern University

Abstract:  A dynamic impedance-based structural health monitoring technique is introduced. According to the direct and the converse piezoelectric property of piezoelectric materials, the piezoceramic ( PZT ) can be used as an actuator and a sensor synchronously. If damages like cracks, holes, debonding or loose connections are presented in the structure, the physical variations of the structure will cause the mechanical impedance modified. On the basis of introducing the principle and the theory, the experiment and the analysis on some damages of the structure are studied by means of the dynamic impedance technique. On the view of experiment, kinds of structural damages are evaluated by the information of dynamic impedance in order to validate the feasibility of the method.

Key words: Dynamic impedance  PZT  Structural damage  Health monitoring

* This project is supported by Foundation of Study Abroad Returnee, Ministry of Education of China (No. 2000-367), and Open Foundation of the State Key Laboratory of VSN, Shanghai Jiaotong University, China (No. VSN-2001-03). Received February 12, 2001; received in revised form August 28, 2001; accepted January 20, 2002

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