An Improved Damage Identification Method Using Tunable Piezoelectric Transducer Circuitry

摘要

The objective of this paper is to advance the state-of-art of frequency-shift-based damage identification method using tunable piezoelectric transducer circuitry. More specifically, we aim at improving the current methodology by developing a more accurate and efficient approach. The basic principle of this new approach is to include the high order terms in the eigensolution perturbation formulation, and use an iterative procedure in conjunction with a constrained optimization scheme. In addition, guidelines on how to tune the inductance in the circuit to best capture the damage features are proposed based on a detailed analysis of eigenvalue loci veering and variation of eigenvalue changes with respect to the changing inductance. Results show that more information of the structural damage features can be included in the vector of eigenvalue changes and sensitivity matrices if we tune the inductance inside the eigenvalue veering ranges. Numerical results on identifying single and multiple damages in a cantilever beam example are provided to demonstrate the accuracy of the improved method for structural damage identification.