On the tuning of variable piezoelectric transducer circuitry network for structural damage identification

Enhancing Structural Damage Identification Robustness to Noise and Damping With Integrated Bistable and Adaptive Piezoelectric Circuitry

“…This section reviews the prior development of identifying damage location and severity by the frequency shift-based method using integrated adaptive piezoelectric circuitry for data enrichment, stemming from the work of Jiang et al [12,13]. Readers interested in further model development details should refer to Refs.…”

“…Readers interested in further model development details should refer to Refs. [12] and [13]. Figure 1 shows a schematic of the integrated electromechanical system.…”

“…To address this concern, approaches such as twin structure [10] and mass/stiffness addition [11] have been proposed to lend greater dynamic degrees of freedom to the structural model and reduce the underdetermined formulation of the model solution. Jiang et al [12,13] proposed a form of mass/ stiffness addition by incorporating adaptive piezoelectric circuitry into the structure to enrich the modal frequency measurements. The method introduces additional resonant frequencies and vibration modes to the integrated system and, in contrast to the prior techniques, is easier to implement due to straightforward integration of piezoelectric transducers and circuitry with the structural system.…”

“…By favorably tuning the inductance values in the circuitry, a larger number of frequency responses with increased number of resonance frequency shifts are obtained. The study demonstrated that the enriched data set of resonance frequency shifts improved the ability to solve the inverse problem for accurate damage location and severity identification [12][13][14].…”

“…Therefore, this research aims to develop an easily implemented frequency shift determination technique which does not require active control and is far less susceptible to noise and damping influences. In conjunction with the prior adaptive piezoelectric circuitry [12][13][14], this study investigates a new means for structural damage identification which is found to be notably robust when response signals are distorted due to realistic noise and damping, factors which otherwise degrade the viability of frequency shift determination by traditional peak detection. Although correct frequency shift determination is a principal aim of the proposed alternative approach, this study provides additional focus on the final damage identification as an unambiguous metric of success because reducing error in frequency shift prediction may not correlate to an equally improving identification of damage location and severity.…”