Experimental study on working performance of stacked piezoelectric smart aggregate based on piezoelectric admittance

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (11) : 9-18.

LAN Chengming1, LIU Honghui1, WANG Jianjun2, LI Weijie3

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Abstract

The smart aggregate based on piezoelectric stacks is a new type of transducer, which usually use piezoelectric stacks as the core element. Compared with traditional smart aggregates, it has superior electromechanical coupling performance, which can effectively improve the accuracy and reliability of structural damage diagnosis and has important application prospects in the field of structural health monitoring. However, the current study mainly focused on the device design and theoretical modeling, the device performance based on electromechanical admittance needs to be further evaluated. A temperature-sensitive experiment was designed to analyze the variation of the resonant frequencies of the device under temperature gradient; a 28-day water immersion experiment was carried out to plot the variation of the resonant frequencies of the device with the number of water immersion days; three soil specimens with dimensions of 200 mm 200 mm 200 mm were prepared, and the devices were embedded into the soil specimens to conduct water content monitoring experiment. The water contents of the soil specimens were monitored by the quantitative indicators under different water contents. The results show that the resonance frequencies of the smart aggregates based on piezoelectric stacks decrease linearly with the increase of temperature; the maximum shift of the resonance frequencies do not exceed 10% during 28 days of water immersion, indicating good stability; the quantitative indicators calculated based on admittance signals all increase with the increasing moisture content of the soil specimens, which can effectively monitor the changes in soil moisture content.

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smart aggregates based on piezoelectric stacks / temperature sensitivity / electromechanical admittance / quantitative indicators / stability

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LAN Chengming1, LIU Honghui1, WANG Jianjun2, LI Weijie3. Experimental study on working performance of stacked piezoelectric smart aggregate based on piezoelectric admittance[J]. Journal of Vibration and Shock, 2024, 43(11): 9-18

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