基于压电导纳的叠堆型压电智能骨料工作性能实验研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (11) : 9-18.

论文

兰成明1，刘鸿辉1，王建军2，李伟杰3

作者信息 +

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

LAN Chengming1, LIU Honghui1, WANG Jianjun2, LI Weijie3

Author information +

文章历史 +

摘要

叠堆型压电智能骨料是一种以压电叠堆为核心元件制备的新型换能器。相比于传统的智能骨料，它有着更优异的力电耦合性能，可有效提高结构损伤诊断的精度和可靠性，在结构健康监测领域有重要的应用前景。但是，目前主要侧重于器件的设计和理论建模，基于压电导纳的器件工作性能还需进一步评估。设计了温度敏感性实验，分析了器件的谐振频率在温度梯度下的变化规律；开展了28天的浸水实验，绘制了器件谐振频率随浸水天数的变化曲线；制备了三个200 mm×200 mm×200 mm土体试件，并将器件嵌入到土体试件中开展含水率的监测实验，通过分析不同含水率下的量化指标对土体含水状态进行监测。研究结果表明，叠堆型压电智能骨料的谐振频率随温度的升高而线性下降；在28天浸水过程中，谐振频率的最大偏移率不超过10%，稳定性良好；基于导纳信号计算得到的量化指标均随土体试件含水率的升高而增大，可有效监测土体含水率的变化。

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.

导出引用

兰成明1，刘鸿辉1，王建军2，李伟杰3. 基于压电导纳的叠堆型压电智能骨料工作性能实验研究[J]. 振动与冲击, 2024, 43(11): 9-18

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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