Identification of Mechanical Pre-Stressing Degradation in Piezoelectric Transducers

Jaqueline Rohvedder de Oliveira, F. Arnold
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Abstract

The degradation of the mechanical pre-stressing in piezoelectric transducer is a drawback that reduces the performance of these devices. The behavior of the transducer is affected by the pre-stress and can be identified through of the impedance curves, mostly by the resonance deviations. In this work, we have proposed a circuit that allow us to know if the pre-stress is kept at a suitable level after the transducer operation. This circuit works based on the relation of pre-stress to phase difference between voltage and current in the transducer. The circuit provides an electric signal whose duty cycle and the average voltage can be used to identify small variations of pre-stress. The tests were conducted in three transducers originally pre-stressed at a reference level (52.8 MPa). Afterwards, the pre-stressing was deliberately degraded in 8.1 MPa and the tests repeated. The sensitivity of the system was around 0.23 V/MPa. The circuit is simple, low cost and can be used out of specialized laboratories.
压电换能器机械预应力退化的辨识
压电换能器中机械预应力的退化是降低其性能的一个缺点。换能器的性能受预应力的影响,可以通过阻抗曲线来识别,主要是通过谐振偏差来识别。在这项工作中,我们提出了一种电路,使我们能够知道在换能器操作后预应力是否保持在合适的水平。该电路的工作原理是基于传感器中预应力与电压、电流相位差的关系。电路提供一个电信号,其占空比和平均电压可以用来识别预应力的小变化。试验在三个传感器中进行,传感器最初在参考水平(52.8 MPa)下进行预应力。随后,在8.1 MPa下故意降低预应力,重复试验。该系统的灵敏度约为0.23 V/MPa。该电路简单,成本低,可以在专门的实验室外使用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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