In this paper, the concept of electromechanical impedance instrumented piezoelectric ring was proposed based on the degenerated multilayer piezoelectric/elastic ring transducer. The innovative application of such transducer for two typical issues, including pipe corrosion and bearing wear monitoring, was demonstrated. Two types of simplifications, the metal/piezoelectric ring transducers (I-type) and the piezoelectric/metal ring transducers (II-type), were presented to describe these problems. The corresponding theoretical models were given based on our previously developed multilayered piezoelectric/elastic ring model, and the results were validated through experimental studies. It is concluded that wall thickness change in the pipe or the bearing induce a shift in the peak and valley frequencies in the impedance spectra. The present work demonstrates the feasibility of using electromechanical impedance instrumented piezoelectric ring for pipe corrosion and bearing wear monitoring.

本文基于退化的多层压电/弹性环传感器提出了机电阻抗式压电环的概念。演示了这种传感器在两个典型问题上的创新应用，包括管道腐蚀和轴承磨损监测。提出了两种简化形式，金属/压电环式换能器（I型）和压电/金属环式换能器（II型）来描述这些问题。根据我们先前开发的多层压电/弹性环模型，给出了相应的理论模型，并通过实验研究验证了结果。结论是，管道或轴承中壁厚的变化会引起阻抗谱中峰值和谷值频率的偏移。