Radially sandwiched cylindrical piezoelectric transducer

Lin, Shuyu; Fu, Zhiqiang; Zhang, Xiaoli; Wang, Yong; Hu, Jing

doi:10.1088/0964-1726/22/1/015005

Cited by 41 publications

(38 citation statements)

References 21 publications

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“…Material properties of electrode. 39,41,44,45 Electrode frequency curves can be measured using an impedance analyzer (model: Agilent 4294A), which are plotted in Figure 5. From these curves, the fundamental f r and f a can be obtained, which are further addressed in Table 4 for comparisons.…”

Section: Comparisons With the Experimental Resultsmentioning

confidence: 99%

Effects of electrodes and protective layers on the electromechanical characteristics of piezoelectric stack actuators

Wang

Qin

et al. 2019

Advanced Composites Letters

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Piezoelectric stack actuators are a type of excellent smart devices that can activate large power and displacement outputs due to their unique stack configuration and have been widely used in linear vibrators for various engineering applications. For the fabricated piezoelectric stack actuator, it usually consists of multiple thin piezoelectric wafers, multiple electrodes, and two protective layers. All the piezoelectric wafers are connected electrically in parallel through the electrodes and are protected by two protective layers at the two ends. However, in most of the theoretical models, the active piezoelectric portion is mainly considered, while the electrodes and protective layers are usually neglected to simplify the complicated problem, which results in an inaccurate prediction of the electromechanical characteristics. In our previously published work, the exact theoretical models of the piezoelectric stack energy harvester and sensor with the electrodes and the protective layers included have been established successfully to evaluate the electromechanical performance of these two types of devices, and their validity has verified by the experimental results. However, the exact theoretical model of the piezoelectric stack actuators has not been established, and the effects of the electrodes and the protective layers on the electromechanical characteristics of the actuator are not fully understood. In this article, the exact theoretical model of piezoelectric stack actuator was derived based on our previous work, and the effects of these two factors on the electromechanical characteristics were investigated. Comparisons with the results in the earlier literatures and the experimental results were presented to validate the model. Furthermore, two kinds of typical working states, including clamped–free (C-F) and free–free (F-F), were discussed. The results showed that neglecting the electrodes and the protective layers will greatly affect the accuracy of the prediction model, thus providing some valuable guidelines in designing the piezoelectric stack actuators.

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Section: Comparisons With the Experimental Resultsmentioning

confidence: 99%

Effects of electrodes and protective layers on the electromechanical characteristics of piezoelectric stack actuators

Wang

Qin

et al. 2019

Advanced Composites Letters

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“…The expressions of the impedances are as follows [19][20] , From Figs. 2 and 3, it can be seen that the electromechanical equivalent circuit for a radially polarized piezoelectric ceramic ring is different from that of a thickness polarized piezoelectric ceramic ring.…”

Section: Vibrationmentioning

confidence: 99%

Analysis on the Ring-type Piezoelectric Ceramic Transformer in Radial Vibration

Lin

Cao

2015

IEEE Trans. Power Electron.

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A new type of ring-type piezoelectric ceramic transformer in radial vibration is studied. It is composed of two concentric piezoelectric ceramic thin rings polarized axially and radially. Based on the electromechanical equivalent circuit, when the dielectric loss of the piezoelectric ceramic materials and the mechanical contacting loss between the input and the output piezoelectric rings are taken into account, the electromechanical characteristics of the piezoelectric transformer are studied. The dependency of the voltage gain, the power gain or the efficiency (the ratio of the output power over the input power) and the effective electromechanical coupling coefficient on the geometrical dimensions are analyzed. Meanwhile, the load dependency of the electromechanical parameters of the transformer is also investigated. Some prototypes of the piezoelectric transformers are designed and made. The resonance/anti-resonance frequency and the voltage gain are measured. It is shown that the measured electromechanical parameters are in good agreement with the theoretical results. The conclusions can be used for the optimization design of the ring-type piezoelectric ceramic transformers in the engineering applications.Key words：Piezoelectric ceramic transformer, voltage gain, power gain (efficiency), effective electromechanical coupling coefficient.

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“…Moreover, to reduce costs of the traditional SAs due to cable laying, a Zigbee-based wireless SA sensor is designed for SHM in concrete structures; however, the stress wave is still excited by a traditional wired SA transmitter [73]. Moreover, to better understand the electro-mechanical characteristics of SAs, Wang et al [65] developed a theoretical model to study the performance of the SA with marble protection based on the piezo-elasticity theory [74][75][76][77].…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of a Novel Piezoceramic Stack-based Smart Aggregate

Zhu

Wang

et al. 2020

Sensors

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A novel piezoceramic stack-based smart aggregate (PiSSA) with piezoceramic wafers in series or parallel connection is developed to increase the efficiency and output performance over the conventional smart aggregate with only one piezoelectric patch. Due to the improvement, PiSSA is suitable for situations where the stress waves easily attenuate. In PiSSA, the piezoelectric wafers are electrically connected in series or parallel, and three types of piezoelectric wafers with different electrode patterns are designed for easy connection. Based on the theory of piezo-elasticity, a simplified one-dimensional model is derived to study the electromechanical, transmitting and sensing performance of PiSSAs with the wafers in series and parallel connection, and the model was verified by experiments. The theoretical results reveal that the first resonance frequency of PiSSAs in series and parallel decreases as the number or thickness of the PZT wafers increases, and the first electromechanical coupling factor increases firstly and then decrease gradually as the number or thickness increases. The results also show that both the first resonance frequency and the first electromechanical coupling factor of PiSSA in series and parallel change no more than 0.87% as the Young’s modulus of the epoxy increases from 0.5 to 1.5 times 3.2 GPa, which is helpful for the fabrication of PiSSAs. In addition, the displacement output of PiSSAs in parallel is about 2.18–22.49 times that in series at 1–50 kHz, while the voltage output of PiSSAs in parallel is much less than that in parallel, which indicates that PiSSA in parallel is much more suitable for working as an actuator to excite stress waves and PiSSA in series is suitable for working as a sensor to detect the waves. All the results demonstrate that the connecting type, number and thickness of the PZT wafers should be carefully selected to increase the efficiency and output of PiSSA actuators and sensors. This study contributes to providing a method to investigate the characteristics and optimize the structural parameters of the proposed PiSSAs.

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Radially sandwiched cylindrical piezoelectric transducer

Cited by 41 publications

References 21 publications

Effects of electrodes and protective layers on the electromechanical characteristics of piezoelectric stack actuators

Effects of electrodes and protective layers on the electromechanical characteristics of piezoelectric stack actuators

Analysis on the Ring-type Piezoelectric Ceramic Transformer in Radial Vibration

Design and Analysis of a Novel Piezoceramic Stack-based Smart Aggregate

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