Novel piezoelectric composite spherical cap broadband transducer

Accurate determination of piezoelectric properties such as piezoelectric charge coefficients (d33) is an essential step in the design process of sensors and actuators using piezoelectric effect. In this study, a cost-effective and accurate method based on dynamic loading technique was proposed to determine the piezoelectric charge coefficient d33. Finite element analysis (FEA) model was developed in order to estimate d33 and validate the obtained values with experimental results. The experiment was conducted on a piezoelectric disc with a known d33 value. The effect of measuring boundary conditions, substrate material properties and specimen geometry on measured d33 value were conducted. The experimental results reveal that the determined d33 coefficient by this technique is accurate as it falls within the manufactures tolerance specifications of PZT-5A piezoelectric film d33. Further, obtained simulation results on fibre reinforced and particle reinforced piezoelectric composite were found to be similar to those that have been obtained using more advanced techniques. FE-results showed that the measured d33 coefficients depend on measuring boundary condition, piezoelectric film thickness, and substrate material properties. This method was proved to be suitable for determination of d33 coefficient effectively for piezoelectric samples of any arbitrary geometry without compromising on the accuracy of measured d33.

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Investigation of transient magnetoelectric response of magnetostrictive/piezoelectric composite applicable for lightning current sensing

Sensors and Actuators A Physical ◽

10.1016/j.sna.2021.112789 ◽

2021 ◽

pp. 112789

Author(s):

Hai Zhou ◽

Changbao Xu ◽

Caijiang Lu ◽

Xueling Jiang ◽

Ziyan Zhang ◽

...

Keyword(s):

Piezoelectric Composite ◽

Current Sensing ◽

Lightning Current ◽

Magnetoelectric Response

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An analytical approach to study performance parameters of 1-3 piezoelectric composite

10.1063/5.0039468 ◽

2021 ◽

Author(s):

Sanjeev Kumar Singh ◽

S. K. Panda

Keyword(s):

Analytical Approach ◽

Piezoelectric Composite ◽

Performance Parameters ◽

Study Performance

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A Piezoelectric Wave-Energy Converter Equipped with a Geared-Linkage-Based Frequency Up-Conversion Mechanism

Sensors ◽

10.3390/s21010204 ◽

2020 ◽

Vol 21 (1) ◽

pp. 204

Author(s):

Shao-En Chen ◽

Ray-Yeng Yang ◽

Guang-Kai Wu ◽

Chia-Che Wu

Keyword(s):

Power Generation ◽

Wave Energy ◽

Wave Motion ◽

Wave Energy Converter ◽

Gear Train ◽

Piezoelectric Composite ◽

Maximum Height ◽

Resistive Load ◽

Linkage Mechanism ◽

Energy Converter

In this paper, a piezoelectric wave-energy converter (PWEC), consisting of a buoy, a frequency up-conversion mechanism, and a piezoelectric power-generator component, is developed. The frequency up-conversion mechanism consists of a gear train and geared-linkage mechanism, which converted lower frequencies of wave motion into higher frequencies of mechanical motion. The slider had a six-period displacement compared to the wave motion and was used to excite the piezoelectric power-generation component. Therefore, the operating frequency of the piezoelectric power-generation component was six times the frequency of the wave motion. The developed, flexible piezoelectric composite films of the generator component were used to generate electrical voltage. The piezoelectric film was composed of a copper/nickel foil as the substrate, lead–zirconium–titanium (PZT) material as the piezoelectric layer, and silver material as an upper-electrode layer. The sol-gel process was used to fabricate the PZT layer. The developed PWEC was tested in the wave flume at the Tainan Hydraulics Laboratory, Taiwan (THL). The maximum height and the minimum period were set to 100 mm and 1 s, respectively. The maximum voltage of the measured value was 2.8 V. The root-mean-square (RMS) voltage was 824 mV, which was measured through connection to an external 495 kΩ resistive load. The average electric power was 1.37 μW.

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An enumerative formula for the spherical cap discrepancy

Journal of Computational and Applied Mathematics ◽

10.1016/j.cam.2021.113409 ◽

2021 ◽

Vol 390 ◽

pp. 113409

Author(s):

Holger Heitsch ◽

René Henrion

Keyword(s):

Spherical Cap

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Research and Fabrication of Broadband Ring Flextensional Underwater Transducer

Sensors ◽

10.3390/s21041548 ◽

2021 ◽

Vol 21 (4) ◽

pp. 1548

Author(s):

Jiuling Hu ◽

Lianjin Hong ◽

Lili Yin ◽

Yu Lan ◽

Hao Sun ◽

...

Keyword(s):

High Speed ◽

Structural Parameters ◽

Low Frequency ◽

Flexural Vibration ◽

Underwater Acoustic Communication ◽

Voltage Response ◽

Water Tank ◽

Spherical Cap ◽

Finite Element Software ◽

Underwater Transducer

At present, high-speed underwater acoustic communication requires underwater transducers with the characteristics of low frequency and broadband. The low-frequency transducers also are expected to be low-frequency directional for realization of point-to-point communication. In order to achieve the above targets, this paper proposes a new type of flextensional transducer which is constructed of double mosaic piezoelectric ceramic rings and spherical cap metal shells. The transducer realizes broadband transmission by means of the coupling between radial vibration of the piezoelectric rings and high-order flexural vibration of the spherical cap metal shells. The low-frequency directional transmission of the transducer is realized by using excitation signals with different amplitude and phase on two mosaic piezoelectric rings. The relationship between transmitting voltage response (TVR), resonance frequency and structural parameters of the transducer is analyzed by finite element software COMSOL. The broadband performance of the transducer is also optimized. On this basis, the low-frequency directivity of the transducer is further analyzed and the ratio of the excitation signals of the two piezoelectric rings is obtained. Finally, a prototype of the broadband ring flextensional underwater transducer is fabricated according to the results of simulation. The electroacoustic performance of the transducer is tested in an anechoic water tank. Experimental results show that the maximum TVR of the transducer is 147.2 dB and the operation bandwidth is 1.5–4 kHz, which means that the transducer has good low-frequency, broadband transmission capability. Meanwhile, cardioid directivity is obtained at 1.4 kHz and low-frequency directivity is realized.

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