scholarly journals Impact-Based Amplification and Frequency Down-Conversion of Piezoelectric Actuation for Small Robotics

2021 ◽  
Vol 11 (14) ◽  
pp. 6276
Author(s):  
Congkai Shen ◽  
Siyuan Yu ◽  
Junjie Luo ◽  
Kenn R. Oldham
Keyword(s):  
Lead Zirconate Titanate ◽  
Low Frequency ◽  
Lead Zirconate ◽  
Prototype System ◽  
Piezoelectric Actuation ◽  
Output Frequency ◽  
Frequency Output ◽  
Amplification Mechanism ◽  
Dynamic Amplification ◽  
Down Conversion

This paper explores a concept for dynamic amplification of piezoelectric actuator motion using repeated impacts between the active transducer and a compliant amplification mechanism. The design shows good performance in amplifying vibration of a lead–zirconate–titanate (PZT) bimorph while down-converting the output frequency of motion from more than 150 Hz to less than 20 Hz. A simple dynamic model is used to identify the conceptual opportunities for impact-based amplification of PZT displacement. Experimental results are gathered from a prototype system with dimensions 55 mm × 22 mm × 1 mm. PZT displacement is amplified by a factor of more than 100 with near-periodic output oscillations at select input frequencies. Implications for leveraging the low-frequency output oscillations in small mobile robots are briefly discussed.

scholarly journals SIMULATION AND ANALYSIS OF DIFFERENT PIEZOELECTRIC MATERIALS IN MEMS CANTILEVER FOR ENERGY HARVESTING

2021 ◽  
Vol 9 (1) ◽  
pp. 1321-1328
Author(s):  
Abdul Aziz Khan J , Shanmugaraja P , Kannan S
Keyword(s):  
Energy Harvesting ◽  
Lead Zirconate Titanate ◽  
Piezoelectric Materials ◽  
Low Frequency ◽  
Lead Zirconate ◽  
Vital Role ◽  
Von Mises Stress ◽  
And Performance ◽  
Von Mises ◽  
Implantable Sensor

MEMS Energy Harvesting(EH) devices are excepted to grow in the upcoming years, due to the increasing aspects of MEMS EH devices in vast applications. In Recent advancements in energy harvesting (EH) technologies wireless sensor devices play a vital role to extend their lifetime readily available in natural resources. In this paper the design of MEMS Cantilever at low frequency (100Hz) with different piezoelectric materials Gallium Arsenide (GaAs), Lead Zirconate Titanate (PZT-8), Tellurium Dioxide (TeO2), Zinc oxide (ZnO) is simulated and performance with different materials are compared. The results are analyzed with various parameters such as electric potential voltage, von mises stress, displacement. The paper discusses the suitability of the piezoelectric material for MEMS fully cochlear implantable sensor application.

Fabrication of Thick, Sol Gel Pzt Films: Applications to Macroscopic Piezoelectric Devices

1994 ◽  
Vol 360 ◽  
Author(s):  
D.A. Barrow ◽  
T.E. Petroff ◽  
M. Sayer
Keyword(s):  
Lead Zirconate Titanate ◽  
Sol Gel ◽  
Low Frequency ◽  
Lead Zirconate ◽  
Resonant Vibrations ◽  
Pzt Film ◽  
Sol Gel Process ◽  
Pzt Films ◽  
High Frequency Resonance ◽  
Piezoelectric Devices

AbstractLead zirconate titanate (PZT) films of up to 60 μm in thickness have been fabricated on a wide variety of substrates using a new sol gel process. The dielectric properties (∈ = 900), ferroelectric (Ec = 16 kV/cm and Pr = 35 μC/cm 2) and piezoelectric properties are comparable to bulk values. The characteristic Curie point of these films is at 420 °C. Piezoelectric actuators have been developed by depositing thick PZT films on both planar and coaxial substrates. Stainless steel cantilevers and optical fibres coated with a PZT film exhibit flexure mode resonant vibrations observable with the naked eye. A low frequency in-line fibre optic modulator has been developed using a PZT coated optical fibre. The high frequency resonance of a 60 μm film on a aluminum substrate has been observed.

Low-frequency and resonance magnetoelectric effects in lead zirconate titanate and single-crystal nickel zinc ferrite bilayers

2007 ◽  
Vol 22 (8) ◽  
pp. 2130-2135 ◽  
Author(s):  
V. Gheevarughese ◽  
U. Laletsin ◽  
V.M. Petrov ◽  
G. Srinivasan ◽  
N.A. Fedotov
Keyword(s):  
Single Crystal ◽  
Lead Zirconate Titanate ◽  
Low Frequency ◽  
Bias Field ◽  
Lead Zirconate ◽  
Field Orientation ◽  
Nickel Zinc ◽  
Voltage Coefficient ◽  
Zirconate Titanate ◽  
Zn Concentration

The nature of magnetoelectric (ME) interactions has been investigated in lead zirconate titanate (PZT) and (111) or (110) single-crystal nickel zinc ferrites. Data on the dependence of low-frequency ME voltage coefficients on static magnetic field orientation show (i) highest ME coefficients for bias field H along [100] and the smallest for H parallel to [110] and (ii) strongest ME interactions for transverse fields and for samples with Zn concentration of 0.3. Measurements on frequency dependence of ME coefficients reveal resonance enhancement due to bending and radial acoustic modes. The highest voltage coefficient is measured for radial modes in a sample with Zn concentration of 0.2. Theoretical estimates of low-frequency and resonance ME parameters are in very good agreement with data.

A nonlinear ultrasonic method for real-time bolt looseness monitoring using PZT transducer–enabled vibro-acoustic modulation

2019 ◽  
Vol 31 (3) ◽  
pp. 364-376 ◽  
Author(s):  
Nan Zhao ◽  
Linsheng Huo ◽  
Gangbing Song
Keyword(s):  
Real Time ◽  
Lead Zirconate Titanate ◽  
High Frequency ◽  
Ultrasonic Method ◽  
Low Frequency ◽  
Lead Zirconate ◽  
Modulation Method ◽  
Nonlinear Ultrasonic ◽  
Acoustic Modulation ◽  
Nonlinear Ultrasonic Method

A real-time nonlinear ultrasonic method based on vibro-acoustic modulation is applied to monitor early bolt looseness quantitatively by using piezoceramic transducers. In addition to the ability to detect the early bolt looseness, a major contribution is that we replaced the shaker, which is commonly used in a vibro-acoustic modulation method, by a permanently installed and low-cost lead zirconate titanate patch. In vibro-acoustic modulation, when stimulating two input waves with distinctive frequencies, namely the high-frequency probing wave and the low-frequency pumping wave, the high-frequency probing wave will be modulated by the low-frequency pumping wave to generate sidebands in terms of bolt looseness. Thus, the influence of low-frequency voltage amplitudes on the modulation results, which is ambiguous in previous research, is also analyzed in this article. The results of experiment demonstrated that the lead zirconate titanate–enabled vibro-acoustic modulation method is reliable and easy to implement to identify the bolt looseness continuously and quantitatively. In addition, low-frequency amplitudes of actuating voltage should be selected in a reasonable range. Finally, we compared the vibro-acoustic modulation method with the time-reversal method based on the linear ultrasonic theory, and the result illustrates that vibro-acoustic modulation method has better performance in monitoring the early bolt looseness.

Time-Dependent Nonlinear Ferroelastic Behaviour of Soft Lead Zirconate Titanate Piezoceramics

2006 ◽  
Vol 45 ◽  
pp. 2464-2471 ◽  
Author(s):  
Da Yu Zhou ◽  
Marc Kamlah ◽  
Yi Xiang Gan ◽  
Bernd Laskewitz
Keyword(s):  
Lead Zirconate Titanate ◽  
Domain Switching ◽  
Low Frequency ◽  
Lead Zirconate ◽  
Time Dependent ◽  
Nonlinear Behaviour ◽  
Rate Dependent ◽  
Zirconate Titanate ◽  
Time Dependent Effect ◽  
Made In

Motivated by predicting the performance and reliability of piezoelectric devices, considerable research efforts have been made in recent years to mathematically describe the largesignal nonlinear behaviour of ferroelectric piezoceramics. The success of such modelling approach depends strongly on our knowledge of the loading history dependence of the material properties. In this experimental work, the nonlinear ferroelastic behaviour was investigated in detail for a commercially available soft lead zirconate titanate (PZT) material under low-frequency compressive stress loading. It was found that the strain response was significantly loading rate dependent. The evolution of the elastic moduli was determined using fast small-stress partial unloading method, which was specially designed to minimize the time-dependent effect as much as possible. The results were used to separate the reversible elastic deformation from the irreversible plastic strain due to domain switching.

Rapid thermal processing of lead zirconate titanate thin films on Pt–GaAs substrates based on a novel 1,1,1-tris(hydroxymethyl)ethane sol-gel route

1999 ◽  
Vol 14 (2) ◽  
pp. 494-499 ◽  
Author(s):  
S. Arscott ◽  
R. E. Miles ◽  
J. D. Kennedy ◽  
S. J. Milne
Keyword(s):  
Thin Films ◽  
Lead Zirconate Titanate ◽  
Thermal Processing ◽  
Sol Gel ◽  
Rapid Thermal Processing ◽  
Low Frequency ◽  
Lead Zirconate ◽  
Si Substrates ◽  
Pzt Film ◽  
Gaas Substrates

0.53Ti0.47)O3 have been prepared on platinized GaAs (Pt–GaAs) substrates using a new 1,1,1-tris(hydroxymethyl)ethane (THOME) based sol-gel technique. Rapid thermal processing (RTP) techniques were used to decompose the sol-gel layer to PZT in an effort to avoid problems of GayAs outdiffusion into the PZT. A crystalline PZT film was produced by firing the sol-gel coatings at 600 or 650 ° for a dwell time of 1 s using RTP. A single deposition of the precursor sol resulted in a 0.4 μm thick PZT film. X-ray diffraction measurements revealed that the films possessed a high degree of (111) preferred orientation. Measured average values of remanent polarization (Pr ) and coercive field (Ec) for the film annealed at 650 ° for 1 s were 24 μC/cm2 and 32 kV/cm, respectively, together with a low frequency dielectric constant and loss tangent at 1 kHz of 950 and 0.02. These values are comparable to those obtainable on platinized silicon (Pt–Si) substrates using conventional sol-gel methods, and are an improvement on PZT thin films prepared on platinized GaAs using an earlier sol-gel route based on 1,3-propanediol.

Elastomechanical Study of Magnetoeletric Coupling in Bilayer of Lithium Zinc Ferrite and Lead Zirconate Titanate

2012 ◽  
Vol 602-604 ◽  
pp. 813-820
Author(s):  
Hong Xia Cao ◽  
Chuang Zhang ◽  
Qing Quan Liu ◽  
You Bao Wang
Keyword(s):  
Lead Zirconate Titanate ◽  
Zinc Ferrite ◽  
Volume Fraction ◽  
Low Frequency ◽  
Lead Zirconate ◽  
Linear Increase ◽  
Coupling Analysis ◽  
Material Parameters ◽  
Interface Coupling ◽  
Piezoelectric Phase

A theoretical model based on the constitutive equations of piezoelectrics and magnetostrictor is introduced to discuss the magnetoelectric (ME) coupling in freebody bilayer containing magnetostrictive and piezoelectric phases. The ME coupling at low frequency of Ni0.8Zn0.2Fe2O4–PZT bilayer have been studied by using the model and the corresponding material parameters of individual phases. The results show that the ME voltage coefficients can increase to a maximum at a given volume fraction of piezoelectric phase. An approximately linear increase of the maximum has been obtained with strengthening interface coupling. Analysis shows that large magnetostriction, appropriate volume fraction and ideal interface coupling are key ingredients for obtaining excellent ME performance.

scholarly journals Acoustically driven electromagnetic radiating elements

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Ahmed E. Hassanien ◽  
Michael Breen ◽  
Ming-Huang Li ◽  
Songbin Gong
Keyword(s):  
Lead Zirconate Titanate ◽  
Paradigm Shift ◽  
Communication Systems ◽  
Low Frequency ◽  
Lead Zirconate ◽  
Propagation Loss ◽  
Design Parameters ◽  
Future Improvement ◽  
Electrical State ◽  
Portable Communication

Abstract The low propagation loss of electromagnetic radiation below 1 MHz offers significant opportunities for low power, long range communication systems to meet growing demand for Internet of Things applications. However, the fundamental reduction in efficiency as antenna size decreases below a wavelength (30 m at 1 MHz) has made portable communication systems in the very low frequency (VLF: 3–30 kHz) and low frequency (30–300 kHz) ranges impractical for decades. A paradigm shift to piezoelectric antennas utilizing strain-driven currents at resonant wavelengths up to five orders of magnitude smaller than electrical antennas offers the promise for orders of magnitude efficiency improvement over the electrical state-of-the-art. This work demonstrates a lead zirconate titanate transmitter > 6000 times more efficient than a comparably sized electrical antenna and capable of bit rates up to 60 bit/s. Detailed analysis of design parameters offers a roadmap for significant future improvement in both radiation efficiency and data rate.

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