A5100685008- Ferroelectric and Piezoelectric Materials
- Acoustic Wave Resonator Technologies
- Piezoelectric Actuators and Control
- Microwave Dielectric Ceramics Synthesis
- Ultrasonics and Acoustic Wave Propagation
- Innovative Energy Harvesting Technologies
- Flow Measurement and Analysis
- Magnetic Bearings and Levitation Dynamics
- Advanced MEMS and NEMS Technologies
- Aeroelasticity and Vibration Control
- Soft Robotics and Applications
- Iterative Learning Control Systems
- Multiferroics and related materials
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Heart Rate Variability and Autonomic Control
- Advanced Sensor Technologies Research
- Acoustic Wave Phenomena Research
- ECG Monitoring and Analysis
- Mechanical Circulatory Support Devices
- Sensor Technology and Measurement Systems
- Engineering Applied Research
- Structural Health Monitoring Techniques
- Electrical and Bioimpedance Tomography
- High Entropy Alloys Studies
Shanghai Jiao Tong University
2013-2024
Southeast University
2024
State Grid Corporation of China (China)
2024
Pennsylvania State University
2013-2018
Harbin Institute of Technology
2014-2018
Xiamen University
2018
Zhejiang Normal University
2017
Harbin Engineering University
2017
Heilongjiang University of Chinese Medicine
2014
The complete set of material constants single domain rhombohedral phase 0.27Pb(In1/2Nb1/2)O3-0.46Pb(Mg1/3Nb2/3)O3-0.27PbTiO3:Mn crystal has been determined. orientation dependence piezoelectric, dielectric, and electromechanical properties was calculated based on these data. maximum piezoelectric were found to exist near the [001]C pseudo-cubic direction. In addition, poled crystals with “4R” multi-domain configuration experimentally measured compared values. Only a small difference (3%)...
High-precision time-of-flight (ToF) measurement is the key to flow rate of ultrasonic gas flowmeters. At present, accuracy cross-correlation method, which one ToF methods, depends on high-speed ADCs. However, these ADCs, have high cost, cannot be applied low-power embedded systems and meet practical requirement for actual industrial applications. To improve resolution difference ToF(dToF) under premise satisfying low-power, this paper proposes a novel signal processing method based...
A self-consistent complete set of dielectric, piezoelectric, and elastic constants for single domain Ta modified (K, Na)NbO3 (KNN) crystal was determined. This full constant KNN-based crystals allowed the prediction orientation dependence longitudinal coefficients, electromechanical coupling factors. The maximum piezoelectric properties were found to exist near [001]C. In addition, material [001]C poled engineered with 4 mm symmetry experimentally measured compared calculated values. Based...
The most difficult task in the characterization of complete set material properties for piezoelectric materials is self-consistency. Because there are many independent elastic, dielectric, and constants, several samples needed to obtain full constants. Property variation from sample often makes obtained data lack Here, we present a method, based on pulse-echo ultrasound inverse impedance spectroscopy, precisely determine physical using only one small sample, which eliminated problem...
Domain structures and their evolution with temperature in the [001]C oriented (K,Na)(Nb,Ta)O3 (KNNT) single crystal have been studied before after poling by polarizing light microscopy. The results indicate that KNNT is difficult to be completely poled room process. domain structure rather stable orthorhombic phase, but exhibits substantial changes near phase transition temperatures TO-T TC. Narrower stripe domains are formed during both orthorhombic-tetragonal tetragonal-cubic processes, no...
We report a face-shear mode ultrasonic motor (USM) made of [011]c poled Zt ± 45° cut 0.24Pb(In1/2Nb1/2)O3-0.46Pb(Mg1/3Nb2/3)O3-0.30PbTiO3 single crystal, which takes advantage the extremely large d36 = 2368 pC/N. This has maximum no-load linear velocity 182.5 mm/s and output force 1.03 N under drive Vp 50 V, f 72 kHz. Compared with k31 USM Pb(Zr,Ti)O3 (PZT), our simpler structure, lower driving frequency, much higher electromechanical coupling factor, twice power density. can be used for low...
The frequency dependence of the coercive field Ec in [001]c poled 0.71Pb(Mg1/3Nb2/3)O3-0.29PbTiO3 single crystals was investigated as a function f from 0.01 Hz to 5 MHz. found be proportional [Formula: see text] predicted by Ishibashi and Orihara model, but our results showed two regimes separated at around 1.0 MHz with different β values. This change switching kinetics may due presence slower relaxation times for non-180° domain heterogeneous nucleation polar nanoregions, whose contribution...
In this paper, we report the use of magnesium alloy (AZ31B) as matching material for PZT-5H ultrasonic transducers. The AZ31B has an acoustic impedance 10.3 MRayl, which provides a good match transducers in water medium based on double layer theory. Two with different center frequencies were designed and fabricated using AZ31B. respective two 4.6 MHz 9.25 MHz. transducer exhibits −6 dB bandwidth 79% two-way insertion loss −11.11 dB. also shows performance: 71% −14.43 properties are superior...
Nonlinearity and resonance frequency shift make it difficult to control the operation of traveling-wave ultrasonic motors (TWUSMs) in a wide velocity load range. In this paper, scheme based on stator vibration amplitude parallel (VCBVF) TWUSMs is proposed. Then, (SVA) ( f p ) are detected by transformer ratio-arm bridge. Based linear relationship between SVA TWUSMs, proposed achieves mechanical loop electrical loop. The makes achieve target efficiently, according SVA, could provide quickly....
Polarization switching and associated electromechanical property changes at 3.0 MHz were investigated with without a direct current (dc) bias for [001]c poled 0.70Pb(Mg1/3Nb2/3)O3-0.30PbTiO3 single crystal. The results showed that the coercive field under bipolar pulse is 2.75 times as large conventional defined Ec (2.58 kV/cm 0.1 Hz), dc can further enlarge driving field. Our point to an innovative transducer operating mechanism high frequencies since one could drive crystal much larger...
The dynamic ferroelectric hysteresis loops with internal bias field were investigated in poled and aged Mn-doped 0.24Pb(In<sub>1/2</sub>Nb<sub>1/2</sub>)O<sub>3</sub>–0.47Pb(Mg<sub>1/3</sub>Nb<sub>2/3</sub>)O<sub>3</sub>–0.29PbTiO<sub>3</sub> single crystal.