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Microstructure and electrical properties of NaNbO

Shihui XIE, Kongjun ZHU, Jinhao QIU, Hua GUO

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 3, Pages 345-349 doi: 10.1007/s11465-009-0050-9

Abstract: Lead-free piezoelectric ceramics (1- )NaNbO - BaTiO have been fabricated by a traditional ceramic sinteringeffects of BaTiO (BT) synthesized by hydrothermal method on crystal structure, density, dielectric, piezoelectricHowever, the optimum composition for (1- )NaNbO - BaTiO ceramics is 0.90NaNbO -0.10BaTiO .The 0.90NaNbO -0.10BaTiO ceramics sintered at 1250°C have higher properties: piezoelectric constantThe results show that the (1- )NaNbO - BaTiO ceramics is one of the promising lead-free materials for

Keywords： Lead-free piezoelectric ceramics NaNbO₃-BaTiO₃ piezoelectricity ceramics crystal

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Ultrasonic Motor Techniques for 21st Century

Zhao Chunsheng

Strategic Study of CAE 2002, Volume 4, Issue 2, Pages 86-91

Abstract:

Firstly, a review of the development and applications of the ultrasonic motor techniques since the seventies of the last century, both at home and abroad is outlined, and a presentation of progress in the research on the techniques in the Research Center of Ultrasonic Motors of NUAA is summarized. Secondly, the author predicts that a great and growing market for the motors will be found in the 21st century, and the techniques will have a good future of applications in the building of national defense and economy. Finally, the trend of the development of the motor in the 21st century is pointed out. According to the actual condition of the studies for the techniques in China, some key problems, which are urgent for further development of the technologies in the new century, are proposed in the paper.

Keywords： ultrasonic motor piezoelectric ceramics friction materials

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Depth of cut models for multipass abrasive waterjet cutting of alumina ceramics with nozzle oscillation

Jun WANG

Frontiers of Mechanical Engineering 2010, Volume 5, Issue 1, Pages 19-32 doi: 10.1007/s11465-009-0082-1

Abstract: An experimental study of the depth of cut in multipass abrasive waterjet (AWJ) cutting of alumina ceramicscutting using a dimensional analysis technique and the particle erosion theories applied to alumina ceramics

Keywords： abrasive waterjet engineering ceramics depth of cut cutting performance nozzle oscillation machining

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Separation mechanism for double cylinder with shrink fitting system used for ceramics conveying rollers

Wenbin LI, Hiromasa SAKAI, Shota HARADA, Yasushi TAKASE, Nao-Aki NODA

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 3, Pages 277-286 doi: 10.1007/s11465-011-0234-y

Abstract: In previous studies, new roller structure was considered which has a ceramics sleeve connected with twoHere, although the ceramics sleeve can be used for many years, the steel shafts sometimes have to beSince the thermal expansion coefficient of steel is about five times larger than that of ceramics, it

Keywords： contact ceramics thermal stress heating finite element method

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Research on applications of piezoelectric materials in smart structures

Jinhao QIU, Hongli JI

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 1, Pages 99-117 doi: 10.1007/s11465-011-0212-4

Abstract:

Piezoelectric materials have become the most attractive functional materials for sensors and actuatorsIn this article, some research activities on the applications of piezoelectric materials in smart structuresenergy harvesting using new electronic interfaces, structural health monitoring based on a new type of piezoelectric

Keywords： piezoelectric materials vibration control energy harvesting structural health monitoring piezoelectric

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Present situation and classification of piezoelectric pump

Fang YE, Shouyin WANG, Wei CHENG, Qixiao XIA, Jianhui ZHANG,

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 4, Pages 420-429 doi: 10.1007/s11465-009-0052-7

Abstract: According to the present classification method for a piezoelectric pump, this paper reviews the developmentA volumetric piezoelectric pump, which belongs to traditional volumetric pumps, can be divided into apiezoelectric pump with or without valves.A new valveless piezoelectric pump nowadays becomes a hot issue in scientific research.New forms of piezoelectric pumps, different from traditional ones, are only at the stage of conception

Keywords： piezoelectric pump development and present situation new classification method valveless piezoelectricpump new forms of piezoelectric pump

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Robust isogeometric topology optimization for piezoelectric actuators with uniform manufacturability

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 2, doi: 10.1007/s11465-022-0683-5

Abstract: Piezoelectric actuators have received substantial attention among the industry and academia due to quickHowever, the design of piezoelectric actuators always suffers from the emergence of several localizedcurrent paper is to propose a robust isogeometric topology optimization (RITO) method for the design of piezoelectricthe conventional finite element method is applied to compute the unknown electro elastic fields in piezoelectricFinally, the RITO formulation for the design of piezoelectric materials is developed, and several numerical

Keywords： piezoelectric actuator isogeometric topology optimization uniform manufacturability robust formulation

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Novel precision piezoelectric step rotary actuator

LIU Jianfang, YANG Zhigang, ZHAO Hongwei, CHENG Guangming

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 3, Pages 356-360 doi: 10.1007/s11465-007-0062-2

Abstract: A novel piezoelectric (PZT) precision step rotary actuator was developed on the basis of PZT technology

Keywords： developed stability ineffective anchoring/loosening technology piezoelectric

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A valveless piezoelectric pump with novel flow path design of function of rectification to improve energy

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 3, doi: 10.1007/s11465-022-0685-3

Abstract: Existing valveless piezoelectric pumps are mostly based on the flow resistance mechanism to generatefield simulation, the proposed tubes were integrated into a piezo-driven chamber, and a novel valveless piezoelectricThe development of NVPPFR compensated for the inefficiency of traditional valveless piezoelectric pumps

Keywords： composite tube valveless piezoelectric pump rectification energy efficiency

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Boundary conditions for axisymmetric piezoelectric cylinder

Baosheng ZHAO, Di WU, Xi CHEN

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 4, Pages 401-408 doi: 10.1007/s11465-013-0272-8

Abstract:

For axisymmetric piezoelectric cylinder, the reciprocal theorem and the axisymmetric general solutiondeveloped by Gregory and Wan is converted into necessary conditions on the end-data of axisymmetric piezoelectricon the end of cylinder, these decaying state conditions for the case of axisymmetric deformation of piezoelectricformulation of boundary conditions for the theory solution (or the interior solution) of axisymmetric piezoelectric

Keywords： solid and structures the axisymmetric deformation the piezoelectric circular cylinder the refined theory

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Comparison between four piezoelectric energy harvesting circuits

Jinhao Qiu, Hao Jiang, Hongli Ji, Kongjun ZHU

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 2, Pages 153-159 doi: 10.1007/s11465-009-0031-z

Abstract: This paper investigates and compares the efficiencies of four different interfaces for vibration-based energy harvesting systems. Among those four circuits, two circuits adopt the synchronous switching technique, in which the circuit is switched synchronously with the vibration. In this study, a simple source-less trigger circuit used to control the synchronized switch is proposed and two interface circuits of energy harvesting systems are designed based on the trigger circuit. To validate the effectiveness of the proposed circuits, an experimental system was established and the power harvested by those circuits from a vibration beam was measured. Experimental results show that the two new circuits can increase the harvested power by factors 2.6 and 7, respectively, without consuming extra power in the circuits.

Keywords： energy harvesting piezoelectric materials synchronized switching

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Performance analysis of piezoelectric bimorph generator

KAN Junwu, TANG Kehong, ZHAO Hongwei, SHAO Chenghui, ZHU Guoren

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 2, Pages 151-157 doi: 10.1007/s11465-008-0039-9

Abstract: In this paper, the theoretical model and simulation of the performance of a piezoelectric (PZT) bimorphThe generator consists of two piezoelectric plates bonded on a substrate metal plate.The results show that there is a optimal thickness ratio for a piezoelectric bimorph generator to achieve

Keywords： piezoelectric bimorph substrate addition PZT mechanical

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Spectral element modeling based structure piezoelectric impedance computation and damage identification

Zhigang GUO, Zhi SUN

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 4, Pages 458-464 doi: 10.1007/s11709-011-0133-7

Abstract: This paper presents a numerical simulation study on electromechanical impedance technique for structural damage identification. The basic principle of impedance based damage detection is structural impedance will vary with the occurrence and development of structural damage, which can be measured from electromechanical admittance curves acquired from PZT patches. Therefore, structure damage can be identified from the electromechanical admittance measurements. In this study, a model based method that can identify both location and severity of structural damage through the minimization of the deviations between structural impedance curves and numerically computed response is developed. The numerical model is set up using the spectral element method, which is promised to be of high numerical efficiency and computational accuracy in the high frequency range. An optimization procedure is then formulated to estimate the property change of structural elements from the electric admittance measurement of PZT patches. A case study on a pin-pin bar is conducted to investigate the feasibility of the proposed method. The results show that the presented method can accurately identify bar damage location and severity even when the measurements are polluted by 5% noise.

Keywords： PZT piezoelectric impedance optimization spectral element damage identification

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Low crosstalk switch unit for dense piezoelectric sensor networks

Lei QIU, Shenfang YUAN,

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 4, Pages 401-406 doi: 10.1007/s11465-009-0047-4

Abstract: Structural health monitoring (SHM), on the basis of piezoelectric (PZT) sensors and lamb wave method,Furthermore, to monitor large-scale structures, dense piezoelectric sensor networks are required, whichusually contain many piezoelectric sensor pairs called actuator-sensor channels.

Keywords： structural health monitoring (SHM) piezoelectric (PZT) sensor networks switch unit crosstalk signal

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Vibration control efficiency of piezoelectric shunt damping system

Dan WU, Zhichun YANG, Hao SUN,

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 4, Pages 441-446 doi: 10.1007/s11465-009-0055-4

Abstract: The piezoelectric shunt damping technique based on the direct piezoelectric effect has been known asIn this technique, a piezoelectric material is used to transform mechanical energy to electrical energyWhen applying the piezoelectric shunt damping technique to passively control structural vibration, thepiezoelectric materials must be bonded on or embedded in host structure where large strain is inducedIn this paper, the concept of vibration control efficiency of a piezoelectric shunt damping system is

Keywords： piezoelectric shunt vibration control efficiency clamped plate generalized electromechanical coupling