FEM and Micromechatronics with ATILA Software

Uchino, K.

doi:10.1201/b15882

Cited by 28 publications

(29 citation statements)

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“…All are related to the conversion rate between the electrical energya nd mechanical energy,b ut their definitions are different. [19,20] (a) The electromechanical coupling factor k…”

Section: Piezoelectric Strain Constant Dmentioning

confidence: 99%

Piezoelectric Energy Harvesting Systems—Essentials to Successful Developments

Uchino

2018

Energy Tech

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In recent years, industrial and academic research units have focused on harvesting energy from mechanical vibrations using piezoelectric transducers. These efforts have provided research guidelines and have brought to light the problems and limitations of piezoelectric systems. There are three major phases associated with piezoelectric energy harvesting: (i) mechanical–mechanical energy transfer, including mechanical stability of the piezoelectric transducer under large stresses, and mechanical impedance matching, (ii) mechanical–electrical energy transduction, relating to the electromechanical coupling factor in the composite transducer structure, and (iii) electrical–electrical energy transfer, including electrical impedance matching, such as a direct current (DC/DC) conversion to transfer the energy to a rechargeable battery. This Review starts from the historical background of piezoelectric energy harvesting, followed by several misconceptions by current researchers. The main part deals with step‐by‐step detailed energy flow analysis energy harvesting systems with lead zirconate titanate (PZT)‐based devices to provide comprehensive strategies on how to improve the efficiency of the harvesting system.

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“…All are related to the conversion rate between the electrical energya nd mechanical energy,b ut their definitions are different. [19,20] (a) The electromechanical coupling factor k…”

Section: Piezoelectric Strain Constant Dmentioning

confidence: 99%

Piezoelectric Energy Harvesting Systems—Essentials to Successful Developments

Uchino

2018

Energy Tech

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“…Particular attention has been given to piezoelectric/electrostrictive ceramic actuators, shape memory devices of alloys such as Ni-Ti and Cu-Zn-Al, and magnetostrictive actuators using Terfenol D (Tb-Fe-Dy) alloys. Rigid strains induced in a piezoelectric ceramic by an external electric field have been used as ultraprecision cutting machines, in the Hubble telescope on the space shuttle and in dot-matrix printer heads [1][2][3][4][5]. There has also been proposed a parabolic antenna made of shape memory alloy, which is in a compactly folded shape when first launched on an artificial satellite, and subsequently recovers its original shape in space when exposed to the heat of the sun.…”

Section: Development Trend Of Solid State Actuatorsmentioning

confidence: 99%

Antiferroelectric Shape Memory Ceramics

Uchino

2016

Actuators

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Antiferroelectrics (AFE) can exhibit a "shape memory function controllable by electric field", with huge isotropic volumetric expansion (0.26%) associated with the AFE to Ferroelectric (FE) phase transformation. Small inverse electric field application can realize the original AFE phase. The response speed is quick (2.5 ms). In the Pb 0.99 Nb 0.02 [(Zr 0.6 Sn 0.4 ) 1-y Ti y ] 0.98 O 3 (PNZST) system, the shape memory function is observed in the intermediate range between high temperature AFE and low temperature FE, or low Ti-concentration AFE and high Ti-concentration FE in the composition. In the AFE multilayer actuators (MLAs), the crack is initiated in the center of a pair of internal electrodes under cyclic electric field, rather than the edge area of the internal electrodes in normal piezoelectric MLAs. The two-sublattice polarization coupling model is proposed to explain: (1) isotropic volume expansion during the AFE-FE transformation; and (2) piezoelectric anisotropy. We introduce latching relays and mechanical clampers as possible unique applications of shape memory ceramics.Keywords: antiferroelectrics; PNZST; shape memory ceramics; phase transformation; two-sublattice polarization coupling model; electrostriction Development Trend of Solid State ActuatorsDevelopment of solid state actuators aimed at replacing conventional electromagnetic motors has been remarkable in the following three areas: precision positioning, vibration suppression and miniature motors. Particular attention has been given to piezoelectric/electrostrictive ceramic actuators, shape memory devices of alloys such as Ni-Ti and Cu-Zn-Al, and magnetostrictive actuators using Terfenol D (Tb-Fe-Dy) alloys. Rigid strains induced in a piezoelectric ceramic by an external electric field have been used as ultraprecision cutting machines, in the Hubble telescope on the space shuttle and in dot-matrix printer heads [1][2][3][4][5]. There has also been proposed a parabolic antenna made of shape memory alloy, which is in a compactly folded shape when first launched on an artificial satellite, and subsequently recovers its original shape in space when exposed to the heat of the sun. Smart skins on submarines or military tanks were targets for solid state actuators [6].In general, thermally-driven actuators such as shape memory alloys can show very large strains, but require large drive energy and exhibit slow response. Magnetic field-driven magnetostrictive devices have serious problems with size because of the necessity for the magnetic coil and shield. The subsequent Joule heat causes thermal dilatation in the system, and leakage magnetic field sometimes interferes with the operating hybrid electronic circuitry. On the contrary, electric field-driven piezoelectric and electrostrictive actuators have been most developed because of their high efficiency, quick response, compact size, no generation of heat or magnetic field, in spite of relatively small induced strains. This article reviews shape memory properties of ceramics, focusing o...

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“…We further calculate cos (p Ã 1 l 1 ), cos (p 2 l 2 ), tan (p 1 l 1 ), and tan (p Ã 1 l 1 ) with an expansion-series approximation around p 1 l 1 = l 1 p=l 1 + l 2 and p 2 l 2 = l 2 p=l 1 + l 2 (Uchino and Giniewicz, 2003). A new frequency parameter is introduced, DO l (( 1), which is defined by equation (20).…”

Section: Longitudinal Vibration Mode Analysismentioning

confidence: 99%

“…Slender piezoelectric ceramics stacked with passive layers are the most commonly practiced piezo-actuator structure in actuator, ultrasonic motor, energy harvesting, vibration damping, and sensor applications (Bendary et al, 2010;Bonello and Rafique, 2011;Ferreira et al, 2004;Gaudenzi, 2009;Li, 2011;Maleki et al, 2011;Roy and Yu, 2009;Uchino and Giniewicz, 2003;Watson et al, 2009). Their simple, low-cost, and slender design, which is reinforced by passive elements, is the main reason of their popularity.…”

Section: Introductionmentioning

confidence: 99%

Analysis of longitudinal and torsional resonance vibrations of a piezoelectrically excited bar by introducing piezoelectric loss coefficients

Bai

Tuncdemir

Guo

et al. 2012

Journal of Intelligent Material Systems and Structures

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In this study, a method to develop a resonance vibration model of a piezo-bar with slanted ceramics is presented by considering piezoelectric loss coefficients. The vibration model reported here predicts natural frequencies and mode shapes for longitudinal and torsional modes. Analytical results for the longitudinal and torsional vibration displacements were formulated as a function of material and geometric properties. Parametrical analysis of the resonance vibration modes and the explicit solution of the vibration displacement provide a tool for improving the design and developing control schemes for devices such as ultrasonic motors that utilize this structure. Model calculations were compared with ATILAä finite element analysis simulations and good agreements were found. The model and the formulas to find the resonance frequencies and to calculate the vibration displacement were verified for different design parameters. Although the model was developed for a slanted ceramic stator of a multimode ultrasonic motor, the method to develop the model can be utilized for other single-degree-of-freedom piezoelectric ceramic applications.

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FEM and Micromechatronics with ATILA Software

Cited by 28 publications

References 0 publications

Piezoelectric Energy Harvesting Systems—Essentials to Successful Developments

Piezoelectric Energy Harvesting Systems—Essentials to Successful Developments

Antiferroelectric Shape Memory Ceramics

Analysis of longitudinal and torsional resonance vibrations of a piezoelectrically excited bar by introducing piezoelectric loss coefficients

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