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Evaluation of flexural displacement in piezoelectric actuators considering the thermal deformation

Evaluation of flexural displacement in piezoelectric actuato...

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作者： Woo, Sung-Choong Goo, Nam Seo Artificial Muscle Research Center Konkuk University 1 Hwayang-dong Gwangjin-gu Seoul 143-701 Korea Republic of Intelligent Microsystem Program Department of Advanced Technology Fusion Konkuk University 1 Hwayang-dong Gwangjin-gu Seoul 143-701 Korea Republic of

In this article, the flexural displacement of plate-type piezoelectric composite actuators (PCA) with various lay-up configurations has been evaluated considering the thermal deformations induced by a temperature drop using a three-dimensional finite element simulation. The results reveal that the flexural displacement of PCA subjected to electrical loadings is significantly affected by their lay-up configurations, the thickness of constituent PZT ceramic and applied boundary conditions, which is associated with the location of the neutral plane by moment equilibrium and the bending stiffness of PCA. For the displacement performance of PCA, an adequate choice of layup configuration together with the proper thickness of PZT ceramic is required.

关键词： Piezoelectric actuators

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Bending characteristics of plate-type piezoelectric composite actuators according to applied electric fields and drive frequencies

Bending characteristics of plate-type piezoelectric composit...

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A performance evaluation of plate-type piezoelectric composite actuators (PCA) having different lay-up sequences was experimentally carried out at simply supported and fixed-free boundary conditions. The actuating displacement of the manufactured PCAs was measured using a non-contact laser displacement measurement system. It was shown that the actuating displacement with increasing applied electric field at a drive frequency of 1 Hz increased nonlinearly at the simply supported boundary condition whereas it almost linearly increased at the fixed-free boundary condition. In contrast, the actuating displacement of the PCAs depended on the applied electric fields in a drive frequency range from 1 Hz to 10 Hz. However, the displacement behavior of PCAs varied significantly at a higher range of drive frequency, i.e., beyond 15 Hz, due to the occurrence of resonance. On the basis of these experimental results, the bending characteristics of PCAs in relation to applied electric field, drive frequency, and boundary conditions were elucidated.

关键词： Actuators

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Durability of a conducting shape memory polyurethane actuator

Durability of a conducting shape memory polyurethane actuato...

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17th International Conference on Adaptive Structures and Technologies, ICAST 2006

作者： Goo, N.S. Paik, I.L. Jung, Y.C. Cho, J.W. Intelligent Microsystem Program Department of Advanced Technology Fusion Konkuk University Seoul 143-701 Korea Republic of Department of Aerospace Engineering Konkuk University Seoul 143-701 Korea Republic of Department of Textile Engineering Konkuk University Seoul 143-701 Korea Republic of

ISBN: (纸本)9781605601250

This paper discusses the actuation durability of a conducting shape memory polyurethane (CSMPU) actuator. Introduced in 2004, the CSMPU actuator was manufactured by an in situ polymerization method for shape memory polyurethane with multiwalled carbon nanotubes. In order to apply the CSMPU to smart actuators and determine detailed design concepts, the durability data should be measured. Hence, the experiments in this research were designed to obtain durability data, and the maximum number of actuation cycles versus the initial elongation ratio and the actuation temperature were measured for the purpose of assessing durability. The broken surfaces of the specimens were investigated.

关键词： Durability

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Characterization of the fracture process of a plate-type piezoelectric composite actuator under a bending load by acoustic emission monitoring

Characterization of the fracture process of a plate-type pie...

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Characteristics during the fracture process of a plate-type piezoelectric composite actuator (PCA) using acoustic emission (AE) monitoring were investigated under a bending load. The fracturing of a monolithic PZT ceramic shows typically brittle behavior;furthermore, the AE signal at the maximum load, which corresponds to the final fracture, has a high amplitude and long duration. Analysis of dominant frequency bands by a fast Fourier transform (FFT) in conjunction with AE parametric analysis expressed the characteristic changes of the fracture process in the PCA. For the PCA, a brittle fracture in a PZT ceramic layer induces the local delamination between the PZT ceramic and adjacent fiber composite layers. Based on the AE analysis and damage observations through optical microscopy, the features of AE associated with fracture process can be elucidated for the PCA.

关键词： Actuators

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A novel PDMS valveless micropump with a circular lightweight piezo-composite actuator

A novel PDMS valveless micropump with a circular lightweight...

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作者： Nguyen, Thanh-Tung Goo, Nam Seo Artificial Muscle Research Center Department of Aerospace Engineering Konkuk University 1 Hwayang-dong Kwangjjn-gu 143-701 Seoul Korea Republic of Intelligent Microsystem Program Department of Advanced Technology Fusion Konkuk University 1 Hwayang-dong Kwangjjn-gu 143-701 Seoul Korea Republic of

This paper presents a design and performance evaluation of a valveless micropump fabricated from polydimethylsiloxane (PDMS) based on molding techniques. A circular lightweight piezo-composite actuator (LIPCA) was successfully developed for the actuating diaphragm of the micropump. The LIPCA is a composite actuator designed and fabricated with piezoceramics in combination with carbon fabric and glass epoxy. Numerical and experimental methods were used to investigate the performance of the circular LIPCA. The LIPCA was glued to a PDMS membrane to form the diaphragm of the micropump. The diaphragm has several advantages, such as high displacement, dome-shaped deformation and geometrically independent actuation profile. The diaphragm based on a LIPCA 9 mm in diameter produces a deflection of 27 μm at the applied voltage of ± 200 V and a frequency of 1 Hz. The micropump has a maximum water flow rate of 0.95 ml/min and a maximum backpressure of 3.8 kPa. The merits of the present micropump are low cost, ease of manufacturing and high level of effectiveness. The proposed LIPCA is proven to be a promising alternative to the conventional piezoelectric actuator used in micropumps.

关键词： Piezoelectric devices

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A novel polymeric micropump based on a multilayered ionic polymer-metal composite

A novel polymeric micropump based on a multilayered ionic po...

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IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

作者： Nguyen, Thanh Tung Nguyen, Vinh Khanh Yoo, Youngtai Goo, Nam Seo Artificial Muscle Research Center Konkuk University 1 Hwayang-dong Gwangjin-gu Seoul 143-701 Korea Republic of Department of Aerospace Engineering Konkuk University 1 Hwayang-dong Gwangjin-gu Seoul 143-701 Korea Republic of Department of Materials Chemistry and Engineering Konkuk University 1 Hwayang-dong Gwangjin-gu Seoul 143-701 Korea Republic of Intelligent Microsystem Program Department of Advanced Technology Fusion Konkuk University 1 Hwayang-dong Gwangjin-gu Seoul 143-701 Korea Republic of

ISBN: (纸本)1424401364

In this paper, a novel flap valve micropump with an ionic polymer-metal composite (IPMC) actuator was designed, fabricated, and experimentally characterized. A high performance multilayered IPMC based on Nafion/layered silicate and Nafion/silica nanocomposites was fabricated for the actuation section of a micropump. A key element of the micropump is the IPMC driven diaphragm. The IPMC diaphragm was designed so that the IPMC actuator was supported by a flexible polydimethylsiloxane (PDMS) structure at its perimeter. This design feature enabled a significantly high displacement of the IPMC diaphragm. The IPMC diaphragm reached a high fractional stroke (i.e. displacement per unit length) as high as 1.6%. The overall size of the micropump is 20204 mm3. Water flow rates of up to 760 μl/min and a maximum backpressure of 1.5 kPa were recorded. A significant advantage of the proposed micropump is its low driven voltage from only 1-3 V. In addition, a simple and effective design, and an ease of manufacturing are other advantages of this micropump. © 2006 IEEE.

关键词： Polydimethylsiloxane

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A Novel Polymeric Micropump based on a Multilayered Ionic Polymer-Metal Composite

A Novel Polymeric Micropump based on a Multilayered Ionic Po...

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Annual Conference of Industrial Electronics Society

作者： Thanh Tung Nguyen Vinh Khanh Nguyen Youngtai Yoo Nam Seo Goo Department of Aerospace Engineering Konkuk University Seoul South Korea Artificial Muscle Research Center Konkuk University Seoul South Korea Artificial Muscle Research Center Konkuk University 1 Hwayang-dong Gwangjin-gu Seoul 143-701 KOREA Department of Materials Chemistry and Engineering Konkuk University 1 Hwayang-dong Gwangjin-gu Seoul 143-701 KOREA Intelligent Microsystem Program Department of Advanced Technology Fusion Konkuk University 1 Hwayang-dong Gwangjin-gu Seoul 143-701 KOREA. Email: nsgoo@konkuk.ac.kr

In this paper, a novel flap valve micropump with an ionic polymer-metal composite (IPMC) actuator was designed, fabricated, and experimentally characterized. A high performance multilayered IPMC based on Nafion/layered silicate and Nafion/silica nanocomposites was fabricated for the actuation section of a micropump. A key element of the micropump is the IPMC driven diaphragm. The IPMC diaphragm was designed so that the IPMC actuator was supported by a flexible polydimethylsiloxane (PDMS) structure at its perimeter. This design feature enabled a significantly high displacement of the IPMC diaphragm. The IPMC diaphragm reached a high fractional stroke (i.e. displacement per unit length) as high as 1.6%. The overall size of the micropump is 20times20times4 mm 3 . Water flow rates of up to 760 mul/min and a maximum backpressure of 1.5 kPa were recorded. A significant advantage of the proposed micropump is its low driven voltage from only 1-3 V. In addition, a simple and effective design, and an ease of manufacturing are other advantages of this micropump

关键词： Polymers Micropumps Valves Delay intelligent actuators Low voltage Electromagnetic forces Muscles Aerospace materials Composite materials

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