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  • 1
    Electronic Resource
    Electronic Resource
    Performance Evaluation of a Valveless Micropump Considering Electro-Structural-FluidInteraction (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 749-752 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper, the pumping performance of a piezoelectric micropump is simulated withcommercial finite element analysis (FEA) software COMSOL Multiphysics 3.2a. The micropump iscomposed of a 4-layer piezo-composite actuator (LIPCA), a polydimethylsiloxane (PDMS) pumpchamber, and two diffusers. The piezoelectric domain, structural domain and fluid domain arecoupled in the simulation. Water flow rates are numerically predicted for geometric parameters ofthe micropump. Based on this study, the micropump is optimally designed to obtain its betterpumping performance
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.749.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Evaluation of Flexural Displacement in Piezoelectric Actuators Considering the ThermalDeformation (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 1141-1144 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this article, the flexural displacement of plate-type piezoelectric composite actuators(PCA) with various lay-up configurations has been evaluated considering the thermal deformationsinduced by a temperature drop using a three-dimensional finite element simulation. The resultsreveal that the flexural displacement of PCA subjected to electrical loadings is significantly affectedby their lay-up configurations, the thickness of constituent PZT ceramic and applied boundaryconditions, which is associated with the location of the neutral plane by moment equilibrium andthe bending stiffness of PCA. For the displacement performance of PCA, an adequate choice of layupconfiguration together with the proper thickness of PZT ceramic is required
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.1141.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Development of a High Performance Peristaltic Micropump (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 726-729 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this study, a high performance peristaltic micropump has been developed andinvestigated. The micropump has three cylinder chambers which are connected through microchannelsand two normally closing active membrane valves at inlet/outlet for high pumpingpressure performance. A circular shaped miniature LIPCA has been developed and manufacturedfor actuating diaphragms. In this LIPCA, a 0.1mm thickness PZT ceramic is used as an active layer.As a result, the actuator has shown to produce large out-of-plane deflection and consumed lowpower. During the design process, a coupled field analysis was conducted to predict the actuatingbehavior of a diaphragm. The actuator behavior was investigated both theoretically andexperimentally. In addition, MEMS technique was used to fabricate the peristaltic micropump.Judging from experimental flow rate and pumping pressure results, the present peristalticmicropump has higher performance than the same kind of micropump developed elsewhere
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.726.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Analysis of Impact Response and Damage of Composite Panels by Finite Element Method (1997)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 141-143 (Sept. 1997), p. 695-712 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/44/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.141-143.695.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of Low-Velocity Impact on Composite Sandwich Panels Using an Assumed Strain Solid Element (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 261-263 (Apr. 2004), p. 283-288 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Low-velocity impact on composite sandwich panels has been investigated. The contact force is computed from a proposed modified Hertzian contact law. In the proposed contact law, the exponent is adjusted and the through-the-thickness elastic constant of honeycomb core is reduced properly to approximately predict the measured contact force-time history during the impact. The equivalent transverse elastic constant is calculated from the rule of mixture. Nonlinear equation to calculate the contact force is solved by the Newton-Raphson method and time integration is done by the Newmark-beta method. A finite element program for the low-velocity impact analysis is coded by implementing these techniques and an 18-node assumed strain solid element. Behaviors of composite sandwich panels subjected to low-velocity impact are analyzed for various cases with different geometry and lay-ups. It has been found that the present code with the proposed contact law can predict measured contact forces and contact times for most cases within reasonable error bounds, especially for thick sandwich plates
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/47/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.261-263.283.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Actuator Performance Degradation of Piezo-Composite Actuator LIPCA under Cyclic Actuation (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 261-263 (Apr. 2004), p. 1331-1336 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper is concerned with the fatigue characteristics of LIPCA (LIghtweight Piezo-Composite Actuator) device system. LIPCA device system is composed of a piezoelectric ceramic layer and fiber reinforced light composite layers, typically a PZT ceramic layer is sandwiched by a top fiber layer with low CTE (coefficient of thermal expansion) and base layers with high CTE. The advantages of the LIPCA design are using the lightweight fiber reinforced plastic layers without compromising the generation of high force and large displacement and to have design flexibility by selecting the fiber direction and the size of prepreg layers. In addition to the lightweight advantage and design flexibility, the proposed device can be manufactured without adhesive layers when we use resin prepreg system. To investigate the degradation of actuation performance of LIPCA due to the repeated fatigue loading, the repeated loading tests up to several million cycle were performed and the actuation displacement for a given excitation voltage was measured during the test. The fatigue characteristics was measured using an actuator test system consisted of an actuator supporting jig, a high voltage actuating power supplier, and a non-contact laser measuring system and evaluated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/47/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.261-263.1331.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Parametric Study on Compression Deformation Behavior of Conformal Load-Bearing Smart Skin Antenna Structure (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 261-263 (Apr. 2004), p. 663-668 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper, a simple conformal load-bearing antenna structure smart skin with a multi-layer sandwich structure composed of carbon/epoxy, glass/epoxy, and a dielectric polymer was designed and fabricated. The mechanical properties of each material in the designed smart skin were obtained from experiments. Tests and analyses were conducted to study the behavior of the smart skin under compressive loads. The designed smart skin failed due to buckling before compression failure. The stresses of each layer and the first failed layer of the smart skin were predicted using MSC/NASTRAN. The finite element model was verified by comparing the numerical results from geometrical linear/nonlinear analyses with the measured data. The numerically predicted structural behavior of the smart skin agreed well with the experimental data. The results showed that the carbon/epoxylayer took charge of most of the compressive load, and the first failure occurred in the dielectric layer while the other layers remained safe.A numerical model was used to obtain design data from the parametric study. The effect of changing the design variables on the buckling and compressive behavior of the smart skin was also investigated. As a result, it was confirmed that the transverse shear moduli of the honeycomb core had a serious impact on the buckling load of the smart skin when the shear deformation was considerable
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/47/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.261-263.663.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Behavior of Lightweight Piezoceramic Composite Actuator under Compressive Load (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 1403-1406 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this work, behavior of a unimorph piezoceramic actuator, LIPCA (Lightweight Piezo-Composite Actuator) has been numerically and experimentally investigated. By measuring thelateral displacement created by the compressive load, the buckling load of the LIPCA wasdetermined. Under simply supported configuration, the measured buckling load agreed well withthe geometrically nonlinear buckling load from the finite element analysis. The measured datashows that the lateral displacement of the LIPCA is significantly increased when the electric field isprescribed to the LIPCA in addition to the compressive load. The measured data was comparedwith the computed results from the geometrically nonlinear finite element analysis. The numericalsimulation agreed well with the measurement for low compressive load and low electric field
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.1403.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Bending Characteristics of Plate-Type Piezoelectric Composite Actuators According to Applied Electric Fields and Drive Frequencies (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 1701-1704 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A performance evaluation of plate-type piezoelectric composite actuators (PCA) havingdifferent lay-up sequences was experimentally carried out at simply supported and fixed-freeboundary conditions. The actuating displacement of the manufactured PCAs was measured using anon-contact laser displacement measurement system. It was shown that the actuating displacementwith increasing applied electric field at a drive frequency of 1 Hz increased nonlinearly at thesimply supported boundary condition whereas it almost linearly increased at the fixed-freeboundary condition. In contrast, the actuating displacement of the PCAs depended on the appliedelectric fields in a drive frequency range from 1 Hz to 10 Hz. However, the displacement behaviorof PCAs varied significantly at a higher range of drive frequency, i.e., beyond 15 Hz, due to theoccurrence of resonance. On the basis of these experimental results, the bending characteristics ofPCAs in relation to applied electric field, drive frequency, and boundary conditions were elucidated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.1701.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Power Consumption of Piezo-Composite Actuator at Resonance Frequency (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 306-308 (Mar. 2006), p. 1181-1186 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper addresses the power consumption of the LIPCA (LIghtweight Piezo-Composite Actuator) device system when electric input was applied at its resonance frequency. The LIPCA device system is composed of a piezoelectric ceramic layer and fiber reinforced lightweight composite layers. Typically, a PZT ceramic layer is sandwiched by a top fiber layer with low CTE (coefficient of thermal expansion) and base layers with high CTE. The advantages of the LIPCAdesign are weight reduction by using the lightweight fiber reinforced plastic layers without compromising the generation of high force and large displacement, and design flexibility by selecting the fiber direction and the size of prepreg layers. An experimental set-up was specially designed to measure the power consumption of the LIPCA. By measuring the capacitance of the PZT ceramic wafer during the test, the electric power that consumed can be determined. Experimental results revealed a significant increase in capacitance of the PZT ceramic wafer with an increase in the frequency of applied voltage around the natural frequency of the actuator
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.306-308.1181.pdf
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