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  • 2005-2009  (30)
  • 1995-1999  (2)
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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
    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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  • 6
    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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  • 7
    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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  • 8
    Electronic Resource
    Electronic Resource
    Structural Design, Manufacturing, and Wind Tunnel Test of a Small Expandable Wing (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 306-308 (Mar. 2006), p. 1157-1162 
    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 describes design, manufacturing, and wind tunnel test of a motor-drivensmall-scale expandable wing for MAV class vehicles. The bird-like expandable wing has been developed for investigating the influence of aspect ratio change on the lift and drag of the wing. As a typical bird wing, the wing is separated into inner and outer wings. The wing model consists of the linkage system made of carbon composite strip/rod and the remaining part covered with carbon composite sheet and multiple LIPCAs (Lightweight Piezo-Composite Actuators) mimicking wingfeathers. The LIPCA actuator was used to control wing camber, which created additional lift. Wind tunnel tests were conducted to investigate the changes in lift and drag during wing folding and expansion, and to observe the influence of LIPCA actuation on the wing. In the tests, effects of the wing fold/expansion and actuation of LIPCA on changes in lift and drag were quantitatively identified
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.306-308.1157.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Design and Test of Flapping Device Mimicking Insect Flight (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 306-308 (Mar. 2006), p. 1163-1168 
    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 detail design and demonstration of an insect-mimicking flappingwing mechanism composed of LIPCA (Lightweight Piezo-Composite Actuator) and linkage system that can amplify the actuation displacement of LIPCA. The angular amplification of the linkage system can provide various flapping angles by adjusting the actuation point of the LIPCA. The device can generate flapping frequency ranging from 5 to 50 Hz depending on weight of the wing and linkages. Flapping tests using different wing mass, area, and aspect ratio were performed to investigate the flapping performance. The test results were described and compared with the estimation. It was found that changes in wing mass, area, and aspect ratio result in significant variation of natural flapping-frequency
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.306-308.1163.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Design and Manufacturing of IDEAL with Stacked Ceramic Layers and Inter-Digitated Electrodes (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 306-308 (Mar. 2006), p. 1175-1180 
    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 development of stacked ceramic thin actuation layer IDEAL (Inter-Digitated Electrode Actuation Layer) using d33 actuation mechanism of piezoelectric ceramic. Most of the thin piezoelectric actuators are operated with d31 actuation mechanism. Many kinds of piezoelectric ceramic actuators are strived now to improve the actuation performance. One of efforts to improve performance of piezoceramic actuators is the research trying to develop an actuator using the piezoelectric coefficient d33. The piezoelectric coefficient d33 is almost twice larger than piezoelectric coefficient d31. Therefore, the induced strain of PZT thin layer with d33 actuation mechanism is bigger than that with d31 actuation mechanism. The AFC and LaRC-MFC used d33 actuation mechanism with surface interdigitated electrode to enhance its actuation performance. But their actuation mechanism is not perfect d33 actuation mechanism since the interdigitated electrodes are placed at the surface of the actuation layer. In this research, the stacked ceramic thin actuation layer with imbedded inter-digitated electrodes is designed and manufactured. The actuation strain of stacked ceramic thin actuation layer is measured and compared with the actuation strain of the LaRC-MFC. The comparison shows that the developed stacked ceramic thin actuation layer can produce 10% more actuation strain than LaRC-MFC at relatively high electric field
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.306-308.1175.pdf
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