• Title/Summary/Keyword: bending actuator

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Investigations on ionic polymer actuators based on irradiation-crosslinked sulfonated poly(styrene-ran-ethylene)

  • Wang, Xuan-Lun;Oh, Il-Kwon;Xu, Liang
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2009.10a
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    • pp.316-317
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    • 2009
  • The ion-exchange membrane, Nafion, remains as the benchmark for a majority of research and development in IPMC technology. In this research, we employed a novel ionomer named by sulfonated poly(styrene-ran-ethylene) (SPSE) that is crosslinked by UV irradiation. The sulfonic acid groups were stable during the UV irradiation crosslinking process. Water uptake, ion exchange capacity, and proton conductivity are characterized for both pure SPSE and crosslinked SPSE membrane. The bending responses of SPSE actuators under both direct current (DC) and alternating current (AC) excitations were investigated. The voltage-current behaviors of the actuators under AC excitations are also measured. Results showed the crosslinked SPSE actuators have better electromechanical performance than that of pure SPSE actuator with regard to tip displacement as a novel smart material.

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A Mathematical Approach for Modal Frequency Analysis in Actuators (운동방정식 유도에 의한 액추에이터 모드 주파수 분석)

  • Lee, Kyung Taek
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.23 no.6
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    • pp.537-545
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    • 2013
  • In this paper, the vibration for actuators having lens module, confined to lateral and torsional directions of suspensions, is described by mathematically analyzing its suspension configuration and motion. In order to prove the accuracy of this result, it is compared to a finite element analysis. Also it is shown that modal frequencies can be modified by changing design parameters in mathematical motion expressions.

Mathematical modeling of actively controlled piezo smart structures: a review

  • Gupta, Vivek;Sharma, Manu;Thakur, Nagesh
    • Smart Structures and Systems
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    • v.8 no.3
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    • pp.275-302
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    • 2011
  • This is a review paper on mathematical modeling of actively controlled piezo smart structures. Paper has four sections to discuss the techniques to: (i) write the equations of motion (ii) implement sensor-actuator design (iii) model real life environmental effects and, (iv) control structural vibrations. In section (i), methods of writing equations of motion using equilibrium relations, Hamilton's principle, finite element technique and modal testing are discussed. In section (ii), self-sensing actuators, extension-bending actuators, shear actuators and modal sensors/actuators are discussed. In section (iii), modeling of thermal, hygro and other non-linear effects is discussed. Finally in section (iv), various vibration control techniques and useful software are mentioned. This review has two objectives: (i) practicing engineers can pick the most suitable philosophy for their end application and, (ii) researchers can come to know how the field has evolved, how it can be extended to real life structures and what the potential gaps in the literature are.

Dynamic Characteristics of Ionic-Polymer-Metal-Composite (IPMC의 동적 특성)

  • Jeon, J.H.;Shin, D.G.;Lee, K.H.;Oh, I.K.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2005.05a
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    • pp.356-359
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    • 2005
  • Ionic-polymer-metal-composite(IPMC), one of new actuation materials of electroactive polymers plated with noble metallic electrodes is known for the fast bending upon electric field. The IPMC strip bends towards anode under electrical field. It has many merits of low driving voltage, quick responsiveness, high durability, possibility of miniaturizability. In this paper, we studied for developing the large deflection of IPMC according several fabricating parameters. We measured the large deflection by the different process of sandpaper and sandblasting in surface treatment, the initial compositing process and the surface electroding process, and the different counter ions in ion exchanging process. In fundamental, the displacement of IPMC strip depends on voltage magnitude and applied signal frequency and its maximum deformation is observed at a critical frequency, resonant frequency.

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Vibration Control of Laminated Composite Beams Using Active Constrained Layer Damping Treatment (능동구속감쇠 기법을 이용한 복합적층보의 진동 제어)

  • 강영규;최승복
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.11 no.7
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    • pp.261-266
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    • 2001
  • The flexural vibration of laminated composite beams with active and passive constrained layer damping has been investigated to design a structure with maximum possible damping capacity. The equations of motion are derived fro flexural vibrations of symmetrical,. multi-layer laminated beams. The damping ratio and model damping of the first bending mode are calculated by means of iterative complex eigensolution method. The direct negative velocity feedback control is used for the active constrained layer damping. It is shown that the flexible laminated beam is more effective in the vibration control for both active and passive constrained layer damping. and this paper addresses a design strategy of laminated composite under flexural vibrations with constrained layer damping.

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Effects of Elastic Energy of Thin Films on Bending of a Cantilevered Magnetostrictive Film- Substrate System

  • Si, Ho-Mun;Chongdu Cho;Kim, Chang-Boo
    • Journal of Mechanical Science and Technology
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    • v.18 no.4
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    • pp.622-629
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    • 2004
  • In this paper, effects of elastic energy of magnetostrictive film on the deflection of a cantilevered film-substrate system are investigated. The total energy including the elastic energy of magnetostrictive film is formulated. And it is minimized to give the curvatures and the position of neutral axis of the cantilevered system. To discuss the effects of the elastic energy of film in a measured system, three magnetostrictive unimorph cantilevers and a bimorph cantilever reported elsewhere are reviewed. It is shown that the assumption, since the thickness of film is much smaller than that of substrate the film elastic energy is negligible, can cause considerable error in evaluating magnetostrictive coefficients. Not the ratio of thicknesses but elastic energies between film and substrate is also shown to play important role in making decision whether the assumption is valid or not.

Ionic Polymer-Metal Composite Actuator with Increased Air-Operating stability by Using Ionic Liquids

  • Lee, Jang-Yeol;Han, Man-Jae;Lee, Sung-Won;Park, Sun-Jin;Yoon, Bye-Ri;Jho, Jae-Young
    • Proceedings of the Polymer Society of Korea Conference
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    • 2006.10a
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    • pp.246-246
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    • 2006
  • Ionic polymer-metal composite (IPMC) soaked with various ionic liquids was prepared by using polystyrene sulfonic acid-grafted poly(vinylidene fluoride-co-hexafluoropropylene) as ion-exchange membrane (IEM). The prepared IPMCs were effectively deformed three times larger and actuated for 300 times longer than those of Nafion with water at the same applied conditions. The experimental results indicated than the increase in the bending capability can be caused by the increase in the improved properties of the IEMs and ionic liquids such as uptake content and ionic conductivity. And air-operating stability of the IPMCs is appreciably governed by various physical and electrochemical properties of soaked solvents in IEMs.

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Characterization of Ionic-Polymer Metal Composite Actuators Varying Electroless Plating Method of Platinum (백금 무전해 도금 방법의 변화에 따른 이온성 고분자 및 금속 복합체 액추에이터의 특성 분석)

  • 차승은;김병목;조성환;이승기;박정호;김병규
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.51 no.12
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    • pp.601-607
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    • 2002
  • IPMC(Ionic Polymer Metal Composite)actuators were optimized for producing improved forces by changing multiple parameters including repetition of number of plating, surface electroding and additive(PVP)-treatment on reduction. The platinum electrode is deposited on the surface of the material where platinum particle stay in a dense form that appears to introduce a significant level of surface electrode resistance. Actuation tests were performed for such IPMC actuators under a low voltage. The test results show that the lower surface-electrode resistance generates higher actuation capability in the IPMC actuators. In order to investigate relaxation behavior of bending and repeatability in dry condition, the IPMC was coated by$rubber(KRATON^{TM})$to minimize the effect of water evaporation from IPMC. This actuator can be used in air with surface coating to avoid membrane drying.

Active Vibration Control of Plate using PZT (압전세라믹 액츄에이터를 이용한 평판의 능동 진동 제어)

  • Kim, Joon-Kook;Choi, Soo-Young;Cho, Yong-Suk;Park, Ki-Heon
    • Proceedings of the KIEE Conference
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    • 2004.07d
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    • pp.2389-2391
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    • 2004
  • This paper is concerned with the active vibration control of plate system using electromagnetic force actuator. The transfer function from the force input to the bending displacement was obtained via modal analysis results. Control algorithm are proposed and implemented on the experimental setups to show their efficacy. In this paper, the genetic algorithm is used to design a $H_2$ controller. Effectiveness and performance of the designed controller were verified by simulation and experiment results.

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Strain Sensor Application using Cellulose Electro-Active Paper (EAPap) (셀룰로오스 기반 Electro-Active Paper (EAPap)를 이용한 변형률 센서 응용)

  • Jang, Sang-Dong;Lee, Sang-Woo;Kim, Joo-Hyung;Kim, Jae-Hwan
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2009.04a
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    • pp.462-465
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    • 2009
  • Cellulose based electro-active paper (EAPap) is a new smart material that has a potential to be used in biomimetic actuator and sensor. Beside of the natural abundance, cellulose EAPap is fascinating with its biodegradability, lightweight, high mechanical strength and low actuation voltage. An actuating mechanism of EAPap is revealed to be the combination of ion migration effect and piezoelectricity. EAPap can generate the electrical current and voltage when the mechanical stress applied due to its electro-mechanical characteristics. In this paper, we investigated the feasibility of EAPap as a mechanical strain sensor.

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