• Title, Summary, Keyword: Piezoelectric bender

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An Effective Quasi-static Modeling of the Piezoelectric Benders (압전 벤더의 효과적인 모델링 기법)

  • Park, Jong-Kyu;Moon, Won-Kyu
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.28 no.2
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    • pp.133-142
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    • 2004
  • In this article, the constitutive relations of three types of piezoelectric benders, which are a unimorph bender, a bimorph bender and a triple-layer bender, are derived based on the beam theory under the quasi-static equilibrium condition. The relation coefficients are described as the geometry and material properties of the benders. More general constitutive relations involving fixed-free, fixed-roll, and fixed-simply supported boundary conditions under the inconsistent length condition between the piezoelectric layer and the nonpiezoelectric one are discussed. The complicated constitutive relations can be easily calculated and checked by using the symbolic function in ‘Mathematica’. The relation coefficients for the benders are plotted in three dimensional graph using the developed program.

The Effective Modeling of Piezoelectric Actuator in Quasi-static Equilibrium Condition (준 평형 압전 구동기의 효과적 모델링 기법)

  • 박종규;문원규
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.768-771
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    • 2002
  • A method to derive the constitutive relations of a piezoelectric bender actuator is developed here. The constitutive relations are derived from the geometry, material properties of the actuator. The very complicated constitutive relations can be easily calculated by use of symbolic function in Mathematica. The developed program can calculate the constitutive relations for the unimorph bender made by attaching a short piezoelectric beam on a longer metal beam. The program can also calculate the constitutive relations of a piezoelectric bender with spring at its end.

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Study of Broadband Piezoelectric Harvester using the Bender-Type Module (벤더형 모듈을 이용한 광대역 압전 하베스터 연구)

  • Kim, Chang Il;Kwon, Tae Hyeong;Yeo, Seo Yeong;Yun, Ji Sun;Jeong, Young Hun;Hong, Youn Woo;Cho, Jeong Ho;Paik, Jong Hoo
    • Journal of Sensor Science and Technology
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    • v.27 no.2
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    • pp.112-117
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    • 2018
  • In this study, a bender-type piezoelectric energy harvester was fabricated and evaluated to compensate for the disadvantages of high-power generation only in the resonance frequency range of a piezoelectric harvester using a piezoelectric cantilever. The generated power was investigated according to various changes in the vibration environment. Compared with the piezoelectric cantilever module, the bender-type piezoelectric module showed a larger number of peak voltages. The primary peak voltage shifted toward the low frequency when the spring was coupled to the bender-type piezoelectric module. The harvester of the three bender-type modules had a vibration frequency exceeding 1 mW in the 34-45 Hz range and generated 3.112 mW of power at the vibration frequency of 38 Hz. The harvester of the six bender-type modules had a vibration frequency exceeding 1 mW in the 31-45 Hz range and generated 3.081 mW of power at the vibration frequency of 35 Hz.

A Study on Frequency Characteristics of a Bender Type High-Speed Piezoelectric Pneumatic Valve (벤더형 고응답 압전밸브의 주파수 특성에 관한 연구)

  • Yun, S.N.;Ham, Y.B.;Park, J.H.;Lee, S.S.
    • Journal of Drive and Control
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    • v.9 no.4
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    • pp.14-18
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    • 2012
  • Two kinds of piezoelectric actuator are applied to the valve for controlling the direction, the flow and the pressure of the fluid. One is a stack type piezoelectric actuator which has very fast response characteristics but very tiny displacement. The other is a bender type piezoelectric actuator which has also fast response characteristics but lower than the stack type one, and has longer displacement than the stack type one. So, the bender type piezoelectric actuator has advantage to apply to the valve for controlling a large amount of flow and fast on-off operating. In this study, the bender type piezoelectric pneumatic valve for color sorter is designed and fabricated. The new type high speed piezo valve with the both side supporting mechanism for high operating frequency and high reliability is discussed for separating the foreign body from the grains. Finally, the performance characteristics of a fabricated valve are analyzed and the frequency characteristics are also discussed for substituting the conventional type solenoid actuator.

Enhancement of Structural Safety Using Piezoelectric Bimorph

  • Loh, Byoung-Gook
    • International Journal of Safety
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    • v.6 no.1
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    • pp.22-25
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    • 2007
  • Damping out high frequency low amplitude structural vibrations using PZT bimorph is presented. Static and Dynamic analyses of the piezoelectric bimorph bender were performed. Three layer piezoelectric actuators were modeled with SOLID5 coupled-field elements using ANSYS. Static deflection and modal analyses of the piezoelectric bimorph bender are presented. Proper tuning of the values of the resistor and inductor in the shunt circuit is required for maximum vibration suppression.

Study on Design and Driving Characteristics of T-Shaped Piezoelectric Actuators (T형상 압전 엑추에이터의 설계 및 구동특성 연구)

  • Kim, Tae-Hoon;Park, Min-Ho;Jeong, Seong-Su;Jun, Ho-Ik;Cheon, Seong-Kyu;Park, Tae-Gone
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.32 no.1
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    • pp.30-34
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    • 2019
  • A newly proposed T-shape piezoelectric actuator, composed of piezoelectric benders, was designed and studied. This actuator has four legs, and can walk in both forward and backward directions. The piezoelectric actuator has a simple structure and can be easily fabricated. It consists of a piezoelectric bender and a joint. The piezoelectric bender is composed of carbon and ceramic materials. Therefore, there is an advantage in that it can be fabricated on a very small scale. Elliptical displacements of the piezoelectric actuators were analyzed by finite element analysis. Elliptical motion at the tip occurred at two voltages having a 90-degree phase difference. Based on the finite element analysis results, prototype actuators with maximum displacements were fabricated, and the characteristics of their movements were characterized.

Measurements of Dynamic Properties of Concrete Materials Using Bender Elements (벤더 엘리멘트를 이용한 콘크리트의 동적물성치 측정)

  • Yoo, Chang-Yeon;An, Ju-Ok;Shin, Woo-Seop;Mok, Young-Jin
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.546-549
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    • 2006
  • A series of seismic tests was carried out using piezoelectric elements called "bender elements". A pair of bender elements can be used as a source and a receiver respectively to measure dynamic properties of concrete. The most suitable bender elements were developed and implemented to measure P wave velocity changes due to the cracks of a concrete beam caused by bending.

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Bender-type Multilayer Piezoelectric Devices for Energy Harvesting (미소에너지 하베스팅용 적층 벤더 압전 소자 성능 연구)

  • Jeong, Soon-Jong;Kim, Min-Soo;Kim, In-Sung;Song, Jae-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.193-193
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    • 2008
  • Wearable and ubiquitous micro systems will be greatly growing and their related devices should be self-powered in order to avoid the replacement of finite power sources, for example, by scavenging energy from the environment. With ever reducing power requirements of both analog and digital circuits, power scavenging approaches are becoming increasingly realistic. One approach is to drive an electromechanical converter from ambient motion or vibration. Vibration-driven generators based on electromagnetic, electrostatic and piezoelectric technologies have been demonstrated. Among various generator types proposed so far, piezoelectric generator possesses considerable potential in micro system. To overcome low mechanical-to-electric energy conversion, the piezoelectric device should activate in resonance mode in response to external vibration. Normally, the external vibration excretes at low frequency ranging 0.1 to 200 Hz, whereas the resonant frequencies of the devices are fixed as constant. Therefore, keeping their resonant mode in varying external vibration can be one of important points in enhancing the conversion efficiency. We investigated the possibility of use of multi-bender type piezoelectric devices. To match the external vibration frequency with the device resonant frequency, the various devices with different resonant frequency were chosen.

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Experimental study on directivity of the elastic wave using bender elements (벤더엘리먼트에서 발생하는 탄성파의 방향성에 대한 실험적 연구)

  • Choi, Jong-Youn;Kim, Hyun-Ki;Cho, Nam-Jun
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.705-710
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    • 2010
  • Bender element is made of connecting two piezoelectric elements which have different polarities from each other, and is a kind of sensors which can be used either way as a source making elastic wave or a receiver. Elastic waves generated by stimulating the bender elements can be decomposed to P-wave and S-wave propagation. Numerical and expeimental studies are conducted, and results show that multiple measurements are recommended to determine wave arrivals from the received signals.

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