• Title, Summary, Keyword: vibration energy

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A study of vibration energy harvesting for the bimorph piezoelectric sensor (바이몰프 압전센서의 진동에너지 수확에 관한 연구)

  • Kim, Yong-Hyuk
    • Journal of Sensor Science and Technology
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    • v.19 no.4
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    • pp.313-319
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    • 2010
  • Vibration energy harvesting is an attractive technique for potential powering of low power devices such as wireless sensors and portable electronic applications. Most energy generator developed to date are single vibration frequency based, and while some efforts have been made to broaden the frequency range of energy harvester. In this work, The effect of energy harvesting were investigated at various vibration frequencies, vibration beams, vibration point and test masses. The maximum output voltage of the bimorph piezoelectric cantilever was shifted according to vibration point. Vibration frequency with maximum output voltage decreased with the increasing length of vibration beam and increasing test mass. The sample with vibration beam length 0.5 L generated a peak output voltage of 32 $V_{rms}$ and shows a 45 % increase in voltage output in comparison to the corresponding original bimorph. It was found that a piezoelectric bimorph has a possibility to be as the energy harvesting cantilever, which is successfully tuned over a vibration frequency range to enable a maximum harvesting energy.

The research of energy harvester's the wideband vibration system from bridge for wireless sensor applications (교량 무선센서 전원공급용 전자기를 이용한 광대역 에너지 하베스트의 진동시스템에 관한 연구)

  • Han, Ki-Bong;Shin, Dong-Chan;Kim, Young-Cheol
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.819-824
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    • 2012
  • This paper presents the wideband vibration system of an electromagnetic vibration energy harvester that obtained electric power for wireless sensor applications from the ever-change vibrations of bridge. It is a system with two degree of freedom vibrations that are composed of two mass and two spring respectively. One system is housing mass and spring, the other is the magnetic mass and spring that is the vibration system construction's element of electromagnetic vibration energy harvester. In other words, it is called dynamic vibration absorber. This paper show that the ratio of housing mass to magnetic mass decides the bandwidth and the size of amplitude of magnetic mass in electromagnetic vibration energy harvester. Therefore, it is necessary to improve the efficiency of energy in electromagnetic vibration energy harvester for wireless sensor applications.

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Fabrication and Microstructures of Al-Pb Alloy in the Ultrasonic Vibration (초음파진동 조사장 내에서 Al-Pb계 합금의 제조 및 조직)

  • Park, Hun-Berm
    • Journal of Korea Foundry Society
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    • v.22 no.5
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    • pp.238-244
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    • 2002
  • Water and oil were completely synthesised with ultrasonic vibration energy irradiation. Pure Pb were added into Al melt during irradiated the ultrasonic vibration energy in 750. And the ultrasonic vibration energy was applied to Al-Pb melt to enhance the miscibility. Microstructural analysis, thermal analysis and X-ray diffraction analysis were carried out to evaluate the effect of the ultrasonic vibration energy on the castability and microstructural reliability. (1) Using the ultrasonic vibration energy irradiation, the complete mixing of water and oil was obtained. (2) The microstructure was refined by the application of ultrasonic vibration energy in Al-Pb alloys. (3) Relatively large Pb particles, $5{\mu}m$ were most distributed alone the grain boundaries with fine Pb particles evenly distributed in the matrix. (4) The solubility of Ph in Al-Pb alloys was increases up to 5% with the application of ultrasonic vibration energy.

Vibration Characteristics of the Axially Moving Continuum with Time-Varying Length: Spagetti Problem (축방향으로 이동하며 길이가 변하는 연속체의 진동특성: 스파게티 문제에 응용)

  • 사재천;이승엽;이민형
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.385-392
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    • 2001
  • Time-dependent frequency and energy of free vibration of the Spagetti problem, that is the axially moving continuum with time-varying length, are investigated. Exact expressions for the natural frequency and time-varying vibration energy are derived by dealing with traveling waves. When the string length is increased, the vibration period increases, but the free vibration energy varies as a function of both translating velocity and boundary velocity of the continuum. However, when the string undergoes retraction, the vibration energy increases with time, String tension together with non-zero instantaneous velocity at the moving boundary results in energy variation.

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Free Vibration Characteristics of a String with Time-Varying Length (길이가 변하는 현의 자유진동 특성)

  • 이승엽;박상규
    • Journal of KSNVE
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    • v.9 no.5
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    • pp.906-913
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    • 1999
  • Time-dependent period and energy of free vibration of a string, whose length varies with time at a constant rate, are investigated by a traveling wave method. When the string length is increased, the vibration period increase, but the free vibration energy decrease with time. However, when the string undergoes retraction, the vibration energy increases with time. String tension together with non-zero instantaneous velocity at the moving boundary results in energy variation. Analytical solutions by the traveling wave method are compared with previous results using the perturbation method and Kotera's approach.

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Measurement on Vibration Mode of Tire Wheel as a Energy Source of Micro Power (초소형 동력 에너지원으로서의 타이어 휠 진동 모드 측정)

  • Shin, You-Hwan;Lee, Yoon-Pyo
    • Transactions of the Korean hydrogen and new energy society
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    • v.20 no.1
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    • pp.64-72
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    • 2009
  • In order to convert efficiently vibration energy of a car tire wheel into electrical power by using piezoelectric materials, the design of the materials must be performed for the dynamic characteristics of the piezoelectric materials to be matched with them of the vibration energy sources well. An accelerometer was installed on the tire wheel with a slip ring to investigate the dynamic mode of the wheel as one of the vibration energy sources. During road test, the measurement on the vibration mode of the tire wheel was performed with variations of car speed and road condition. The experimental data were analyzed details for availability as a micro power source for wireless TPMS(Tire Pressure Monitoring System).

The research of wide band vibration energy harvester using ocean wave (파도를 이용한 광대역 진동에너지 하베스터에 대한 연구)

  • Han, Ki-Bong;Lee, Hyoung-Woo
    • Journal of the Korean Society of Marine Engineering
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    • v.37 no.6
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    • pp.596-602
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    • 2013
  • In general, existed vibration energy harvester is optimum in electronic energy gleaned from vibration energy with fixed single frequency, because it is using resonance. But it is limit in electronic energy gleaned from ocean wave energy with variant frequency. This paper studied for width band vibration energy harvester that obtains electronic energy from ocean wave with infinite vibration energy in order to solve it. It is composed of buoy to occur resonance in the center frequency of ocean wave energy and the vibration system to occur resonance in the same frequency. As a result, existed vibration energy harvester using resonance maximized electronic energy conversion efficiency in single frequency, while proposed width band vibration energy harvester has merit that maximized electronic energy conversion efficiency in ocean wave with variant frequency.

A Basic Experimental Study on Vibration Power Generation Using Bridge Vibration (교량의 진동을 이용한 진동력 발전 기초실험연구)

  • Jo, Byung-Wan;Lee, Yun-Sung;Kim, Yung-Ji;Yoon, Kwang-Won
    • International Journal of Highway Engineering
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    • v.12 no.4
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    • pp.121-129
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    • 2010
  • Through this paper, we studied on the basic concept of vibration-induced power generation for urban infrastructures. Since the travelling of automobiles on the bridge cause vibration, it is possible to convert the vibration energy into green-electric energy by utilizing magnetic induction technology. In this paper we define the concept of green-bridge vibration power generation system which contains the concept of magnetic induction technology and propose a vibration power generation device for converting the bridge vibration energy into the electric energy. Also, an experiment was held by applying the vibration power generator on a real bridge. The results showed the applicability and effectiveness of the vibration power generator.

Broadband Piezoelectric Vibration Energy Harvester Using Pole-Zero Cancellation Technique (극점-영점 상쇄 기법을 이용한 광대역 압전 진동 에너지 하베스터)

  • Kim, Gi-Woo
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.24 no.2
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    • pp.87-92
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    • 2014
  • This paper presents a new design for a piezoelectric energy harvester with the potential to harvest vibration energy over a wide range of excitation frequencies, particularly beyond the resonance frequency. The piezoelectric vibration energy harvester employs the concept of pole-zero cancellation occurring in a lever type anti-resonant system. The experimental results show that the proposed energy harvester can provide the potential possibility of a broadband piezoelectric vibration energy harvester.

Identification and suppression of vibrational energy in stiffened plates with cutouts based on visualization techniques

  • Li, Kai;Li, Sheng;Zhao, De-You
    • Structural Engineering and Mechanics
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    • v.43 no.3
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    • pp.395-410
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    • 2012
  • The visualizing energy flow and control in vibrating stiffened plates with a cutout are studied using finite element method. The vibration intensity, vibration energy and strain energy distribution of stiffened plates with cutout at different excitation frequencies are calculated respectively and visualized for the various cases. The cases of different size and boundaries conditions of cutouts are also investigated. It is found that the cutout or opening completely changes the paths and distributions of the energy flow in stiffened plate. The magnitude of energy flow is significantly larger at the edges near the cutout boundary. The position of maximum strain energy distribution is not corresponding to the position of maximum vibrational energy. Furthermore, the energy-based control using constrained damping layer (CDL) for vibration suppression is also analyzed. According to the energy distribution maps, the CDL patches are applied to the locations that have higher energy distribution at the targeted mode of vibration. The energy-based CDL treatments have produced significant attenuation of the vibration energy and strain energy. The present energy visualization technique and energy-based CDL treatments can be extended to the vibration control of vehicles structures.