• Title/Summary/Keyword: Piezoelectric energy harvesting

Search Result 237, Processing Time 0.051 seconds

Multilayer Piezoelectric Energy Harvester and Charging Property in Capacitor (다층형 압전세라믹 발전기 제작 및 capacitor 충전 특성)

  • Kim, Hyung-Chan;Song, Hyun-Cheol;Lee, Ju-Young;Jeong, Dae-Yong;Kim, Hyun-Jae;Yoon, Seok-Jin;Ju, Byeong-Kwon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2007.11a
    • /
    • pp.301-302
    • /
    • 2007
  • Energy harvesting from the vibration through the piezoelectric effect has been studied for powering the wireless sensor node. For the driving wireless sensor node, the generated energy is required to store the capacitor or battery. For the rapid charging, higher voltage than battery's capacity voltage and a large current are necessitated. However, the piezoelectric energy harvester is generally featured as a high voltage and low current generator. As it is known that the generated current in the piezoelectric energy harvester is related to an area of electrode of piezoelectric ceramics, we fabricated the multilayer ceramics to increase effective area for the faster charging. The energy harvesting properties and charging characteristics of multilyaer ceramics were investigated and discussed.

  • PDF

Analysis and simulation of multi-mode piezoelectric energy harvesters

  • Zhang, Ying;Zhu, Binghu
    • Smart Structures and Systems
    • /
    • v.9 no.6
    • /
    • pp.549-563
    • /
    • 2012
  • Theoretical analysis is performed on a multi-mode energy harvester design with focus on the first two vibration modes. Based on the analysis, a modification is proposed for designing a novel adaptive multi-mode energy harvester. The device comprises a simply supported beam with distributed mass and piezoelectric elements, and an adaptive damper that provides a 180 degree phase shift for the motions of two supports only at the second vibration mode. Theoretical analysis and numerical simulations show that the new design can efficiently scavenge energy at the first two vibration modes. The energy harvesting capability of the multi-mode energy harvester is also compared with that of a cantilever-based energy harvester for single-mode vibration. The results show that the energy harvesting capacity is affected by the damping ratios of different designs. For fixed damping ratio and design dimensions, the multi-mode design has higher energy harvesting capacity than the cantilever-based design.

Study of Mechanical Modeling of Oval-shaped Piezoelectric Energy Harvester (타원형 압전 에너지 하베스터의 기계적 모델링 연구)

  • Choi, Jaehoon;Jung, Inki;Kang, Chong-Yun
    • Journal of Sensor Science and Technology
    • /
    • v.28 no.1
    • /
    • pp.36-40
    • /
    • 2019
  • Energy harvesting is an advantageous technology for wireless sensor networks (WSNs) that dispenses with the need for periodic replacement of batteries. WSNs are composed of numerous sensors for the collection of data and communication; hence, they are important in the Internet of Things (IoT). However, due to low power generation and energy conversion efficiency, harvesting technologies have so far been utilized in limited applications. In this study, a piezoelectric energy harvester was modeled in a vibration environment. This harvester has an oval-shaped configuration as compared to the conventional cantilever-type piezoelectric energy harvester. An analytical model based on an equivalent circuit was developed to appraise the advantages of the oval-shaped piezoelectric energy harvester in which several structural parameters were optimized for higher output performance in given vibration environments. As a result, an oval-shaped energy harvester with an average output power of 2.58 mW at 0.5 g and 60 Hz vibration conditions was developed. These technical approaches provided an opportunity to appreciate the significance of autonomous sensor networks.

On the vibration and energy harvesting of the piezoelectric MEMS/NEMS via nonlocal strain gradient theory

  • Zohre Moradi;Farzad Ebrahimi;Mohsen Davoudi
    • Advances in nano research
    • /
    • v.15 no.3
    • /
    • pp.203-213
    • /
    • 2023
  • The possibility of energy harvesting as well as vibration of a three-layered beam consisting of two piezoelectric layers and one core layer made of nonpiezoelectric material is investigated using nonlocal strain gradient theory. The three-layered nanobeam is resting on an elastic foundation. Hamilton's principle is used to derive governing equations and associated boundary conditions. The generalized differential quadrature method (GDQM) was used to discretize the equations, and the Newmark beta method was used to solve them. The size-dependency of the elastic foundation is considered using two-phase elasticity. The equations, as well as the solution procedure, are validated utilizing some compassion studies. This work can be a basis for future studies on energy harvesting of small scales.

Micro Power Properties of Harvesting Devices as a Function of PZT cantilever length and gross area (PZT 캔틸레버의 길이와 면적에 따른 에너지 하베스팅 장치의 출력 특성)

  • Kim, I.S.;Joo, H.K.;Song, J.S.;Kim, M.S.;Jeong, S.J.;Lee, D.S.
    • Proceedings of the KIEE Conference
    • /
    • 2008.07a
    • /
    • pp.1246-1247
    • /
    • 2008
  • With recent advanced in portable electric devices, wireless sensor, MEMS and bio-Mechanics device, the new typed power supply, not conventional battery but self-powered energy source is needed. Particularly, the system that harvests from their environments are interests for use in self powered devices. For very low powered devices, environmental energy may be enough to use power source. Therefore, in other to made piezoelectric energy harvesting device, PMN-PZT thick film was formed by the screen printing method on the Ag/Pd coated alumina substrate. The layer was 8 layers and slurry where a-terpineol, ethycellulose, ferro B-75001 as Vehicle, PMN-PZT powder used are fabricated by ball mill. The output power quality was be also investigated by changing the load resistance, weight and frequency. The made piezoelectric energy harvesting device was resulted from the conditions of 33$k{\Omega}$, 0.25g, 197Hz respectively. The thick film was prepared at the condition of 2.75Vrms, and its power was 230${\mu} W$ and its thickness was 56${mu}m$. The piezoelectric energy harvesting device output voltage was increased, when the load weight, load resistance was increasing and resonance frequency was diminishing. The other side, resonance frequency was diminished, when the weight was increasing. And output power was continuously it changed by load resistance, output voltage, weight and resonance frequency.

  • PDF

A High Efficient Piezoelectric Windmill using Magnetic Force for Low Wind Speed in Wireless Sensor Networks

  • Yang, Chan Ho;Song, Yewon;Jhun, Jeongpil;Hwang, Won Seop;Hong, Seong Do;Woo, Sang Bum;Sung, Tae Hyun;Jeong, Sin Woo;Yoo, Hong Hee
    • Journal of the Korean Physical Society
    • /
    • v.73 no.12
    • /
    • pp.1889-1894
    • /
    • 2018
  • An innovative small-scale piezoelectric energy harvester has been proposed to gather wind energy. A conventional horizontal-axis wind power generation has a low generating efficiency at low wind speed. To overcome this weakness, we designed a piezoelectric windmill optimized at low-speed wind. A piezoelectric device having high energy conversion efficiency is used in a small windmill. The maximum output power of the windmill was about 3.14 mW when wind speed was 1.94 m/s. Finally, the output power and the efficiency of the system were compared with a conventional wind power system. This work will be beneficial for the piezoelectric energy harvesting technology to be applied to the real world such as wireless sensor networks (WSN).

Mechanical Properties and Wind Energy Harvesting Characteristics of PZT-Based Piezoelectric Ceramic Fiber Composites (PZT계 압전 세라믹 파이버 복합체의 기계적 물성과 압전 풍력 에너지 하베스팅 특성)

  • Lee, Min-Seon;Park, Jin-woo;Jeong, Young-Hun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.34 no.2
    • /
    • pp.90-98
    • /
    • 2021
  • Piezoelectric ceramic fiber composite (PCFC) was fabricated using a planar electrode printed piezoelectric ceramic fiber driven in transverse mode for small-scale wind energy harvester applications. The PCFC consisted of an epoxy matrix material and piezoelectric ceramic fibers sandwiched by interdigitated electrode (IDE) patterned polyimide films. The PCFC showed an excellent mechanical performance under a continuous stress. For the fabrication of PCB cantilever harvester, five -PCFCs were vertically attached onto a flexible printed circuit board (PCB) substrate, and then PCFCs were serially connected through a printed Cu circuit. The energy harvesting performance was evaluated applying an inverted structure, which imples its free leading edge located at an open end but the trailing edge at a clamped end, to enhance strain energy in a wind tunnel. The output voltage of the PCB cantilever harvester was increased as the wind speed increased. The maximum output power was 17.2 ㎼ at a resistance load of 200 ㏀ and wind speed of 9 m/s. It is considered that the PCB cantilever energy harvester reveals a potential use for wind energy harvester applications.

Analytical Estimation of Power Generation from Dynamic Structure With Piezoelectric Element (압전재료가 부착된 동적 구조물로부터 발생되는 전기력의 해석적인 평가)

  • Oh, Jae-Eung;Yoon, Ji-Hyeon;Sim, Hyoun-Jin;Lee, You-Yub
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2007.05a
    • /
    • pp.263-263
    • /
    • 2007
  • In the future, self-contained sensors and processing units will need on-board, renewable power supplies to be truly autonomous. One way of supplying such power is through energy harvesting, processes by which ambient forms of energy are converted into electricity. One energy harvesting technique involves converting kinetic energy, in the form of vibrations, into electrical energy through the use of piezoelectric materials. Researchers are currently investigating how piezoelectric materials can be used to harvest power. This study examines the use of auxiliary structures, consisting of a mechanical fixture and a lead zirconate/lead titanate (PZT) piezoelectric element, which can be attached to any boundary conditions vibrating beam of the any boundary conditions. Adjusting various boundary conditions of these structures can maximize the strain induced in the attached PZT element and improve power output.

  • PDF

Research on the Efficiency Improvement of the Cymbal-type Piezoelectric Energy Harvester (심벌형 압전 에너지 하베스터 에너지 수율 향상 연구)

  • Na, Yeong-Min;Park, Jong-Kyu
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.16 no.1
    • /
    • pp.70-76
    • /
    • 2017
  • The pollution problem of fossil energy sources has caused the development of green energy harvesting systems. Piezoelectric energy harvesting technology has been developed under those external environmental factors. A piezoelectric energy harvester can be defined as a device which transforms mechanical vibration or impact energy into electrical energy. Most researches have focused on bender structures. However, these have a limitation on energy efficiency because of the small effective electromechanical coupling factor, around 10%. Therefore, we should look for a new design for energy harvesting. A cymbal energy harvester can be a good candidate for the high-power energy harvester because it uses a high amplification mechanism using endcaps while keeping a higher electromechanical coupling factor. In this research, we focused on energy efficiency improvements of the cymbal energy harvester by changing the polarization direction, because the electromechanical coupling factor of the k33 mode and the k15 mode is larger than that of the k31 mode. Theoretically, we checked the cymbal harvester with radial polarization and it could obtain 6 times larger energy than that with the k31 direction polarization. Furthermore, we verified the theoretical expectation using the finite element method program. Consequently, we could expect a more efficient cymbal harvester with the radial polarization by comparing two polarization directions.

Green Energy Harvester using a Piezoelectric Regenerated Paper (압전종이를 이용한 그린에너지 하베스터)

  • Koh, Hyun-Woo;Kwon, Yeon-Ho;Yun, Gyu-Young;Kim, Joo-Hyung;Kim, Jae-Hwan
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2009.10a
    • /
    • pp.198-201
    • /
    • 2009
  • Due to piezoelectric property of regenerated cellulose paper, a green energy harvester using an electro-active paper (EAPap) was studied. In order to design the green energy harvester, we simulated cymbal type energy harvesting structures for single and multi-stacked layers of EAPap films. From the simulation, the optimized material orientation, thickness of harvesting structure was selected. By measuring of the induced output voltage by applying stress on energy harvester will be explained in detail. Therefore we propose the feasibility of the nature-friendly piezoelectric EAPap as a new green energy harvesting material.

  • PDF