• Title, Summary, Keyword: Piezoelectric energy harvesting

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A Study on the Generating Characteristics Depending on Driving System of a Honeycomb Shaped Piezoelectric Energy Harvester (벌집형 압전 발전 소자의 구동방식에 따른 출력 특성)

  • Jeong, Seong-Su;Kang, Shin-Chul;Park, Tae-Gone
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.28 no.2
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    • pp.69-74
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    • 2015
  • Recently, energy harvesting technology is increasing due to the fossil fuel shortages. Energy harvesting is generating electrical energy from wasted energies as sunlight, wind, waves, pressure, and vibration etc. Energy harvesting is one of the alternatives of fossil fuel. One of the energy harvesting technologies, the piezoelectric energy harvesting has been actively studied. Piezoelectric generating uses a positive piezoelectric effect which produces electrical energy when mechanical vibration is applied to the piezoelectric device. Piezoelectric energy harvesting has an advantage in that it is relatively not affected by weather, area and place. Also, stable and sustainable energy generation is possible. However, the output power is relatively low, so in this paper, newly designed honeycomb shaped piezoelectric energy harvesting device for increasing a generating efficiency. The output characteristics of the piezoelectric harvesting device were analyzed according to the change of parameters by using the finite element method analysis program. One model which has high output voltage was selected and a prototype of the honeycomb shaped piezoelectric harvesting device was fabricated. Experimental results from the fabricated device were compared to the analyzed results. After the AC-DC converting, the power of one honeycomb shaped piezoelectric energy harvesting device was measured 2.3[mW] at road resistance 5.1[$K{\Omega}$]. And output power was increased the number of harvesting device when piezoelectric energy harvesting device were connected in series and parallel.

Modelling and experimental investigations on stepped beam with cavity for energy harvesting

  • Reddya, A. Rami;Umapathy, M.;Ezhilarasib, D.;Uma, G.
    • Smart Structures and Systems
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    • v.16 no.4
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    • pp.623-640
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    • 2015
  • This paper presents techniques to harvest higher voltage from piezoelectric cantilever energy harvester by structural alteration. Three different energy harvesting structures are considered namely, stepped cantilever beam, stepped cantilever beam with rectangular and trapezoidal cavity. The analytical model of three energy harvesting structures are developed using Euler-Bernoulli beam theory. The thickness, position of the rectangular cavity and the taper angle of the trapezoidal cavity is found to shift the neutral axis away from the surface of the piezoelectric element which in turn increases the generated voltage. The performance of the energy harvesters is evaluated experimentally and is compared with regular piezoelectric cantilever energy harvester. The analytical and experimental investigations reveal that, the proposed energy harvesting structures generate higher output voltage as compared to the regular piezoelectric cantilever energy harvesting structure. This work suggests that through simple structural modifications higher energy can be harvested from the widely reported piezoelectric cantilever energy harvester.

Experiments on Piezoelectric Energy Harvesting Device (압전체를 이용한 에너지 수집 장치 실험)

  • Jung, Moon-San;Kwak, Moon-K.;Kim, Ki-Young
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.360-368
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    • 2007
  • This paper is concerned with the development of piezoelectric energy harvesting device. Literature survey was carried out to investigate the state-of-art technology regarding piezoelectric energy harvesting method. It shows that the piezoelectric energy harvesting system has been researched as the needs for the auxiliary power system grow for ubiquitous sensor node. In this study, the piezoelectric energy harvesting system was constructed and the corresponding electric circuit was also built to investigate the power characteristics. Experimental results show that it can charge the small battery with ambient vibrations but still needs an effective mechanism to collect ambient energies.

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Recent Progress in Flexible Energy Harvesting Devices based on Piezoelectric Nanomaterials (압전나노소재 기반의 플렉서블 에너지 하베스팅 소자 연구동향)

  • Park, Kwi-Il
    • Journal of Korean Powder Metallurgy Institute
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    • v.25 no.3
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    • pp.263-272
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    • 2018
  • Recent developments in the field of energy harvesting technology that convert ambient energy resources into electricity enable the use of self-powered energy systems in wearable and portable electronic devices without the need for additional external power sources. In particular, piezoelectric-effect-based flexible energy harvesters have drawn much attention because they can guarantee power generation from ubiquitous mechanical and vibrational movements. In response to demand for sustainable, permanent, and remote use of real-life personal electronics, many research groups have investigated flexible piezoelectric energy harvesters (f-PEHs) that employ nanoscaled piezoelectric materials such as nanowires, nanoparticles, nanofibers, and nanotubes. In those attempts, they have proven the feasibility of energy harvesting from tiny periodic mechanical deformations and energy utilization of f-PEH in commercial electronic devices. This review paper provides a brief overview of f-PEH devices based on piezoelectric nanomaterials and summarizes the development history, output performance, and applications.

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.

Recent Research Trends of Flexible Piezoelectric Nanofibers for Energy Conversion Materials (에너지 변환 소재용 플렉서블 압전 나노섬유 연구 개발 동향)

  • Ji, Sang Hyun;Yun, Ji Sun
    • Ceramist
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    • v.22 no.2
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    • pp.122-132
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    • 2019
  • Wearable electronic devices with batteries must be lightweight, flexible and highly durable. Most importantly, the battery should be able to self-generate to operate the devices without having to be too frequently charged externally. An eco-friendly energy harvesting technology from various sources, such as solar energy, electromagnetic energy and wind energy, has been developed for a self-charging flexible battery. Although the energy harvesting from such sources are often unstable according to the surrounding environment, the energy harvesting from body movements and vibrations has been less affected by the surrounding environment. In this regard, flexible piezoelectric modules are the most attractive solution for this issue, because they convert mechanical energy to electrical energy and harvest energy from the human body motions. Among the various flexible piezoelectric modules, piezoelectric nanofibers have advantages when used as an energy harvester in wearable devices, due to their simple manufacturing process with good applicability to polymers and ceramics. This review focused on diverse flexible piezoelectric nanofibers and discusses their applications as various energy harvesting systems.

Design and Analysis of Piezoelectric Energy Harvesting Device Using Waves (파도를 이용한 압전 에너지 수확 장치의 설계 및 해석)

  • Na, Yeong-min;Lee, Hyun-seok;Kang, Tae-hun;Park, Jong-kyu;Park, Tae-gone
    • Korean Journal of Materials Research
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    • v.25 no.10
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    • pp.523-530
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    • 2015
  • Electricity generation through fossil fuels has caused environmental pollution. To solve this problem, research on new renewable energy (solar, wind, geothermal heat, etc.) to replace fossil fuels is in progress. These devices are able to consistently generate power. However, they have many drawbacks, such as high installation costs and limitations in possible set-up environments. Thus, piezoelectric harvesting technology, which is able to overcome the limitations of existing energy technologies, is actively being studied. Piezoelectric harvesting technology uses the piezoelectric effect which occurs in crystals that generate voltage when stress is applied. Therefore, it has advantages such as a wider installation base and lower technological cost. In this study, a piezoelectric energy harvesting device based on constant wave motion was investigated. This device can regenerate electricity in a constant turbulent flow in the middle of the sea. The components of the device are circuitry, a steel bar, an bimorph piezoelectric element and buoyancy elements. In addition, a multiphysical analysis coupled with the structure and piezoelectric elements was conducted to estimate the performance of the device. With this piezoelectric energy harvesting device, the displacement and electric power were analyzed.

Development of Piezoelectric Energy Harvesting Device activated by Wind (바람에 의해 구동되는 압전에너지 수집 장치 개발)

  • Lee, Haeng-Woo;Kwak, Moon-K.;Yang, Dong-Ho;Lee, Han-Dong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.76-77
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    • 2009
  • This paper is concerned with the development of the piezoelectric energy harvesting(PEH) device using Wind. In this study, the piezoelectric energy harvesting system consisting of a cantilever with a pinwheel and piezoelectric wafer was investigated in detail both theoretically and experimentally. The power output characteristics of the PEH was then calculated and discussed. Theoretical and experimental results showed that the PEH was able to charge a battery with ambient vibrations but still needed an effective mechanism which can convert mechanical energy to electrical energy and an optimal electric circuit which dissipates small energy.

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Development of Piezoelectric Energy Harvesting Device and Experiments (압전체를 이용한 에너지 수집 장치 개발 및 실험)

  • Kim, Ki-Young;Kwak, Moon-K.;Kang, Ho-Yong;Kim, Nae-Soo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.81-89
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    • 2008
  • This paper is concerned with the development of the piezoelectric energy harvesting(PEH) device for ubiquitous sensor node(USN). The USN needs auxiliary power to lengthen its operational life. In this study, the piezoelectric energy harvesting system consisting of a cantilever with a tip mass and piezoelectric wafer was investigated in detail both theoretically and experimentally. The dynamic model for the addressed system was derived using the assumed mode method. The resulting equations of motion were expressed in matrix form, which had never been developed before. The power output characteristics of the PEH was then calculated and discussed. Various experiments were carried out to investigate the charging characteristics of electrical components. Theoretical and experimental results showed that the PEH was able to charge a battery with ambient vibrations but still needed an effective mechanism which can convert mechanical energy to electrical energy and an optimal electric circuit which dissipates small energy.

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Dynamic Modeling of Piezoelectric Energy Harvesting Device and Experiments (압전 에너지 수집 장치의 동적모델링 및 실험)

  • Kwak, Moon-K.;Kim, Ki-Young;Kang, Ho-Yong;Kim, Nae-Soo
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.18 no.6
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    • pp.632-641
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    • 2008
  • This paper is concerned with the development of the piezoelectric energy harvesting(PEH) device for ubiquitous sensor node(USN). The USN needs auxiliary power to lengthen its operational life. In this study, the piezoelectric energy harvesting system consisting of a cantilever with a tip mass and piezoelectric wafer was investigated in detail both theoretically and experimentally. The dynamic model for the addressed system was derived using the assumed mode method. The resulting equations of motion were expressed in matrix form, which had never been developed before. The power output characteristics of the PEH was then calculated and discussed. Various experiments were carried out to investigate the charging characteristics of electrical components. Theoretical and experimental results showed that the PEH was able to charge a battery with ambient vibrations but still needed an effective mechanism which can convert mechanical energy to electrical energy and an optimal electric circuit which dissipates small energy.