Mechanical energy conversion systems for triboelectric nanogenerators: Kinematic and vibrational designs

Kim, Wook; Bhatia, Divij; Jeong, Shinkyu; Choi, Dukhyun

doi:10.1016/j.nanoen.2018.11.056

Cited by 84 publications

(40 citation statements)

References 91 publications

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“…Owing to the recent advances and the rapid development in soft materials and micro-electromechanical system (MEMS) fabrication, the emerging field of wearable flexible electronic devices offers a technological solution to measure the sEMG of the face, jaw, neck, etc. [11][12][13][14][15][16][17][18][19][20][21][22][23] . One of the major trends is to apply textiles made of functional yearns and coatings or to use flexible materials to fabricate devices for detecting physiological signals [24][25][26] , conducting drug delivery 27 , and realizing intuitive humanmachine interfaces [28][29][30][31] .…”

Section: Introductionmentioning

confidence: 99%

An epidermal sEMG tattoo-like patch as a new human–machine interface for patients with loss of voice

Liu

Dong

et al. 2020

Microsyst Nanoeng

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Throat cancer treatment involves surgical removal of the tumor, leaving patients with facial disfigurement as well as temporary or permanent loss of voice. Surface electromyography (sEMG) generated from the jaw contains lots of voice information. However, it is difficult to record because of not only the weakness of the signals but also the steep skin curvature. This paper demonstrates the design of an imperceptible, flexible epidermal sEMG tattoo-like patch with the thickness of less than 10 μm and peeling strength of larger than 1 N cm −1 that exhibits large adhesiveness to complex biological surfaces and is thus capable of sEMG recording for silent speech recognition. When a tester speaks silently, the patch shows excellent performance in recording the sEMG signals from three muscle channels and recognizing those frequently used instructions with high accuracy by using the wavelet decomposition and pattern recognization. The average accuracy of action instructions can reach up to 89.04%, and the average accuracy of emotion instructions is as high as 92.33%. To demonstrate the functionality of tattoo-like patches as a new human-machine interface (HMI) for patients with loss of voice, the intelligent silent speech recognition, voice synthesis, and virtual interaction have been implemented, which are of great importance in helping these patients communicate with people and make life more enjoyable.

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Section: Introductionmentioning

confidence: 99%

An epidermal sEMG tattoo-like patch as a new human–machine interface for patients with loss of voice

Liu

Dong

et al. 2020

Microsyst Nanoeng

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“…Because the purpose of this paper is to increase the output power of the energy harvester, it is only necessary to establish an equivalent circuit model of the generating stage. According to the obtained model of the generating stage in Equations (2) and (3), the mechanical and electrical parts of the generating stage can be modeled as electrical components, and the electromechanical coupling can be replaced by an ideal transformer [7]. The single-degree-of-freedom equivalent circuit model obtained is shown in Figure 4.…”

Section: Equivalent Circuit Modelmentioning

confidence: 99%

“…Converting vibration energy into electrical energy is a new research hotspot [3,4]. Typically, vibration energy harvesters are classified as electrostatic [5], piezoelectric [6], triboelectric [7], and electromagnetic [8]. Among these, piezoelectric vibration energy harvesters are increasingly being used to power sensor nodes, due to their simple operation and high energy density.…”

Section: Introductionmentioning

confidence: 99%

Improved Interface Circuit for Enhancing the Power Output of a Vibration-Threshold-Triggered Piezoelectric Energy Harvester

et al. 2020

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The vibration-threshold-triggered piezoelectric energy harvester is a new type of piezoelectric energy harvester with a two-stage structure, which can generate electricity in a low frequency environment and recognize vibration intensity at the same time. In this study, a theoretical model of a vibration-threshold-triggered energy harvester was examined, and an equivalent circuit model of the energy harvester was obtained. Then, an interface circuit was proposed that can significantly improve the output power of the energy harvester. The interface circuit achieved impedance matching with the piezoelectric material to maximize the energy collected from the energy harvester. First, we calculated and analyzed the impedance characteristics of the energy harvester, based on the equivalent circuit model. It was found that because the piezoelectric material is in resonance as the energy harvester is in operation, the corresponding impedance is almost resistance. Therefore, a resistance-matching strategy was proposed. Last, we proposed an interface circuit with adjustable input impedance to achieve resistance matching. The experimental results show that the proposed interface circuit can increase the output power of the energy harvester by 48.1–55.7% over that achieved with the standard interface circuit.

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“…Searching for renewable energy sources and development of renewable energy technologies are required for sustainable development of the human civilization . The ubiquitous ambient mechanical energy becomes a potential alternative source to address this issue, which has attracted considerable attention over the past decades …”

Section: Introductionmentioning

confidence: 99%

Robust Triboelectric Nanogenerator with Ratchet‐like Wheel‐Based Design for Harvesting of Environmental Energy

Gao

Xie

et al. 2019

Adv Materials Technologies

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In this study, a ratchet‐like wheel‐based and spring‐assisted sustainable triboelectric nanogenerator (RS‐TENG) is fabricated for an efficient harvesting of rotational motion. The multitooth structure of the ratchet‐like wheel and force of the spring are used to convert the rotational motion induced by mechanical energy in the environment (such as wind energy) into a reciprocating linear motion of the movable parts, making two triboelectric layers of each sub‐triboelectrification unit produce contact–separation motion to achieve power output. The power output of one subunit is ≈0.37 mW at a uniform speed of 60 rpm, and the power output can increase to 6.05 mW by parallel connection of six subunits. The RS‐TENG with parallel connection of six subunits exhibits an open‐circuit voltage of 320 V throughout the 8 h of continuous operation (≈345 600 contact–separation events), reflecting its excellent durability and robustness. The thermometer can be stably powered at a wind speed of 15.5 m s−1 by the rectifier circuit and a 330 µF commercial capacitor. The above experiments show that RS‐TENG can not only harvest the mechanical energy around the environment for self‐powered sensing, but also exhibit an improved output performance and outstanding robustness.

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Mechanical energy conversion systems for triboelectric nanogenerators: Kinematic and vibrational designs

Cited by 84 publications

References 91 publications

An epidermal sEMG tattoo-like patch as a new human–machine interface for patients with loss of voice

An epidermal sEMG tattoo-like patch as a new human–machine interface for patients with loss of voice

Improved Interface Circuit for Enhancing the Power Output of a Vibration-Threshold-Triggered Piezoelectric Energy Harvester

Robust Triboelectric Nanogenerator with Ratchet‐like Wheel‐Based Design for Harvesting of Environmental Energy

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