Mechanics of flexible and stretchable piezoelectrics for energy harvesting

Chen, Ying; Lu, Bingwei; Ou, Ding Rong; Feng, Xue

doi:10.1007/s11433-015-5692-5

Cited by 17 publications

(4 citation statements)

References 78 publications

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“…柔性压电薄膜在端部加载下自由变形时的后屈曲变形及力电耦合理论, 得到了很多力学研究人员的关注和研究 [46, 63∼65] , 已经逐步成为一种通识. Chen 和 Su 等 [64,66] 在室内疲劳试验机上进行了数组实验, 在改变端部加载幅值、频率, 以及外接电阻等参数时, 测量的器件输出了电压曲线, 和理论结果吻合良好. Zhang 等 [67] 使用医学文献中心动周期内左心室的实时容积和形貌特征, 计算了器件的输出电压, 和动物在体实验结果对比吻合良好.…”

Section: 心动能量收集理论进展unclassified

Advances in energy harvesting from heartbeat using flexible smart devices: state-of-the-art review

2019

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心脏跳动能量属于机械能的一种, 而机械能收集原理主要为磁电 [23] 、静电 [24] 、摩擦电 [25,26] , 以及压电效应 [27] . 传统心脏跳动能量收集器件也主要基于这 4 个能量转化原理. 2.1 体外实验由于在体动物心动实验需要医学人员参与, 同时传统器件的刚度较大不易进行在体实验, 因此不少科研人员将实测心脏跳动加速度作为激励计算器件的响应和功率输出 [28∼30] . Deterre 等 [28] 尝试从理论角度设计体积更小的能量收集器件, 分析结果认为在振动位移幅值为毫米级别、器件质量为 1 g、体积为 0.5 cm 3 时输出功率可达到 30 µW. 右心室跳动加速度的实际测试和频谱结果如图 1 所示, 可以看出频谱中 20∼25 Hz 附近的加速度成分接近能量收集器件的共振频率, 可以用来进行能量收集. 这个理论结果对于共振类型的惯性能量收集器件 (如压电梁) 有重要指导意义.

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Section: 心动能量收集理论进展unclassified

Advances in energy harvesting from heartbeat using flexible smart devices: state-of-the-art review

2019

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“…  --v 5 m s 5 m s 1 1 and is implemented within the system model as a look-up table where the friction force can be read as required by the magnet motion.…”

Section: Friction Modelmentioning

confidence: 99%

“…Possible energy sources on the human body include light, heat and motion. Human motion based energy harvesting devices are mostly based on piezoelectricity [1][2][3][4] or electromagnetic induction [5][6][7][8][9][10]. In the case of electromagnetic induction the relative motion between magnets and coils is used to generate a voltage within the coils.…”

Section: Introductionmentioning

confidence: 99%

Human motion energy harvesting: numerical analysis of electromagnetic swing-excited structures

Ylli

Hoffmann

Willmann

et al. 2016

Smart Mater. Struct.

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Energy harvesting from human motion has constantly attracted scientific interest over recent years. A location where a harvesting device can easily and unobtrusively be integrated is the shoe sole, which also protects the device from exterior influences. In this work a numerical system model is developed, which can be used to simulate different inductive harvester geometries and predict their power output. Real world acceleration data is used as a model input. The model is implemented in Matlab/Simulink and subdivided into a mechanical and an electromagnetic model. The key features including the motion model and the calculation of the electromagnetic coupling coefficient are explained in detail and the model is briefly evaluated experimentally. A total of six inductive architectures, i.e. different cylindrical and rectangular magnet-coil arrangements, are then investigated in detail. The geometrical parameters are optimized for each architecture to find the best geometry within the size of 71 mm × 37.5 mm × 12.5 mm, which can be integrated into the sole. With the best overall design an average power output of 42.7 mW is simulated across an ohmic load of 41 Ohms. In addition to the respective best designs, the (dis-)advantages of each architecture are explained.

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“…To realize a portable platform of wearable electronics, developing self‐power flexible sensors have become a trend . Currently, self‐powered technologies based on piezoelectric materials and triboelectric nanogenerator are two typical strategies to convert mechanical energy into electricity. Compared to piezoelectric nanogenerator, triboelectric nanogenerator is more suitable for energy harvesting, as it typically can provide much higher output voltage and current .…”

Section: Introductionmentioning

confidence: 99%

Thin, Skin‐Integrated, Stretchable Triboelectric Nanogenerators for Tactile Sensing

Liu

Wang

Zhao

et al. 2019

Adv Elect Materials

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a trend. [22-27] Currently, self-powered technologies based on piezoelectric materials [28-32] and triboelectric nanogenerator [33-37] are two typical strategies to convert mechanical energy into electricity. Compared to piezoelectric nanogenerator, triboelectric nanogenerator is more suitable for energy harvesting, as it typically can provide much higher output voltage and current. [38-40] However, reports of using triboelectric nanogenerator for flexible sensors are still much less than those of piezoelectric based ones. [41] The typical method of using triboelectric nanogenerator for stress sensing involves difference of electrical signal output with different contact areas. [35,42,43] Therefore, human motion caused contact separations in the wearable triboelectric nanogenerator can result in electricity output and thus tactile sensing. [35] To better meet Recent advances in thin, soft skin-integrated electronics have brought many opportunities in the wearable technics. A simple platform with the functionality of self-powering for epidermal electronics is reported. These electronics can generate electricity from external mechanical stresses that associates with triboelectric effect, and therefore afford excellent performance in tactile sensing and energy harvesting. Combined advances in materials and mechanics of the skin-integrated electronics with high efficiency energy harvesting techniques, triboelectric nanogenerators (TENGs) in an epidermal format is realized for the first time. The dots-distributed electrode pattern allows these electronics exhibiting excellent flexibility and stretchability, distinguishing a broad range of pressures that are relevant to normal body motions. The electricity output of the epidermal device from simple finger tapping modes can achieve >60 V of voltage and >1 µA of current, which is sufficient to light up 15 small light-emitting diodes. Furthermore, the authors also report a 4 × 4 sensor array based on these TENGs, and demonstrate a skin-like electronics for real-time motion monitoring and tactile mapping.

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Mechanics of flexible and stretchable piezoelectrics for energy harvesting

Cited by 17 publications

References 78 publications

Advances in energy harvesting from heartbeat using flexible smart devices: state-of-the-art review

Advances in energy harvesting from heartbeat using flexible smart devices: state-of-the-art review

Human motion energy harvesting: numerical analysis of electromagnetic swing-excited structures

Thin, Skin‐Integrated, Stretchable Triboelectric Nanogenerators for Tactile Sensing

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