| 唐礼平,胡庆南,韩婷婷.混合式三稳态压电能量俘获器动力性能分析[J].安徽建筑大学学报,2024,32(1):68-74 |
| 混合式三稳态压电能量俘获器动力性能分析 |
| Dynamic Performance Analysis of Hybrid Tri-stable Piezoelectric Energy Harvester |
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| DOI： |
| 中文关键词: 压电能量俘获器 力电耦合 弹性放大器 谐波平衡法 阱间运动 |
| 英文关键词: piezoelectric energy harvester electro-mechanical coupling elastic amplifier harmonic balance method inter-well motion |
| 基金项目:安徽省自然科学基金项目（2108085MA28）；安徽建筑大学安徽省BIM工程中心主任基金项目（AHBIM2020001ZR）；安徽省高校省级自然科学研究项目（KJ2021JD01） |
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| 中文摘要: |
| 针对传统暴力行为识别算法精度不高和三维卷积神经网络参数多的问题，本文提出一种基于 3DSE-Densenet 网络的视频暴力行为识别改进算法。采用 3D Densenet 模型提取视频中的时空特征信息，SENet（Squeeze-and-Excitation Networks）按照时空特征的重要性程度进行加权处理，根据加权的时空特征识别视频中的暴力行为。实验结果表明，本文提出的 3D SE-Densenet 方法在 Hockey Fights Dataset 和 Movies Dataset 上识别准确率分别达到 99.1% 和 100%，可较准确地识别暴力行为，准确率高于传统方法。 |
| 英文摘要: |
| To improve the energy harvesting performance of the piezoelectric energy harvester under low external excitation level, based on the multi-stable piezoelectric cantilever energy harvester model, two elastic amplifiers were respectively installed, one was installed between the U-shaped frame and the substrate, and the other was installed between the U-shaped frame and the fixed end of the cantilever beam. Hence, a hybrid tri-stable piezoelectric energy harvester (TPEH+DEM) model was proposed. The nonlinear electro mechanical coupling equation of the TPEH+DEM system was established by using Hamilton principle. The influences of the mass ratio and spring stiffness ratio of the two elastic amplifiers, the relative distance between the magnets, and the load resistance on the energy harvesting level of the TPEH+DEM system were analyzed. And it turned out that within a certain range of external excitation frequency, the response output power of the TPEH+DEM system had two peak value. Reasonable adjustment of the mass ratio and spring stiffness ratio of the two elastic amplifier can make the system enter inter-well motion under low external excitation intensity, and produce high output power. Compared with the traditional multi-stable piezoelectric energy harvester with only an elastic substrate, the TPEH+DEM model has better energy harvesting performance under low frequency external excitation level. |
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