复合型悬臂梁压电振子振动模型和发电试验研究.pdfVIP

第 46 卷第 9 期 机 械 工 程 学 报 Vol.46 No.9 2010 年 5 月 JOURNAL OF MECHANICAL ENGINEERING May 2010 DOI ：10.3901/JME.2010.09.087 复合型悬臂梁压电振子振动模型及发电试验研究* 袁江波 谢 涛 单小彪 陈维山 (哈尔滨工业大学机电工程学院 哈尔滨 150001) 摘要：单悬臂梁压电振子俘获环境中振动能时，对环境振动频率敏感且频带有限，在谐振频率与环境振动频率不匹配的情况 下，会导致压电振子俘能效率低下。基于此，设计复合型悬臂梁压电振子并建立其振动模型，采用激光测振仪对复合型悬臂 梁压电振子进行扫频测试。研究结果表明，复合型悬臂梁压电振子谐振频率范围为 56～72 Hz，与理论分析结果基本吻合， 试验验证了理论模型的正确性。相比于单悬臂梁压电振子，复合型悬臂梁压电振子有效地拓宽了其谐振频带，易于实现与环 境振动源振动频率匹配以提高压电发电效率。在此基础上，进行复合型悬臂梁压电发电装置的发电能力测试，在负载为 820 Ω，工作频率为 60 Hz 时最大输出功率达到4.9 mW ，产生的能量能够满足网络传感器等低耗能微电子产品的供能需求。 关键词：压电发电 复合型压电振子 振动模型 频带 中图分类号：TM619 Vibrated Model and Experiments of Multiple Piezoelectric Cantilevers in Energy Harvesting YUAN Jiangbo XIE Tao SHAN Xiaobiao CHEN Weishan (School of Mechatronics and Electrical Engineering, Harbin Institute of Technology, Harbin 150001) Abstract ：A single piezoelectric cantilever is sensitive to the vibration frequency for scavenging ambient energy. The efficiency of the piezoelectric cantilever is very low when the resonance frequency does not match the environmental vibration frequency. In order to increase the frequency band of the piezoelectric cantilever, multiple piezoelectric cantilevers (MPECS) are designed. A vibration model is presented to determine the resonance frequency of MPECS. It can be found that the results obtained from the theoretical model are basically in agreement with the experimental results. Comparing with a piezoelectric cantilever, the MPECS can effectively increase the band of resonance frequency. The generating capacity of MPECS power generation unit is tested. The maximum output power can reach 4.9 mW at a load of 820 Ω and a working frequency of 60 Hz. The generated