摘要
通过建立Cymbal压电发电换能器的机电耦合有限元分析模型，计算分析了换能器结构参数对输出电压和谐振频率的影响以及外接负载对Cymbal换能器输出电压和输出功率的影响。研究表明，为了降低换能器的工作频率和提高换能器的输出电压，应增大换能器的空腔底部直径和减小换能器的空腔高度；在选择金属端冒和压电陶瓷厚度等参数时，应综合考虑换能器系统的刚度和外界振动源的频率特性和加速度特性；在任意一个频率点上，Cymbal换能器均存在一个最佳的外接负载，使得换能器的输出功率最大，而这个最佳的负载阻抗就等于Cymbal换能器在这个工作频率点上的输出阻抗。文中还提出并分析了基于外加预应力的多振子级联方式Cymbal压电发电换能器系统的结构。
Abstract
A finite element analysis model of energy harvesting with Cymbal transducer is established. The influence of structural parameters of the transducer on the output voltage and resonance frequency is calculated and analyzed. The results show that, in order to reduce the operating frequency and increase the output voltage of the transducer, we should increase the bottom diameter of the cavity and reduce the height of the cavity. When choosing the thickness of metal end cap and the thickness of PZT, the stiffness of Cymbal transducer and the characteristics of frequency and acceleration of an external vibration source must take into consideration. A pre-stress, multi-layer structure of Cymbal energy harvesting system are promoted and analyzed. The effect of the external resistance load on the output voltage and the output power of Cymbal transducer is identified. The results shows that, at a specific frequency there always has an optimal external resistance load which makes the transducer generate the maximum output power. The optimal resistance of the load matches with the output impedance of Cymbal transducer at this specific frequency.
关键词
压电发电换能器 /
有限元 /
多振子级联 /
负载阻抗
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Key words
cymbal energy harvesting transducer /
finite element /
multi-layer /
resistance load
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卢义刚 颜振方 .
Cymbal压电发电换能器有限元分析[J]. 振动与冲击, 2013, 32(6): 157-162
LU Yigang YAN Zhenfang.
Finite Element Analysis of Energy Harvesting With Cymbal Transducer[J]. Journal of Vibration and Shock, 2013, 32(6): 157-162
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