Simulation and test verification of piezoelectric cantilever vibration energy harvester
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摘要:
基于压电陶瓷的振动能量收集器以其结构简单、清洁环保及易于微型化等诸多优点受到广泛关注。利用压电陶瓷的正压电效应，根据机电理论和结构动力学理论，采用模态法建立了压电悬臂梁的双向耦合分布参数模型，仿真分析了外激励频率和外接负载对压电能量收集器输出电压特性的影响，设计制作了铝制悬臂梁，并进行了地面振动和能量收集试验，试验结果与理论仿真吻合较好，验证了理论建模的正确性。试验结果表明，单个压电片的能量收集电压最大为73 V/N。
Abstract:Piezoelectric ceramic vibration energy harvester has attracted great attention for its simple structure, environment protection, easy miniaturization and other advantages. According to piezoelectric effect, a double-coupled distributed parameter model was established using mode method by combination of electromechanical theory and structural dynamics theory. Simulation analysis of effect of excitation frequency and load on output voltage of piezoelectric energy harvester was performed. Al-cantilever energy harvester was made to perform ground vibration and energy harvesting test. The experimental results are in good agreement with the numerical simulation, which verifies the correctness of theoretical modeling. Experimental results show that the max voltage output of a single piezoelectric patch is 73 V/N.
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Key words:
- piezoelectric effect /
- energy harvester /
- double-coupled /
- ground test /
- piezoelectric ceramic
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图 3 给定外接负载下的输出电压-外激励频率曲线
Figure 3. Output voltage versus excitation frequency curve with given load
图 4 给定外激励频率下的输出电压-外接负载曲线
Figure 4. Output voltage versus load curve withgiven excitation frequency
图 9 给定外接负载下的输出电压-外激励频率曲线(试验)
Figure 9. Output voltage versus excitation frequency curve with given load (test)
图 10 给定外激励频率下的输出电压-外接负载曲线(试验)
Figure 10. Output voltage versus load curve withgiven excitation frequency (test)
图 11 给定外接负载下输出电压-外激励频率仿真试验结果对比
Figure 11. Simulation and test comparison of output voltage versus excitation frequency curve with given load
图 12 给定外激励频率下输出电压-外接负载仿真试验结果对比
Figure 12. Simulation and test comparison of output voltage versus load curve with given excitation frequency
表 1 压电悬臂梁和压电片的几何参数及材料性能参数
Table 1. Geometry and material performance parameters of piezoelectric cantilever and piezoelectric patch
参数 数值 铝制悬臂梁 压电片(PZT-5) 长/mm 533 60 宽/mm 30 30 高/mm 5 0.5 弹性模量/GPa 72 61 泊松比 0.3 0.35 密度/(kg·m-3) 2 700 7 500 压电常数e31*/ (C·m-2) -11.27 电容/nF 139 
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