Abstract
In order to reduce the natural frequency of the piezoelectric vibration energy harvester, improve performance of the piezoelectric vibration energy harvester, and meet the requirements of energy acquisition in the low-frequency vibration environment, a variable-section circular piezoelectric vibration energy harvester is presented. The dynamic model and electromechanical coupling model of variable-section circular piezoelectric vibration energy harvester are established. The main factors affecting the output performance of piezoelectric vibration energy harvester are analyzed. The structure parameters of piezoelectric vibration energy harvester are optimized by orthogonal experiment. An experimental platform is built to test output voltage and output power of piezoelectric vibration energy harvester. The experimental results show that when the number of energy harvester is 4 and the external load is 180KΩ, the parallel output power can reach 0.213mW, which can meet the requirements of micro-power device power supply.
Highlights
Piezoelectric vibration energy harvester has the advantages of simple structure, easy miniaturization and low heat generation, which makes it a research hotspot
According to the analysis results, the variable-section circular piezoelectric cantilever beam is selected as harvesting structure of energy harvesting device
The structure parameters of piezoelectric vibration energy harvester are optimized by orthogonal experiment
Summary
The related self-powered technology has been promoted greatly with continuous development of micro-power electronic device.[1,2,3] Chemical battery is a traditional power supply method, but chemical battery has the disadvantages of large volume, limited service life, and difficult to replace under special circumstances, which limits the application of chemical batteries.[4,5] Capturing energy in the environment to power micro-power electronic device becomes an effective solution.[6,7,8,9] Vibration energy has received extensive attention due to its abundant stock and high energy density.[10,11,12,13,14] According to the different conversion mechanisms, the vibration-electric energy harvester are generally divided into three types, namely piezoelectric type, electrostatic type and electromagnetic type.[15,16,17,18,19] piezoelectric vibration energy harvester has the advantages of simple structure, easy miniaturization and low heat generation, which makes it a research hotspot. The 16 experiments shown in the orthogonal table can comprehensively reflect the influence of various levels in various factors on natural frequency and open-circuit output voltage of the variable-section circular piezoelectric energy harvester. It can be seen that natural frequency of the variable-section circular piezoelectric energy harvesters with different size parameters are determined together by different factors (length A, width B, and thickness C). The primary and secondary order of influence of each factor on open-circuit output voltage of the variable-section circular piezoelectric cantilever beam is C > B > A.
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