Research On Structural Parameter Optimization Of Variable Section Piezoelectric Energy Harvester

With the rapid development of micro-electromechanical control systems(MEMS),wireless sensor networks(WSN)and micro-power electronics,piezoelectric energy harvesters based on vibration energy harvesting technology have become a hot issue in the field of self-powered technology.In order to enable the wireless sensor node to work stably for a long period of time,how to achieve stable power supply for a long time becomes an urgent problem to be solved.Therefore,the development of new wireless self-powered technology has become a research hotspot.In order to further reduce the natural frequency of the piezoelectric energy harvester and improve the output performance of the piezoelectric energy harvester to achieve the vibration energy supply in the low frequency environment,a variablesection circular low-frequency piezoelectric vibration energy harvester structure was proposed..Firstly,based on the theoretical analysis and the model parameters of the cantilever beam piezoelectric energy harvester,the main influencing factors of the working environment and output performance of the piezoelectric energy harvester were analyzed.The orthogonal test method optimized the structural parameters,including: the natural frequency of the structure was small,the output voltage was large,and the size parameters of the variable-section circular piezoelectric energy harvester were optimized,and the characteristics were analyzed.Secondly,according to the size parameters of the variable-section piezoelectric energy harvester,the variable-section energy collector test piece was fabricated,and the experimental platform test system was built to test the output voltage and output power of the variable-section circular piezoelectric energy harvester.It showed that the parallel rectified output power of the four array structures could reach 0.213 mW,which could meet the requirements of power for micro power devices.Finally,the power supply system of wireless pressure sensing was built by this energy harvester,which verified that the variable-section piezoelectric energy harvester can realized wireless sensing power supply instead of chemical battery;thus the results was proved that the variable cross-section circular piezoelectric energy collection proposed in this paper was capable of low frequency piezoelectric energy harvesting.Figure [54] Table [9] Reference [67]...