Output Characteristic Analysis of Multi-directional Vibration Energy Harvester
Output characteristics of a piezoelectric vibration energy harvester are studied to realize the collection of vibration energy in multiple directions and broad frequency ranges.Firstly,the differential equation of the one-dimensional model of a piezoelectric cantilever beam is established,and the responses of the cantilever beam subjected to external excitation are obtained and analyzed.Then,a finite element model of the vibration energy harvester consisting of multiple piezoelectric cantilever beams is established by means of COMSOL,and the modals,output voltage and output power of the harvester are obtained and analyzed.The results show that the harvester can generate high voltage and power under the excitation in any different directions.Furthermore,the broadband output characteristics of the harvester under the excitation in different directions are discussed.The results show that there are multiple resonant peaks with similar amplitudes in the frequency range of 200-400 Hz..
vibration and wavevibration energy harvesterexcitations in multi-directionalmodal analysisoutput characteristic analysisbroadband characteristics
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