Abstract
In order to solve the problem of continuous and stable power supply for vehicle sensors, a resonant cavity piezoelectric energy harvester driven by driving wind pressure was designed. The harvester has an effective working range of wind speed. According to the energy conservation law, the cut-in (initial) wind speed of the harvester was solved. The pressure distribution law of the elastic beam in the flow field was studied by the Fluent software package, and the results were loaded into a finite element model with a method of partition loading. The relationship between the wind speed and the maximum principal stress of the piezoelectric cantilever beam was analyzed, and the critical stress method was used to study the cut-out wind speed of the energy harvester. The results show that the cut-in wind speed of the piezoelectric energy harvester is 5.29 m/s, and the cut-out wind speed is 24 m/s. Finally, an experiment on the power generation performance of the energy harvester was carried out. The experimental results show that the cut-in and cut-out wind speeds of the piezoelectric energy harvester are 5 m/s and 24 m/s, respectively, and the best matching load is 60 kΩ. The average output power, generated by the harvester when the driving wind speed is 22 m/s, is 0.145 mW, and the corresponding power density is 1.2 mW/cm3.
Highlights
In order to solve the environmental problems caused by automobile exhaust, some automobile companies cooperate with the government to implement the new energy “shared car” services in urban areas, with a maximum speed of no more than 70 km/h
This makes piezoelectric energy harvesting a promising approach to energy recovery
When the wind speed is 7.5–12.5 m/s, the wind pressure-capture device can obtain an output power of 0.1 mW to 0.8 mW. They found that the resonant cavity-based piezoelectric energy harvester does not require any external vibration sources, eliminating the bandwidth problems associated with vibratory energy harvesters
Summary
In order to solve the environmental problems caused by automobile exhaust, some automobile companies cooperate with the government to implement the new energy “shared car” services in urban areas, with a maximum speed of no more than 70 km/h. When the wind speed is 7.5–12.5 m/s, the wind pressure-capture device can obtain an output power of 0.1 mW to 0.8 mW They found that the resonant cavity-based piezoelectric energy harvester does not require any external vibration sources, eliminating the bandwidth problems associated with vibratory energy harvesters. In order to achieve the purpose of continuous and stable power supply for the vehicle-mounted sensor on the shared car, the traditional resonant cavity piezoelectric energy harvester was improved: A Helmholtz resonant cavity was added to the end of the main cavity, and a spoiler cylinder was added at the entrance of the main cavity. Trhesuusl,ta, trheepeaairtinpgrepssruocreesisnisthfoermmaeidn. cTahveitpyieiszoreeldeuctcreidc ,ctahnetileelvasetricbebaemamisips erreisoedt,icaanlldy tahnedarierpoeuattleedtliys dcelofosermd.eTdhtuosg, eanreerpateeatcihnagrgpersocoefsospipsofsoirtme peodl.aTrihtieespiinezcoyeclleecstroinc tchaentuilpepveerr abnedamlowisepresruiorfdaicceaslloyf athned prieepzeoaetleedcltyricdceeforarmmeicdshtoeegte. nTehreatpeieczhoaerlgeecstroicf coeprpamosiicteshpeoeltasriatnieds lionadcyscfloersmona ctlhoeseudpepneerragnydoulotpwuetr csiurcrufaitceths aotfotuhetppuiteszeoleelcetcrtirciacl ceenrearmgyic, tshheereetb.yTchoenpvieerztoineglewctirnicdcperreasmsuicresheeneetrsgaynidntlooaedlesctfroircmal eancelrogsye.d energy output circuit that outputs electrical energy, thereby converting wind pressure energy into electrical energy
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