Design And Research Of A New Piezoelectric Wind Energy Collector

There are a large number of forests in China.Various environmental indicators of the forest(such as temperature,humidity,rainfall,etc.)need to be monitored in real time by using a wireless sensor network.Then there are so many sensor nodes in the wireless sensor network that it is not easy to replace the battery for these sensors.Forest stroke can be everywhere and the direction of the wind is changing.According to these characteristics of the forest stroke energy,in this paper,a wind speed cup-type piezoelectric wind energy collector is designed to convert the wind energy around the environment into electrical energy and provide a steady flow of power for wireless sensor nodes for monitoring the forest environment.Hopefully this can provide an effective solution to the difficult problem of replacing batteries for sensor nodes in the forest.The author reviews a large number of domestic and foreign literature on wind energy collection,analyzes and summarizes the working principle and advantages and disadvantages of various wind energy collector,and then designs a wind speed cup-type piezoelectric wind energy collecting device.First of all,the mechanism of piezoelectric materials is reviewed,and the composition and fixing method of piezoelectric cantilever beam are summarized.The strain expressions of three kinds of piezoelectric cantilever beams are deduced.The three-dimensional structure model of piezoelectric wind collector is designed and its working principle is introduced.Then,the three shapes of the piezoelectric cantilever were statically analyzed by ANSYS Workbench simulation software.The rationality of the strain expression of the three shapes of piezoelectric cantilever beam is verified.The influence of size parameters and material parameters on the piezoelectric cantilever beam voltage output is studied.In addition,the dynamic characteristics of the piezoelectric cantilever beam are simulated and the theory is provided for selecting the appropriate size of the piezoelectric cantilever beam for the next experimental part.Finally,according to the result of simulation and optimization,the corresponding piezoelectric cantilever was fabricated,and then the experimental prototype of wind cup piezoelectric wind energy collector was designed and assembled.The corresponding experimental platform was set up,and the output characteristics of wind energy collector prototype were studied.The influence of wind speed on the output voltage and output power of the wind energy collecting device was tested.The influence of different external loads on the output voltage and output power of the collecting device was also studied.The experimental results show that the voltage and power output characteristics of the triangular piezoelectric cantilever are better than the rectangular and trapezoidal piezoelectric cantilever beam at the same wind speed.In addition,there are three typesof piezoelectric cantilevers with the best external load so that the output power is maximized.The experimental results are basically consistent with the simulation results.