Research On Flexible Piezoelectric Power Generation Device Under Wave Action

In recent years,with the increasingly serious pollution of the marine environment,the monitoring of the marine environment has been paid more and more attention.In the past,most of the environmental monitoring devices used the traditional chemical fuel power supply,but because the monitored environment is mostly bad and changeable,the traditional power supply is easy to be corroded and destroyed;moreover,the energy of the traditional power supply is limited,and the monitoring equipment laid in large area needs to change the power supply regularly,so the workload is very huge.Therefore,it is necessary to find a new power supply for the marine environmental monitoring device.There is a huge amount of energy in the ocean.At present,wave energy,as a better energy in the ocean,has gradually entered the attention of researchers.In this paper,a kind of flexible piezoelectric energy harvester using wave energy is designed.By converting wave energy into electric energy,it can continuously supply power for the marine environment monitoring device.It can not only provide an effective way to solve the problems of short life and difficult replacement of the traditional power supply of the monitoring device,but also combine wave energy,vibration energy and piezoelectric power generation technology,and provide some references for researchers in energy development and utilization.This paper first introduces the research background and the research status of piezoelectric energy harvester at home and abroad,focusing on the current situation of the piezoelectric energy harvester under the action of wave excitation.This paper summarizes the shortcomings of the current research at home and abroad and the main research content of this paper,and makes in-depth analysis of the flexible piezoelectric power generation theory under the action of wave,so as to provide theoretical support for the next research.Secondly,the numerical wave flume model is established according to the size of the experimental flume.Through the analysis of the displacement time history curve of the reference point of the horizontal plane and the wave form of the numerical flume,the reliability of the numerical wave flume is confirmed,which provides a guarantee for the subsequent coupling analysis of the wave field.Then,based on the established numerical wave flume,the two-way coupling calculation of wave and flexible plate is carried out.The high-quality coupling effect of flexible plate and wave proves that the two-way fluid structure coupling calculation of wave and high flexible material under the ANSYS Workbench is feasible,which provides a basis for the two-way coupling analysis of flexible piezoelectric energy harvester and waves.Furthermore,the relationship between the thickness and length of the flexible plate,wave frequency,wave velocity and the deformation of the free end of the flexible plate is found.Finally,the flexible plate is replaced by the flexible piezoelectric energy harvester,and the three fields of fluid solid electricity coupling calculation are carried out.It is found that the output voltage of the piezoelectric energy harvester is stable,and the distance between the piezoelectric energy harvester arranged in series,different types of piezoelectric energy harvester(unimorph,bimorph series,bimorph parallel),length of piezoelectric energy harvester and other factors will affect the output voltage of the piezoelectric energy harvester,and the optimal arrangement of two piezoelectric energy harvester in series is obtained.After that,an experimental platform is built to verify the simulation results,which provides experimental basis for the design of piezoelectric energy harvester.