Simulation And Experimental Study On An Underwater Piezoelectric Energy Harvester Array Based On Fluid-Induced Vibration

In recent years,the study on piezoelectric energy harvesting has attracted more and more attention from scholars at home and abroad.This technology is mainly aimed at MEMS and renewable energy.This paper mainly introduces simulation and experimental study on underwater piezoelectric energy harvester array based on fluid-induced vibration,which is mainly oriented to low-speed water in the natural environment.Firstly,this paper introduces a mathematical modeling method based on swing for single-vibrator energy harvester,which mainly uses the idea of engineering system modeling and simulation,and combines the expertise of materials mechanics,piezo-electricity,fluid mechanics and other disciplines to establish a mathematical model of fluid-solid-electric multi-physics coupling.And the correctness of the mathematical model is verified by comparison between the numerical simulation and the experimental data.Then,based on the mathematical model of single-vibrator energy harvester,the fluid simulation study of piezoelectric energy harvester array was carried out,which mainly included double-vibrators parallel array,double-vibrators tandem array,three-vibrators parallel array,three-vibrators tandem array,and ninevibrators square array.Through the processing and analysis of simulation data,the general rule of the piezoelectric energy harvesting characteristics of the piezoelectric energy harvester array was obtained.That is,the single-row parallel array can improve the system's starting velocity and half of bandwidth due to the interference of the field between adjacent vibrators,but the maximum energy harvesting power value is negatively affected;the single-column tandem array can effectively improve the maximum energy harvesting power value of the system due to the additional excitation of the wake coupling,but it performs poorly on the starting velocity and half of bandwidth;the nine-vibrators square array combines the advantages of the above two arrays,and it can improve the energy harvesting performance,the maximum energy harvesting power,the starting velocity and the half of bandwidth,so it has the best overall performance.In addition,the improvement of energy harvesting efficiency of single-row parallel arrays and single-column tandem arrays depends on the comprehensive effect of the array on the maximum power value and half of bandwidth.Finally,the experimental research on different types of energy harvester array was carried out.The comparison of the piezoelectric energy harvesting characteristics among different arrays in the experiment and the comparison of the piezoelectric energy harvesting characteristics between the experimental group and the simulation group verified the general conclusion obtained in the fluid simulation.The research in this paper provides theoretical and experimental guidance for the study of piezoelectric energy harvester array,and provides a substantial and important reference for improving the energy harvesting characteristics of piezoelectric energy harvester array.