The Character Of Flow-induced Vibration And Energy Harvesting Ability Of Flexible Peizoelectric Material

The movement of flow exists everywhere in nature. As a result, one of significanceresearches is how to convert the flow kinetic energy such as wind, rivers and oceanic ortidal currents into electricity. Piezoelectric materials are able to generate electric frominduced mechanical deformation, which can be used to build device to generate power.Because the technology of the flow-induced vibration and energy harvesting usingpiezoelectric materials relates to the knowledge of fluid, solid and electric at the sametime, a numerical method with coupling liquid-solid and piezoelectricity is presented.Besides, the vibration and energy harvesting ability of the flexible piezoelectric beamimmersed in uniform flow are studied.First, according to the theory of Computational Fluid Dynastic (CFD), LatticeBoltzmann Method (LBM), Immersed Boundary Method (IBM), the theory of vibrationand piezoelectric, Bernoulli-Euler beam theory etc, a two dimensional (2D) numericalmethod with coupling liquid-solid and piezoelectricity is developed. Furthermore, thenumerical method is validated by the example of state flow cylinder, vibration andenergy harvesting of single piezoelectric beam after comparing the analysis andcomputing results with the results of previous papers.The optimal resistances connected to the piezoelectric beam are analyzed atdifferent dimensions and velocities of flow by using the above numerical couplingmethod. The dynamic response and the ability of energy harvesting of the flexiblepiezoelectric beam are also analyzed at different length and thickness of piezoelectricbeam or velocities of flow.Toward high modes of piezoelectric beam and improving efficient of the energyharvesting, the method of electrodes configuration of the continuous electrode and thesegmented electrodes on the flexible piezoelectric beam in length direction is presentedin this paper to meet the high modes in vary fluid distribution. The number and locationof stress on the beam are investigated and the output electric power of the segmentedelectrodes and the continuous electrode is compared at different length and thickness ofpiezoelectric beam or velocities of flow. And the result shows that reasonablysegmented electrodes configuration can effectively raise the electricity–generatingcapacity of the piezoelectric beam in uniform flow compared with the continuouselectrode.In order to investigate the coupling condition of multi-piezoelectric beams, thevibration and energy harvesting ability of two piezoelectric beams are analyzed atdifferent arrangement modes, which include series pattern, parallel pattern andstaggered pattern. The results show that the coupling state, vibration state and energy harvesting ability of the piezoelectric beam are different at different arrangement modes.Besides, stable vibration and optimal power output can be obtained by arrangingreasonable arrangement modes.The obtained mathematical model of coupling fluid, solid and electric and theanalysis of energy ability of piezoelectric beam in this paper are the innovative progressof the development of flow-induced vibration and energy harvesting technology usingpiezoelectric materials and are the theoretical basic of investigating energy harvester ofpiezoelectric.