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Effects of geometric and material properties on electrical power harvested from a bimorph piezoelectric cantilever beam

机译:几何和材料特性对双压电晶片压电悬臂梁收集的电功率的影响

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Purpose - A three-dimensional finite element (FE) model is developed to design a vibrating bimorph piezoelectric cantilever beam with lead zirconate titanate (PZT-5H) for energy harvesting. The paper aims to discuss these issues. Design/methodology/approach - A parametric study of electric power generated as a function of the dielectric constant, transverse piezoelectric strain constant, length and thickness of the piezoelectric material, is conducted for a time-harmonic surface pressure load. Transversely isotropic elastic and piezoelectric properties are assigned to the bimorph layers with brass chosen as the substrate material in the three-dimensional FE model. Using design of experiments, a study was conducted to determine the sensitivity of power with respect to the geometric and material variables. Findings - The numerical analysis shows that a uniform decrease in thickness and length coverage of the piezoelectric layers results in a nonlinear reduction in power amplitude, which suggests optimal values. The piezoelectric strain coefficient, d31 and the thickness of PZT-5H, tp, are the most important design parameters to generate high electric energy for bimorph vibration harvesting device. Originality/value - The work demonstrates that, through a sensitivity analysis, the electro-mechanical piezoelectric coupling coefficient (d31) and the thickness of the piezoelectric strips (tp) are the most important parameters which have a significant effect on power harvested.
机译:目的-建立了三维有限元(FE)模型,以设计带有锆钛酸铅(PZT-5H)的振动双压电晶片压电悬臂梁,以进行能量收集。本文旨在讨论这些问题。设计/方法/方法-针对时谐表面压力载荷,对作为介电常数,横向压电应变常数,压电材料的长度和厚度的函数所产生的电力进行了参数研究。在三维有限元模型中,以黄铜为基底材料,将横向各向同性的弹性和压电特性分配给双压电晶片层。使用实验设计,进行了一项研究以确定相对于几何和材料变量的功率敏感性。发现-数值分析表明,压电层厚度和长度覆盖率的均匀减小会导致功率幅度的非线性减小,这表明了最佳值。压电应变系数d31和PZT-5H的厚度tp是为双压电晶片振动采集装置产生高电能的最重要的设计参数。原创性/价值-这项工作表明,通过灵敏度分析,机电压电耦合系数(d31)和压电条的厚度(tp)是最重要的参数,它们对收集的功率有重大影响。

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