A piezoelectric energy harvester used in hydraulic liquid absorber was presented. To enhance the energy-generating capability and obtain the optimal structural/material parameters, the analysis model of clamped PZT disk generator under concentrated force was established utilizing the theory of plates and shells. The influences of radius ratio (λ) , thickness ratio (β) as well as material Young's modulus ratio ( ζ) of the PZT disk on energy generation were investigated. The results show that there is an optimal pair of X and β for a PZT disk generator with given ζ to obtain maximal electrical energy. Similarly, in the case of given X and β, there is an optimal ζ, which decreases with the decrease of β and is not influenced by the change of X under given β. At the same time, reducing ζ is helpful for the generator to generate more electrical energy. When aluminum or beryllium bronze plates are used as substrates, the optimal radius ratio and thickness ratio are (0.45, 0.45) or (0.585, 0.6), respectively. The maximal electric energy generated are 1.14643 x 10 -4J and 1.01893 x 10-4J, respectively.%提出一种用于液压流体吸振器的压电发电装置.为提高所用圆形压电振子的发电能力,获得最优的结构及材料性能参数,利用板壳理论建立了固支边界条件下的位移曲线及发电量的理论分析模型,研究了半径比(陶瓷/基板)、厚度比(陶瓷/总厚度)及弹性模量比(基板/陶瓷)等对其发电能力的影响规律.研究表明,在压电振子材料确定时,存在最佳的半径比和厚度比使其发电能力最大；在压电振子结构尺寸确定时,存在最佳的弹性模量比使发电量最大,且厚度比确定时的最佳弹性模量比与半径比无关、半径比确定时的最佳弹性模量比随厚度比的减小而降低；减小弹性模量比有助于提高压电振子的发电能力.铝基板及铍青铜基板压电振子的最佳半径比/厚度比分别为0.45/0.45和0.585/0.60,最大发电量分别为1.146 43×10-4J和1.018 93 ×10-4J.
展开▼
