A new electrical power generation device based on high-frequency dynamic piezoelectric shear deformation under friction is developed. During the operation of a moving plate compressed and sliding on the top of a piezoelectric patch with constant velocity, dynamic shear deformation of the elastic piezoelectric patch is excited by periodic friction force and status (sliding and stick) variation. The dynamic piezoelectric shear strain can then generate continuous electrical power for energy absorbing and harvesting applications. The design of the piezoelectric couple device is first provided, and its mechanism, dynamic response and electric power generation under friction are described by a detailed iteration model. By comparing with previous experimental results, the accuracy of the proposed model is proven. Through numerical studies, the influences of the equivalent mass of the system, the velocity of the sliding object, the static friction coefficient and its lower limit, as well as the friction force delay rate on the power generation are obtained and discussed. The numerical results show that with the proposed design, up to 50-Watt maximum electrical power could be generated by a piezoelectric patch with a dimension of \(20\times 2\times 6\) cm under continuous friction with the moving plate at the velocity of 15 m/s. The possible bi-linear elastic stiffness variation of the system is also introduced, and the threshold of bi-linear elastic deformation, where the system stiffness changes, can be optimized for obtaining the highest power generation.

研制了一种基于摩擦作用下的高频动态压电剪切变形的新型发电装置。在压电贴片顶部受压并以恒定速度滑动的运动板工作过程中，弹性压电贴片的动态剪切变形受到周期性摩擦力和状态（滑动和粘着）变化的激发。然后动态压电剪切应变可以产生连续的电能用于能量吸收和收集应用。首先给出了压电耦合装置的设计，并通过详细的迭代模型描述了其机理、动态响应和摩擦下的发电量。通过与以往实验结果的比较，证明了所提模型的准确性。通过数值研究，得到并讨论了系统等效质量、滑动物体速度、静摩擦系数及其下限、摩擦力延迟率等对发电量的影响。数值结果表明，采用所提出的设计，尺寸为\(20\times 2\times 6\) cm 以 15 m/s 的速度与移动板连续摩擦。还介绍了系统可能的双线弹性刚度变化，并优化了系统刚度变化的双线弹性变形阈值以获得最高发电量。