Astashev Vladimir K, Pichugin Kirill A, Li Xuan, Meadows Alan, Babitsky Vladimir I
IEEE Trans Ultrason Ferroelectr Freq Control. 2020 Sep;67(9):1888-1896. doi: 10.1109/TUFFC.2020.2991836. Epub 2020 May 1.
This article provides a fundamental study into the trade-offs between the location of piezoceramic elements, resonant frequency, and achievable ultrasonic vibration amplitude at the working end of the bolted Langevin-style transducers (BLTs) for ultrasonically assisted machining (UAM) applications. Analytical models and finite-element (FE) models are established for theoretical study, which are then validated by experiments on four real electromechanical transducers. The results suggest that resonant frequency and oscillation amplitude of the BLTs depend essentially on the dimensions of the system and the location of the piezoceramic elements. The highest resonant frequency and the maximal vibration are achieved when the piezoceramic elements are at the longitudinal displacement node, where the highest effective electromechanical coupling coefficient value is exhibited. However, the minimal resonant frequency and the lowest vibration, which is almost equal to zero, are observed when the piezoceramic elements are located at the displacement antinode. In addition, the longitudinal displacement node locations are dependent on the resonant frequency of the devices rather than the locations of the piezoceramic elements.
本文对用于超声辅助加工（UAM）应用的螺栓式兰姆波换能器（BLT）工作端的压电陶瓷元件位置、共振频率和可实现的超声振动幅度之间的权衡进行了基础研究。建立了分析模型和有限元（FE）模型用于理论研究，然后通过对四个实际机电换能器的实验进行验证。结果表明，BLT的共振频率和振荡幅度主要取决于系统尺寸和压电陶瓷元件的位置。当压电陶瓷元件位于纵向位移节点处时，可实现最高的共振频率和最大振动，此时展现出最高的有效机电耦合系数值。然而，当压电陶瓷元件位于位移波腹处时，观察到最低的共振频率和几乎为零的最低振动。此外，纵向位移节点位置取决于器件的共振频率，而非压电陶瓷元件的位置。
