Liu Yingxiang, Shen Qiangqiang, Shi Shengjun, Deng Jie, Chen Weishan, Wang Liang
State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, China.
Sensors (Basel). 2017 Jun 27;17(7):1510. doi: 10.3390/s17071510.
A novel exciting method for a sandwich type piezoelectric transducer operating in longitudinal-bending hybrid vibration modes is proposed and discussed, in which the piezoelectric elements for the excitations of the longitudinal and bending vibrations share the same axial location, but correspond to different partitions. Whole-piece type piezoelectric plates with three separated partitions are used, in which the center partitions generate the first longitudinal vibration, while the upper and lower partitions produce the second bending vibration. Detailed comparisons between the proposed exciting method and the traditional one were accomplished by finite element method (FEM) calculations, which were further verified by experiments. Compared with the traditional exciting method using independent longitudinal ceramics and bending ceramics, the proposed method achieves higher electromechanical coupling factors and larger vibration amplitudes, especially for the bending vibration mode. This novel exciting method for longitudinal-bending hybrid vibrations has not changed the structural dimensions of the sandwich transducer, but markedly improves the mechanical output ability, which makes it very helpful and meaningful in designing new piezoelectric actuators operated in longitudinal-bending hybrid vibration modes.
提出并讨论了一种用于三明治型压电换能器在纵向-弯曲混合振动模式下工作的新型激励方法，其中用于激发纵向和弯曲振动的压电元件具有相同的轴向位置，但对应于不同的分区。使用具有三个分离分区的整体式压电板，其中中心分区产生第一纵向振动，而上、下分区产生第二弯曲振动。通过有限元法（FEM）计算完成了所提出的激励方法与传统方法之间的详细比较，并通过实验进一步验证。与使用独立纵向陶瓷和弯曲陶瓷的传统激励方法相比，所提出的方法实现了更高的机电耦合系数和更大的振动幅度，特别是对于弯曲振动模式。这种用于纵向-弯曲混合振动的新型激励方法没有改变三明治换能器的结构尺寸，但显著提高了机械输出能力，这使得它在设计以纵向-弯曲混合振动模式工作的新型压电致动器方面非常有帮助且有意义。
