Wen Zhiyi, He Qing, Qiao Guanyao
Institute of Vibration Engineering, Liaoning University of Technology, Jinzhou 121001, China.
Rev Sci Instrum. 2020 May 1;91(5):055003. doi: 10.1063/1.5135956.
In this study, a resonant type piezoelectric vibrator for driving a flexible body is proposed and its driving principle is discussed. The flexible body driven in this article is rigid in the longitudinal direction and flexible in the transverse direction, such as in metal straps and metal wires. The exciting signals used in the piezoelectric transducer in the horizontal and vertical directions are both sinusoidal signals, possessing a phase shift of π/2. Two third-order orthogonal bending in-plane modes of the same frequency were effectively excited, and an elliptic motion formed on the end plane of the vibrator toothed structure. A flexible body was then effectively driven by friction under a certain amount of tension. The proposed vibrator was designed using the finite element method, and the flexible drive models were established, while the output force in the contact friction was analyzed. The vibration characteristics of the vibrator were tested in order to obtain the resonance frequencies and responses. An experimental system was then established to test the mechanical output characteristics. The results demonstrate that the difference in thickness, tension force, and surface roughness between the flexible bodies confer great influence on driving. With a thickness of 0.01 mm, 0.02 mm, and 0.03 mm, the flexible metal strap velocity was found to be 24 mm/s, 43.64 mm/s, and 10.43 mm/s under the corresponding proper tension, smooth surface, and voltage of 200Vp-p, respectively.
在本研究中，提出了一种用于驱动柔性体的谐振型压电振动器，并讨论了其驱动原理。本文所驱动的柔性体在纵向是刚性的，而在横向是柔性的，例如金属带和金属线。压电换能器在水平和垂直方向上使用的激励信号均为正弦信号，具有π/2的相位差。有效地激发了两个相同频率的三阶正交平面内弯曲模式，并在振动器齿结构的端面上形成了椭圆运动。然后，在一定张力下通过摩擦有效地驱动柔性体。利用有限元方法设计了所提出的振动器，建立了柔性驱动模型，同时分析了接触摩擦中的输出力。测试了振动器的振动特性以获得共振频率和响应。然后建立了一个实验系统来测试机械输出特性。结果表明，柔性体之间的厚度、张力和表面粗糙度差异对驱动有很大影响。在厚度分别为0.01mm、0.02mm和0.03mm时，在相应合适的张力、光滑表面和200Vp-p电压下，柔性金属带的速度分别为24mm/s、43.64mm/s和10.43mm/s。
