Liu Yingxiang, Shi Shengjun, Li Chunhong, Chen Weishan, Wang Liang, Liu Junkao
State Key Laboratory of Robotics and System, Harbin Institute of Technology, No.92, West Da-Zhi Street, Harbin 150001, Heilongjiang Province, China.
State Key Laboratory of Robotics and System, Harbin Institute of Technology, No.92, West Da-Zhi Street, Harbin 150001, Heilongjiang Province, China.
Ultrasonics. 2018 Mar;84:81-86. doi: 10.1016/j.ultras.2017.10.017. Epub 2017 Oct 26.
A bi-directional standing wave linear piezoelectric ultrasonic actuator with four driving feet is proposed in this work. Two sandwich type transducers operated in longitudinal-bending hybrid modes are set parallelly. The working mode of the transducer is not simple hybrid vibrations of a longitudinal one and a bending one, but a special coupling vibration mode contained both longitudinal and bending components. Two transducers with the same structure and unsymmetrical boundary conditions are set parallelly to accomplish the bi-directional driving: the first transducer can push the runner forward, while the other one produces the backward driving. In the experiments, two voltages with different amplitudes are applied on the two transducers, respectively: the one with higher voltage serves as the actuator, whereas the other one applied with lower voltage is used to reduce the frictional force. The prototype achieves maximum no-load speed and thrust force of 244 mm/s and 9.8 N. This work gives a new idea for the construction of standing wave piezoelectric ultrasonic actuator with bi-directional driving ability.
本文提出了一种具有四个驱动脚的双向驻波线性压电超声致动器。两个以纵弯混合模式工作的夹心式换能器平行设置。换能器的工作模式不是纵向振动和弯曲振动的简单混合，而是一种包含纵向和弯曲分量的特殊耦合振动模式。两个结构相同但边界条件不对称的换能器平行设置以实现双向驱动：第一个换能器可推动滑块向前，而另一个则产生向后驱动。在实验中，分别在两个换能器上施加不同幅度的两个电压：电压较高的那个用作致动器，而施加较低电压的另一个用于减小摩擦力。该原型实现的最大空载速度和推力分别为244 mm/s和9.8 N。这项工作为构建具有双向驱动能力的驻波压电超声致动器提供了新思路。
