A Novel Bionic Piezoelectric Actuator Based on the Walrus Motion
Jianping Li, Junjie Cai, Nen Wan, Yili Hu, Jianming Wen, Junwu Kan, Song Chen, Hongwei Zhao
Abstract
Abstract A novel bionic piezoelectric actuator based on the walrus motion to achieve high performance on large working stroke for micro/nano positioning systems is first proposed in this study. The structure of the proposed walrus type piezoelectric actuator is described, and its motion principle is presented in details. An experimental system is set up to verify its feasibility and explore its working performances. Experimental results indicate that the proposed walrus type piezoelectric actuator could realize large working stroke with only one driving unit and one coupled clamping unit; the maximum stepping displacement is Δ L max = 19.5 μm in the case that the frequency f = 1 Hz and the voltage U = 120 V; the maximum speed V max = 2275.2 μm · s −1 when the frequency f = 900 Hz and the voltage U = 120 V; the maximum vertical load m max = 350 g while the voltage U = 120 V and the frequency f = 1 Hz. This study shows the feasibility of mimicking the bionic motion of the real walrus animal to the design of piezoelectric actuators, which is hopeful for the real application of micro/nano positioning systems to achieve large working stroke and high performance.