X-pod: a small footprint multi-legged piezoelectric single-crystal unimorph-based actuator concept

Abstract

Multi-legged piezoelectric single-crystal actuators with small footprints using an X-pod approach, namely, the Tripod and Tetrapod, have been conceptualized, each leg being a unimorph driven by Pb(Zn1/3Nb2/3)O3–(6–7)%PbTiO3 (PZN–(6–7)%PT) single crystals of [110]L × [001]T cut. Both finite-element analysis and experimental investigations are carried out to evaluate the performance of the Tripod and Tetrapod actuators. When operated at 0.57 kV mm−1, both actuators exhibit an axial displacement of nearly 60 µm. Blocking forces of about 10 N and 14 N are observed for the Tripod and the Tetrapod, respectively. The blocking forces are roughly doubled if the perfectly clamped condition is imposed for the legs at the pedestal end while the axial displacement is lowered marginally by 12%. In addition to small footprints, other attractive features of the actuators include greater flexibility to modify the leg geometry and their inclination to suit the application.

Iterative piezo response function-based optimization for static shape control of cantilever beam using nonlinear piezoactuators

“…The voltage matrix of 'n' piezoactuators can be defined by equation (10) where V i represents the electric potential of ith piezoactuator. For a given set of electrode potential of piezoactuators, the achieved shape profile (Y) of smart structure can be defined by equation (11),…”

“…These analytical and approximate solutions are used with various sophisticated techniques to design and optimize piezoactuated structures and devices to improve the performance and achieve more accuracy and precision. Structures and devices using piezoactuators are used for various applications such as shape control [8,9], micro/nano position stage [10,11], vibration and noise suppression systems [12,13] etc. Shape control of flexible structures is mainly done to enhance the performance efficiency of structures [9,14].…”