Development of Testing Methodologies for Nonlinear Solid State Actuation Materials

摘要

A derivation is presented and demonstrated for finding actuation efficiency and work output for electromechanically fully coupled, non- linear systems working against generalized quasi-static loads. A component testing facility with programmable impedance and closed- loop capability was designed, built, and operated to measure work output and actuation efficiency of a discrete actuator working against both linear and non-linear loads. The complete design of the testing facility is presented with an overview of the rationale behind its design decisions. Increases in the mechanical work output of the actuator were found to be possible by using nonlinear loads instead of linear loads. Theory and formulation are presented, suitable for modeling and performance analysis of actuator and sensor devices composed of deformable, electromechanically coupled, highly insulating materials with non-linear response functions. The testing facility was renovated and used for feed- forward open-loop test methodology utilizing a Force-Voltage model developed from Ritz Formulation. Linear tests correlated well with theoretical prediction. Results show actuation efficiency of a non-linear system is about 200% that of a linear system, and its work output is about 245% that of the linear system. Research is recommended on behavior and performance of active materials and actuation efficiency of piezoelectrically-driven systems under dynamic loads.