Nonlinear optimal and narrowband feedback control designs are developed and experimentally implemented on a magnetostrictive Terfenol-D actuator. The nonlinear optimal control design incorporates a nonlinear and hysteretic ferromagnetic homogenized energy model within an optimal control formulation to reduce displacement tracking errors and increase bandwidth. Improvements in robustness in the steady-state regime are achieved by utilizing narrowband feedback. A narrowband filter is implemented by treating the nonlinear and hysteretic magnetostrictive constitutive ...
Smart material transducers employing piezoceramic or magnetostrictive drive components typically exhibit constitutive nonlinearities and hysteresis at moderate to high drive levels. While feedback mechanisms or careful choice of operating regimes can often reduce these effects, spillover into high frequency dynamics and phase lags associated with the two phenomena will degrade the controller performance at high drive levels in the absence of additional compensation or nonlinear control design. In this paper, ...
This paper addresses the validation of an energy-based inverse compensator for hysteresis in ferromagnetic transducers. At moderate to high drive levels such transducers exhibit significant constitutive non-linearities and hysteresis due to domain mechanisms inherent to the constituent materials. This behavior must be accommodated to utilize the full capabilities of the transducers in high performance applications. In this paper, an ODE model based on magnetostatic energy principles is employed to characterize ...
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