Partial and Full Inverse Compensation for Hysteresis in Smart Material Systems
NORTH CAROLINA STATE UNIV AT RALEIGH CENTER FOR RESEARCH IN SCIENTIFIC COMPUTATION
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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, we discuss two techniques to compensate for hysteresis in high performance transducers. The first is based on a complete transducer model, and the resulting compensator accommodates both the constitutive nonlinearities and hysteresis inherent to the smart material components. The second technique employs a partial inverse compensator based on anhysteretic models for the material behavior. This accommodates the constitutive nonlinearities but does not incorporate the hysteresis the latter phenomenon is then addressed through the inclusion of a feedback loop in the controller. The performance of the partial inverse compensator is illustrated in the context of a high force Terfenol-D transducer.
- Electrical and Electronic Equipment