研究目的

To propose an enhancement of the Bouc–Wen hysteresis model to capture the frequency-dependent hysteretic behavior of a thin bimorph-type piezoelectric actuator which also exhibits odd harmonic oscillation (OHO) at specific input frequencies, and to develop a compensator that utilizes the mathematical structure of the enhanced Bouc–Wen model to compensate the hysteresis and to attenuate the OHO.

研究成果

The proposed enhanced Bouc–Wen model provides high modeling accuracy for frequency-dependent hysteresis nonlinearity which also exhibits the third/fifth harmonic oscillation. The hysteresis compensator based on the proposed model effectively attenuates the odd harmonic oscillation, demonstrating excellent performance in the tracking control experiment.

研究不足

The study focuses on modeling and compensating the third and fifth harmonic components of the odd harmonics in the actuator's response, as higher odd harmonics were not observed in the input range of interest. The control performance may be affected by inaccuracies in the identified model parameters.