Rate-dependent Hammerstein Model and H∞ Robust Tracking Control of Giant Magnetostrictive Actuators
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摘要: 利用Hammerstein模型对超磁致伸缩作动器(Giant magnetostrictive actuators,GMA)的率相关迟滞非线性进行建模,分别以改进的 Prandtl-Ishlinskii(Modified Prandtl-Ishlinskii)模型和外因输入自回归模型(Autoregressive model with exogenous input,ARX)代表Hammerstein模型中的静态非线性部分和线性动态部分,并给出了模型的辨识方法. 此模型能在1~100Hz频率范围内较好地描述GMA的率相关迟滞非线性. 提出了带有逆补偿器和H∞鲁棒控制器的二自由度跟踪控制策略,实时跟踪控制实验结果证明了所提策略的有效性.
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关键词:
- 磁致伸缩作动器 /
- 率相关迟滞非线性 /
- Hammerstein模型 /
- MPI模型 /
- H∞鲁棒控制
Abstract: A Hammerstein model is proposed to model the rate-dependent hysteresis nonlinearity of giant magnetostrictive actuators (GMA). A modified Prandtl-Ishlinskii (MPI) model and an autoregressive model with exogenous input (ARX) are used to represent the static nonlinear part and the linear dynamic part of the Hammerstein model, respectively. A model identification method is also given. The proposed model can describe the rate-dependent hysteresis of GMA from 1Hz to 100Hz well. A two DOF control system with an inverse compensator and an H∞ robust controller is designed for tracking control. Real-time trajectory tracking control results show that the proposed strategy is effective. -
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