输入受限的压电陶瓷驱动平台预设性能控制

Prescribed Performance Control with Input Constrain for Piezoactuator-driven Stage

  • 摘要: 针对压电陶瓷驱动平台中存在迟滞非线性和输入饱和的问题,提出一种预设性能的反演控制方法.通过神经网络逼近系统中的迟滞非线性部分并实现输入受限的有效补偿.通过预设性能函数和误差转换函数建立系统等效误差模型,并使用泰勒多项式表示新的等效误差以避免常规预设性能函数出现奇异值的问题.整个系统通过反演法逐步进行预设性能控制器设计.利用李亚普诺夫稳定理论证明整个闭环系统的信号是一致最终有界的,且输出误差限定在预先设定的范围内.仿真结果表明方法的有效性.

     

    Abstract: This paper describes the design of a prescribed performance for the piezoactuator-driven stage with control input saturation and hysteretic nonlinearity by using the backstepping scheme. Neural networks are used to approximate the hysteretic nonlinearity of the system and compensate for input constraints. A system-equivalent error model is established using the prescribed performance function and error transformation function. Taylor polynomials are used to express a new equivalent error, and the singular value problem in the conventional prescribed performance control is avoided. The controller of the entire system is designed step by step by using the backstepping control method. Lyapunov functions are used to prove that the signals of the entire closed-loop system are uniformly ultimately bounded, and the output error is limited to the prescribed range. Simulation results show the effectiveness of the method.

     

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