压电主动杆Maxwell动力学建模与鲁棒H∞控制研究

未来高性能航天器迫切需要基于压电作动的主动减振控制.针对压电作动器和检波器组成的主动杆系统,基于控制目的,推导了作动器Maxwell动力学模型,为了更好的反映检波器噪声和低频较差性能带来的影响,采用同价的SUITE动杆的系统辨识模型设计了H∞控制器,仿真结果表明H∞控制器对100Hz的正弦扰动有效隔离73%(11.4dB),对频带250Hz的白噪声有效隔离70%(10.5dB).

Maxwell Dynamic Modeling and Robust H∞ Control of Piezoelectric Active Struts

Active vibration isolation, based on piezoelectric stack actuators, is needed for future space sensitive payloads which have increased performance. A lumped parameter Maxwell dynamic model of a piezoelectric active strut, consisting of a piezoelectric stack actuator and a geophone, is derived for the purpose of vibration control. A robust H∞ synthesis controller is designed based on the identification model of SUITE active struts that capture noise and poor low frequency performance of geophones additionally. The vibration between 5Hz - 400Hz is isolated evidently, and the simulation results indicates that a 100Hz sinusoid disturbance is isolated by 73%(11.4dB) and broadband white noise is isolated by 70% (10.5dB) by the H∞ reduced-order controller.