CAJ | 학술논문

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).
미래고성능항천기박절수요기우압전작동적주동감진공제.침대압전작동기화검파기조성적주동간계통,기우공제목적,추도료작동기Maxwell동역학모형,위료경호적반영검파기조성화저빈교차성능대래적영향,채용동개적SUITE동간적계통변식모형설계료H∞공제기,방진결과표명H∞공제기대100Hz적정현우동유효격리73%(11.4dB),대빈대250Hz적백조성유효격리70%(10.5dB).
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.