This study aims to develop an advanced integral terminal sliding-mode robust control method using a disturbance observer (DO) to suppress the forced vibration of a large space intelligent truss structure (LSITS). First, the dynamics of the electromechanical coupling of the piezoelectric stack actuator and the LSITS, based on finite element and Lagrangian methods, are established. Subsequently, to constrict the vibration of the structure, a novel integral terminal sliding-mode control (ITSMC) law for the DO is used to estimate the parameter perturbation of the LSITS based on a continuous external disturbance. Simulation results show that, under a forced vibration and compared with the ITSMC system without a DO, the displacement amplitude of the ITSMC system with the DO is effectively reduced. In the case where the model parameters of the LSITS deviate by ±50%, and an unknown continuous external disturbance exists, the control system with the DO can adequately attenuate the structural vibration and realize robust control. Concurrently, the voltage of the employed piezoelectric stack actuator is reduced, and voltage jitter is alleviated.

本研究旨在开发一种先进的积分终端滑模鲁棒控制方法，该方法使用干扰观测器 (DO) 来抑制大空间智能桁架结构 (LSITS) 的强迫振动。首先，基于有限元和拉格朗日方法，建立了压电堆栈致动器和 LSITS 的机电耦合动力学。随后，为了限制结构的振动，DO 的新型积分终端滑模控制 (ITSMC) 定律用于估计基于连续外部扰动的 LSITS 的参数扰动。仿真结果表明，在受迫振动下，与不带DO的ITSMC系统相比，带DO的ITSMC系统的位移幅值有效减小。在LSITS模型参数偏差±50%，存在未知连续外部扰动的情况下，带有DO的控制系统可以充分衰减结构振动，实现鲁棒控制。同时，降低了所采用的压电堆致动器的电压，减轻了电压抖动。