绳驱桁架结构伸展臂的主动振动控制

伸展臂由于受到空间温度变化和卫星机动动作的影响，不可避免地会产生振动。在阻尼较低的空间环境中，这种振动衰减较慢，影响伸展臂的正常工作。因此，合适的振动控制方法对于伸展臂的正常工作至关重要。本文采用拉绳作为作动器的空间桁架结构伸展臂，研究其作动绳上铰链串联顺序的优化和模型预测控制律的设计，这两部分内容均考虑了作动绳的单边约束和饱和约束。首先，通过ANSYS软件获取结构的模态信息；然后结合系统可控性原理和遗传算法计算出作动绳上铰链串联最优顺序；最后，在数值仿真中，通过设计的控制率对一个由四个单元组成的桁架结构伸展臂的振动控制过程进行仿真分析。结果表明，提出的作动绳串联铰链的方式能够有效抑制伸展臂的振动。

Active vibration control of cable-driven deployable truss structure mast

A deployable mast inevitably experiences vibration due to temperature variations and satellite maneuver actions in space.In low-damping space environments, these vibrations decay slowly and significantly affect the normal operation of a deployable mast.Therefore, implementing an appropriate vibration control strategy is crucial for ensuring a proper operation of a deployable mast.This study specifically focuses on a deployable truss mast that employs cables as actuators.The research includes the optimization of actuator positions and the design of control laws, taking into account both unilateral and saturated constraints of the cable actuators.First, modal information about the structure is obtained using the commercial software ANSYS.Second, an actuator position optimization method is devised by the controllability principles and the genetic algorithm.Finally, the deployable truss mast consisting of four units is simulated and analyzed.The results demonstrate that the proposed optimal actuator position and the control law effectively mitigate the vibration and ensure the stable operation of the deployable mast.