失谐弱耦合卫星天线结构振动分析及预测控制

摘要

In order to research the vibration control of weak-coupling antenna structures in satellite, a .simplified dynamics structure model is established in the present study. The vibration modes localization in the structures is investigated. Active vibration control of the structures is studied by applying predictive control method and linear quadratic regulator (LQR) control method, respectively. The simulation results show that small disorder of the weak-coupling antenna structures can induce remarkable localization of vibration modes. The vibration control effects predicted with the present method axe superior to those with LQR method. The results also show that the predictive control method has perfect performance in vibration control analysis while the models are mismatched due to the structure disorder. Therefore, the disorder must be considered seriously in active vibration control of weak coupling antenna structures.%为了研究弱耦合卫星天线结构的振动控制,建立了该结构的简化计算模型,并针对该模型研究了弱耦合卫星天线结构动力学性能的特殊性:结构失谐时的振动模态局部化现象;针对失谐前后的结构,采用预测控制方法进行了振动控制,并与二次线性最优控制(LQR)方法的振动抑制效果进行了对比.仿真结果表明:弱耦合星载天线结构参数的微小失谐会导致结构振动产生明显的模态局部化;采用预测控制方法进行结构振动控制的效果明显优于LQR控制方法,且在失谐导致的模型失配时,预测控制方法对结构振动亦有较好的抑制;在进行此种结构的振动主动控制时必须考虑到结构失谐的影响.