大型天线在对地观测、天基预警等航天工程领域有着重要的应用背景，由于天线尺寸大、柔性高且阻尼小，在轨运行时极易产生大幅的非线性振动，研究了大型空间平面相控阵天线的非线性动力学与振动主动控制。首先，采用非线性有限元方法对天线结构的几何非线性动力学问题进行求解；其次，采用绳索作动器对天线结构的振动进行控制，给出考虑绳索控制力单向性和饱和性的控制律设计方法；最后，通过数值仿真对理论研究成果进行验证。仿真结果显示，该控制策略能够有效地对天线结构的振动进行抑制。
Abstract
Large antennas have important application backgrounds in aerospace engineering fields of earth observation and space-based early warning.However, due to their large size, high flexibility and low damping, they are prone to generate significant nonlinear vibration during in-orbit operation.Here, nonlinear dynamic behavior and active vibration control of large spatial planar phased array antennas were studied.Firstly, the nonlinear finite element method was used to solve geometric nonlinear dynamic problem of antenna structure.Secondly, a cable actuator was used to control vibration of antenna structure, and a design method for the control law considering the unidirectionality and saturation of cable control force was proposed.Finally, the theoretical study results were verified with numerical simulation.The simulation results showed that the proposed control strategy can effectively suppress vibration of the studied antenna structure.
关键词
平面相控阵天线 /
非线性振动 /
控制设计 /
绳索作动器
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Key words
planar phased array antenna /
nonlinear vibration /
control design /
cable actuator
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