中国空间科学技术

中国空间科学技术

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智能太阳翼动力学建模与模态分析

蒋建平;李东旭;   

  1. 国防科学技术大学航天与材料工程学院;
  • 发布日期:2008-08-25

Dynamic Modeling and Modal Analysis of Smart Solar Array

Jiang Jianping Li Dongxu (College of Aerospace and Material Engineering,National University of Defense Technology,Changsha 410073)   

  • Online:2008-08-25

被引次数

9

摘要： 研究柔性航天器的动力学与控制问题时,通常需要利用柔性附件的模态信息。为获取航天器的高精度姿态控制,必须解决柔性附件的振动抑制问题。配置压电传感/作动器是解决太阳翼振动控制的有效手段。针对基板表面粘贴压电传感/作动器的太阳翼,基于一阶剪切变形层板理论,建立了包含机电耦合效应对结构刚度贡献的有限元模型,并在连接机构等效梁单元中引入了轴向载荷。利用假设剪切应变方法解决了一阶剪切变形层板理论的剪切闭锁问题。仿真结果表明:太阳翼的动力学特征随压电传感/作动器配置方式的改变而改变;连接架轴向载荷可以大幅提高太阳翼的侧摆振动频率;给压电作动器施加控制电压可以增加太阳翼的结构阻尼。

关键词: 太阳翼, 剪切闭锁, 压电作动器, 模态分析

Abstract: Researches on the dynamic and control for the flexible spacecraft usually use the modal of the flexible appendages.In order to achieve precision attitude of the spacecraft,the vibration of the flexible appendages need to be suppressed.This problem can be solved effectively with piezoelectric sensor/actuator.The finite element modeling of the solar array with piezoelectric sensor/actuator was presented.The mathematical model was based on the first order shear deformation (FSDT).The dynamic models included the mechanical-electrical coupling effect and axial load in the 3-D beam elements.The shear locking problem was solved by assuming a shear strain field.The results of the modal analysis show that the dynamic characteristics changes with the different distribution of piezoelectric sensor/actuator.The axial load in the tripod of the solar array can increase the swaying frequency largely.The piezoelectric actuators applied voltages can enhance the structural damp of the solar array.

Key words: Solar array, Shear locking, Piezoelectric actuators, Modal analysis, Finite element