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Thermal shock induced dynamics of a spacecraft with a flexible deploying boom

机译：热冲击引起具有灵活展开臂的航天器动力学

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摘要

The dynamics in the process of deployment of a flexible extendible boom as a deployable structure on the spacecraft is studied. For determining the thermally induced vibrations of the boom subjected to an incident solar heat flux, an axially moving thermal-dynamic beam element based on the absolute nodal coordinate formulation which is able to precisely describe the large displacement, rotation and deformation of flexible body is presented. For the elastic forces formulation of variable-length beam element, the enhanced continuum mechanics approach is adopted, which can eliminate the Poisson locking effect, and take into account the tension-bending-torsion coupling deformations. The main body of the spacecraft, modeled as a rigid body, is described using the natural coordinates method. In the derived nonlinear thermal-dynamic equations of rigid-flexible multibody system, the mass matrix is time-variant, and a pseudo damping matrix which is without actual energy dissipation, and a heat conduction matrix which is relative to the moving speed and the number of beam element are arisen. Numerical results give the dynamic and thermal responses of the nonrotating and spinning spacecraft, respectively, and show that thermal shock has a significant influence on the dynamics of spacecraft.
机译：研究了在太空飞船上作为可展开结构的柔性可伸缩吊臂展开过程中的动力学。为了确定受到入射太阳热通量影响的动臂的热致振动，提出了一种基于绝对节点坐标公式的轴向移动热动力梁单元，该单元能够精确描述柔性体的大位移，旋转和变形。 。对于变长梁单元的弹力计算，采用了增强的连续力学方法，可以消除泊松锁定效应，并考虑了拉弯扭耦合变形。使用自然坐标方法描述了建模为刚体的航天器主体。在推导的刚柔多体系统非线性热力学方程中，质​​量矩阵是时变的，没有实际能量耗散的拟阻尼矩阵，以及与运动速度和数量有关的热传导矩阵出现梁单元的位移。数值结果分别给出了非旋转航天器和旋转航天器的动力和热响应，并表明热冲击对航天器的动力有重大影响。

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  • 来源
    《Acta astronautica》 |2017年第12期|123-131|共9页
  • 作者

    Shen Zhenxing; Li Huijian; Liu Xiaoning; Hu Gengkai;

  • 作者单位

    Yanshan Univ, Sch Civil Engn & Mech, Key Lab Mech Reliabil Heavy Equipment & Large Str, Qinhuangdao 066004, Peoples R China;

    Yanshan Univ, Sch Civil Engn & Mech, Key Lab Mech Reliabil Heavy Equipment & Large Str, Qinhuangdao 066004, Peoples R China;

    Beijing Inst Technol, Sch Aerosp Engn, Minist Educ, Key Lab Dynam & Control Flight Vehicle, Beijing 100081, Peoples R China;

    Beijing Inst Technol, Sch Aerosp Engn, Minist Educ, Key Lab Dynam & Control Flight Vehicle, Beijing 100081, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Axially moving beam; Thermally induced vibrations; Absolute nodal coordinate formulation; Rigid-flexible coupling;

    机译：轴向运动梁;热引起的振动;绝对节点坐标公式;刚柔耦合;

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