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盘绕式伸展臂是一种空间伸展臂,可用于太阳电池阵、太阳帆、探测臂等空间伸展机构.它有2种展开模式:逐层展开和螺旋展开.以三角形横框铰接盘绕式伸展臂为对象,分析了以逐层展开模式伸展的原理.首先,由于斜拉索不可伸长,导致横杆在伸展臂变形过程中会发生弯曲,并有一个最大弯曲形态.通过在MSC.ADAMS中建立盘绕式伸展臂模型进行仿真计算,可以得到横杆刚度对伸展臂展开过程的影响.以此工作为基础,提出判据:纵杆对第2层横杆的压缩能力和横杆的抗弯能力决定了伸展臂的展开模式,利用相关仿真模型,对这一结论进行了验证.最后,用弹性细杆的Kirchhoff动力学研究了纵杆变形,得到了伸展臂构型参数和展开模式之间的规律.该结果可以作为盘绕式伸展臂设计阶段的参考.
Winding extension arm is a kind of space extension arm, which can be used for space extension mechanism such as solar cell array, solar sail, detection arm, etc. It has 2 kinds of unfolding modes: unfolding layer by layer and unwinding by spiral. As the object, the principle of stretching in a layer-by-layer mode is analyzed.First, due to the inelastic elongation of the stay cable, the bar will be bent during the deformation of the extension arm and have a maximum bending shape. Based on this work, the criterion is put forward that the longitudinal bar’s compressive ability to the second floor horizontal bar and the bending resistance of the horizontal bar The ability determines the deployment mode of the extension arm, and uses the related simulation model to verify this conclusion.Finally, the deformation of the longitudinal rod is studied by the Kirchhoff dynamics of the elastic thin rod, and the relationship between the parameters of the deployment arm and the deployment mode is obtained The results can be used as a reference for the design phase of the winding arm.