Coupled Thermoelastic Response and Its Stability of Flexible Solar Array Subjected to Radiation Heating

对非对称柔性折叠太阳能电池阵的屈曲特性、固有振动特性、准静态热结构响应和动态热结构响应进行了理论分析。分析基于广义柔性卷式太阳能电池阵模型，该模型由于几何不对称而假定荷载条件不对称。利用哈勃太空望远镜太阳能阵列的数据进行了数值计算。屈曲分析建立了可能的临界屈曲力和屈曲模态，并表明高温超导太阳能电池阵在扭转时发生屈曲。最低屈曲力略大于太阳能电池阵的典型设计值。计算结果还表明，由于弯曲-扭转耦合作用，扭转屈曲力上升，弯曲屈曲力下降。振动分析表明，系统的固有频率和模态振型在很大程度上取决于系统的平均轴向压缩力。轴向力取设计值计算结果表明，虽然所有振动模态均受扭扭耦合的影响，但第一模态以整个太阳能帆板的扭转变形为主，第二模态为弯曲模态，较高模态以太阳能帆板挠度为主。计算了太阳电池阵在辐射突然加热下的准静态结构响应，如轨道上典型的昼夜跃迁。结果表明，轴向压缩力对结构响应有显著影响。当轴向力接近屈曲力时，外BiSTEM中点出现较大的弯矩。结果表明，热致准静态扭转变形可能是导致BiSTEM太阳能电池阵列失效的原因。采用模态分析方法，对太阳帆板的挠度和弯矩进行了分析计算。少

Theoretical analyses of the buckling characteristics, the natural vibration characteristics, the quasistatic thermal-structural responses, and the dynamic thermal-structural responses of an asymmetric flexible rolled-up solar array were presented. The analyses were based on a generalized flexible rolled-up solar array model assuming asymmetric loading conditions because of geometric asymmetry. Numerical calculations were conducted using the data for the solar arrays of the Hubble Space Telescope. The buckling analysis established the possible critical buckling forces and buckling modes and showed that, for the HST solar array, buckling will occur in torsion. The lowest buckling force was slightly larger than the typical design value of the solar array.Calculated results also suggests that the torsional buckling force rose and the bending buckling force fell because of the bending-torsion coupling effects. The vibration analysis made clear that the natural frequencies and the mode shape … More s depended considerably on the average compressive axial force of the BiSTEMs. Calculated results if the axial force took the design value for the solar array showed that the first mode was dominated by the torsional deformation of the whole solar array, the second mode was bending, and the higher modes were dominated by the solar blanket deflection, though all vibration modes were influenced by bending-torsional coupling. Quasistatic structural responses of the solar array subjected to sudden radiation heating such as typical night-day transition in orbit were calculated. The results showed that the structural response depends significantly on the compressive axial force. When the axial force was close to the buckling force, large bending moments occurred at the midpoint of the outer BiSTEM.The result suggests that thermally induced quasistatic torsional deformation may have caused the failure of the solar array BiSTEM.Time histories of the deflections and bending moments of the HST solar array were calculated analytically using modal analysis. Less