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

对非对称柔性卷曲太阳能电池板的屈曲特性、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。这些分析是基于一个广义的柔性卷曲太阳能电池板模型，该模型假定由于几何不对称而产生的非对称载荷条件。利用哈勃太空望远镜太阳电池阵列的数据进行了数值计算。屈曲分析确定了可能发生屈曲的临界屈曲力和屈曲振型，结果表明，对于HST太阳帆板，将发生扭转屈曲。最小屈曲力略大于太阳帆板的典型设计值。计算结果还表明，由于弯扭耦合效应，扭转屈曲力上升，弯曲屈曲力下降。振动分析表明，结构的固有频率和振型为…S在很大程度上依赖于BiSTEM的平均轴向力。计算结果表明，在轴向力取太阳帆板设计值的情况下，虽然各振型均受弯扭耦合的影响，但第一阶振型以整体扭转变形为主，第二阶振型以弯曲为主，高阶振型以太阳包层挠度为主。计算了太阳帆板在轨道上典型的昼夜过渡等突发性辐射加热作用下的准静态结构响应。结果表明，结构响应与压轴力有很大关系。当轴向力接近屈曲力时，太阳电池外板的中点处出现了较大的弯矩。结果表明，热诱导准静态扭转变形可能是导致太阳电池阵列失效的原因。较少

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