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Solar Sail Topology Variations Due to On-Orbit Thermal Effects

机译：轨道热效应引起的太阳帆拓扑变化

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The objective of this research was to predict the influence of nonuniform temperature distribution on solar sail topology and the effect of such topology variations on sail performance (thrust and torque). Specifically considered were the thermal effects due to on-orbit attitude control maneuvers. Such maneuvers are expected to advance the sail to a position off-normal to the sun by as much as 35 deg; a solar sail initially deformed by typical pretension and solar pressure loads may suffer significant thermally induced strains, due to the nonuniform heating caused by these maneuvers. This on-orbit scenario was investigated through development of an automated analytical shape model that iterates many times between sail shape and sail temperature distribution before converging on a final coupled thermal-structural affected sail topology. This model uses a validated geometrically nonlinear finite element model and a thermal-radiation subroutine. It was discovered that temperature gradients were deterministic for the off-normal solar angle cases, as were thermally induced strains. Performance effects were found to be moderately significant but not as large as initially suspected. A roll torque was detected, and the sail center of pressure shifted by a distance that may influence on-orbit sail control stability.
机译：这项研究的目的是预测温度分布不均匀对太阳帆拓扑的影响，以及这种拓扑变化对帆性能（推力和扭矩）的影响。特别考虑的是在轨姿态控制机动所产生的热效应。预计这种机动将使帆前进至与太阳垂直的位置最多35度；由于这些动作引起的不均匀加热，最初由于典型的预紧力而变形的太阳帆会受到明显的热诱导应变，而太阳压力载荷可能会遭受明显的热诱导应变。通过开发自动分析形状模型来研究此在轨情况，该模型在风帆形状和风帆温度分布之间进行了多次迭代，然后收敛到最终耦合的受热结构影响的风帆拓扑。该模型使用经过验证的几何非线性有限元模型和热辐射子例程。发现对于非正常太阳角情况，温度梯度是确定的，与热致应变一样。发现性能影响是中等显着的，但没有最初怀疑的那么大。检测到侧倾扭矩，并且帆的压力中心偏移了可能影响在轨帆控制稳定性的距离。

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