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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers >Thermally induced deformation of ultra-large truss support membrane structure
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Thermally induced deformation of ultra-large truss support membrane structure

机译：超大型桁架支撑膜结构的热致变形

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摘要

Large space structures experience changing thermal environment during orbiting the earth. The resultant temperature gradients induce structural deformations that may downgrade performance of payloads conducting high precision missions and even affect stability of the spacecraft. So, it is extremely important to analyze thermally induced deformation of large space structures for routine operation. In this paper, the ultra-large truss support membrane structure on satellite is characterized and studied. The methodology of thermal quasi-static deformation is formulated and the procedure of thermo-structural analysis is proposed. The thermostructural analysis model with hollow tubes is developed based on finite difference method and finite element method. With heat fluxes from solar radiation, earth radiation, and earth albedo radiation being considered, the temperature distribution filed is obtained from the thermal analysis and then applied to the structural analysis model to calculate quasi-static deformations and root mean square errors with orbital angles. Results show that temperature gradients along circumferential direction of tubes can induce prominent shape error. The proposed method is useful for predicting thermally induced deformation of large space structures and valuable for designing active control systems to compensate for disturbances.
机译：大型空间结构在绕地球运行时会经历不断变化的热环境。由此产生的温度梯度会引起结构变形，从而可能降低执行高精度任务的有效载荷的性能，甚至影响航天器的稳定性。因此，分析大空间结构的热致变形对于常规操作极为重要。对卫星上的超大型桁架支撑膜结构进行了表征和研究。提出了热准静态变形的方法，提出了热结构分析的程序。基于有限差分法和有限元法建立了空心管热结构分析模型。考虑到太阳辐射，地球辐射和地球反照率辐射的热通量，通过热分析获得了温度分布，然后将其应用于结构分析模型，以计算准静态变形和具有轨道角的均方根误差。结果表明，沿管子圆周方向的温度梯度会引起明显的形状误差。所提出的方法对于预测大空间结构的热致变形是有用的，并且对于设计主动控制系统以补偿干扰是有价值的。

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