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Aging of Thermal Coatings on Low Earth Orbit: In-Flight Measurements and Modeling

机译:低地球轨道上热涂层的老化:飞行中的测量和建模

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摘要

The aging of thermal coatings critically impacts spacecraft thermal balance. Because few in-flight data were available about the aging of materials after a long exposure on sun-synchronous orbit, Centre National d'Etudes Spatiales developed a low-cost experiment called THERME aiming to characterize the evolution of solar absorptivity through a temperature measurement. A data set covering 27 years has thus been generated. The objective of this work is to analyze this very large set of telemetry measurements, taking into account the available satellite parameters (orbit and orientation) and environmental parameters (ultraviolet and atomic oxygen) to identify the most likely causes for the solar absorptivity evolution. To this end, a quantitative model of the evolutions of solar absorptivity has been developed. This model includes the intrinsic degradation of the substrate under ultraviolet radiation, the degradation attributed to contamination, and the erosion of this contamination by atomic oxygen. Although deliberately simple to limit the number of model parameters, it enables one to satisfyingly reproduce the time evolution of solar absorptivity and to explain the differences observed depending on the solar cycle, on the orbit of the satellite and on the position of the THERME devices on the satellite.
机译:热涂层的老化严重影响航天器的热平衡。由于在长期暴露在太阳同步轨道上后,几乎没有关于材料老化的机上数据,因此,国家国家空间研究中心开发了一种名为THERME的低成本实验,旨在通过温度测量来表征太阳吸收率的演变。这样就生成了一个涵盖27年的数据集。这项工作的目的是分析大量遥测数据,同时考虑可用的卫星参数(轨道和方向)和环境参数(紫外线和原子氧),以确定最有可能引起太阳吸收率演变的原因。为此,已经开发了太阳吸收率演变的定量模型。该模型包括基材在紫外线辐射下的固有降解,归因于污染物的降解以及原子氧对这种污染物的侵蚀。尽管故意限制模型参数的数量很简单,但它可以使人满意地再现太阳吸收率的时间演变,并解释根据太阳周期,卫星轨道和THERME装置的位置而观察到的差异。卫星。

著录项

  • 来源
    《Journal of Spacecraft and Rockets》 |2016年第6期|1141-1145|共5页
  • 作者单位

    Off Natl Etud & Rech Aerosp, Space Environm Dept, F-31055 Toulouse, France;

    Off Natl Etud & Rech Aerosp, Space Environm Dept, F-31055 Toulouse, France;

    Ctr Natl Etud Spatiales, Qual Insurance, F-31401 Toulouse, France;

    Ctr Natl Etud Spatiales, Qual Insurance, F-31401 Toulouse, France;

    Ctr Natl Etud Spatiales, Qual Insurance, F-31401 Toulouse, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
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