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Opto-Mechanical Modeling of the Herschel Space Telescope at ESA/ESTEC

机译：ESA / ESTEC的赫歇尔太空望远镜的光机械建模

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In this paper the opto-mechanical modeling of the Herschel infrared space telescope at ESA/ESTEC is presented. The aim of the paper is to give an overview of all modeling activities that took place between 2006 and 2010. In 2006 ESA commissioned a Tiger Team to review the discrepancy between the prediction and measurement of the change in telescope back focal length of the Herschel infrared space telescope. The understanding of the discrepancy was essential since the telescope did not have a refocusing mechanism and hence had to be shimmed to the focus position at cryogenic operational temperature. A team of 16 engineers and scientists collocated at ESA/ESTEC to review the finite element models, optical models and test data used for the prediction of the telescope back focal length. The methodology of prediction, the uncertainties and the obtained results were critically assessed. The team used various modeling techniques including paraxial optical models, first order linear thermal expansion models, full system and metrology ray tracing, deterministic and stochastic thermo-elastic finite element analyses. The opto-mechanical analysis techniques, assumptions and results are discussed. In addition the impact of new measurements of coefficients of thermal expansion, performed after shimming of the telescope flight model, are addressed.
机译：本文介绍了ESA / ESTEC的Herschel红外太空望远镜的光机械模型。本文的目的是概述2006年至2010年之间发生的所有建模活动。2006年，欧洲航天局（ESA）委托Tiger团队审查了Herschel红外望远镜的后焦距变化的预测与测量之间的差异太空望远镜。由于望远镜没有重新聚焦机制，因此必须了解这一差异，因此必须将其匀场到低温操作温度下的聚焦位置。由ESA / ESTEC组成的由16名工程师和科学家组成的团队审查了用于预测望远镜后焦距的有限元模型，光学模型和测试数据。严格评估了预测方法，不确定性和获得的结果。该团队使用了各种建模技术，包括近轴光学模型，一阶线性热膨胀模型，完整的系统和计量射线跟踪，确定性和随机热弹性有限元分析。讨论了光机械分析技术，假设和结果。此外，还解决了在望远镜飞行模型匀场后进行的新的热膨胀系数测量结果的影响。

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