The ARIEL mission is a space project consisting of a spacecraft with the goal of detecting exoplanets and observing the characteristics of their atmospheres. One of the main sub-systems of the payload is the telescope that must operate under cryogenic conditions to guarantee its adequate performance and the mission success. One of the critical aspects in the development of a space telescope is the stability and the related analyses required to evaluate the degree of deformation of the system under all environmental conditions, with special emphasis on the different and extreme temperature ranges reached during the mission. This assessment involves the close collaboration between three different disciplines: thermal, structural and optical design. This paper describes the work done in the ARIEL project in the field of the structural stability analysis, showing the process to achieve reliable and accurate results. The main novelty of this work is the validation of the structural model to achieve the required level of precision in the displacements fields calculated numerically to provide reliable and accurate deformations that will allow the assessment of the thermoelastic effects on the optical performance of the main telescope. The results of the structural simulations show how the telescope assembly is deformed under the different analysed conditions, which will allow the design of compensation mechanisms to mitigate these effects.

ARIEL任务是一个由航天器组成的太空项目，旨在探测系外行星并观察其大气特征。有效载荷的主要子系统之一是望远镜，必须在低温条件下运行以确保其足够的性能和任务成功。太空望远镜发展的关键方面之一是稳定性和相关分析，以评估系统在所有环境条件下的变形程度，并特别着重于任务期间达到的不同和极端温度范围。这项评估涉及三个不同学科之间的紧密合作：热学，结构和光学设计。本文介绍了ARIEL项目在结构稳定性分析领域所做的工作，展示了获得可靠和准确结果的过程。这项工作的主要新颖之处在于验证了结构模型，以在通过数值计算得出的位移场中达到所需的精度水平，以提供可靠且准确的变形，从而可以评估对主望远镜光学性能的热弹性效应。结构仿真的结果显示了望远镜组件在不同的分析条件下如何变形，这将允许设计补偿机制来减轻这些影响。这项工作的主要新颖之处在于验证了结构模型，以在通过数值计算得出的位移场中达到所需的精度水平，以提供可靠且准确的变形，从而可以评估对主望远镜光学性能的热弹性效应。结构仿真的结果显示了望远镜组件在不同的分析条件下如何变形，这将允许设计补偿机制来减轻这些影响。这项工作的主要新颖之处在于验证了结构模型，以在通过数值计算得出的位移场中达到所需的精度水平，以提供可靠且准确的变形，从而可以评估对主望远镜光学性能的热弹性效应。结构仿真的结果显示了望远镜组件在不同的分析条件下如何变形，这将允许设计补偿机制来减轻这些影响。