Development of high-precision thermal models for the simulation of thermally induced perturbation effects

开发用于模拟热致扰动效应的高精度热模型

• 批准号: 120974662
• 负责人: Professor Dr. Hansjörg Dittus
• 金额: --
• 依托单位: Zentrum für angewandte Raumfahrttechnologie und Mikrogravitation (ZARM)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2011-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/120974662?language=en
• 关键词: Development; precision; thermal; models; simulation

Exact thermal modeling becomes increasingly important for high precision fundamental physics and geodesy missions where an exact knowledge of the thermal contributions to the disturbance budget is crucial for the mission success. We propose the development of a sophisticated tool for exact thermal modeling and exact thermal force/torque computation which can be applied to satellite missions or ground based experiments with high requirements on perturbation knowledge. Due to a surface-based computation approach it will also be possible to compute the disturbances originating from other influences like solar radiation pressure or space debris impact. As an application for the method, the thermal contribution of the Pioneer 10/11 probe to the disturbance budget will be computed thus using the method with a complete set of real flight telemetry data for an already flown deep space mission. This will lead to a better understanding of the thermal effects and clarifies the amount of anomalous acceleration that can be explained by thermal radiation.Likewise, the proposed method will be applied for other current high precision fundamental physics missions like LISA pathfinder, LISA and MICROSCOPE where an exact disturbance modeling is crucial for the mission success. Also geodesy missions will benefit from such an analysis. For LISA and Pioneer a sophisticated FE model will be developed and detailed thermal analysis will be conducted to improve the uncertainties in current thermal models [1, 2].The accuracy, handling and adaption of the ZARM Thermal Evaluation software (TES) for different mission concepts will be highly improved with respect to current tools for thermal modeling. Furthermore our approach is the first one that uses highly detailed FE models of the spacecraft geometries in a direct raytracing approach to compute the resulting forces and torques due to thermal radiation. As well as for the thermal modeling of spacebound experiments the method will be applicable to high precision experiments on Earth such as the Michelson-Morley experiment with optical resonators (see [3, 4] for details). Also the thermally induced disturbance forces on onboard sensors will be computable because each force fraction on each model surface is determined in the simulation process.

精确的热模拟对于高精度的基础物理和大地测量飞行任务变得越来越重要，在这些飞行任务中，对扰动预算的热贡献的准确知识对于飞行任务的成功至关重要。我们建议开发一种复杂的工具，用于精确的热建模和精确的热力/力矩计算，可应用于对摄动知识要求较高的卫星任务或地面实验。由于采用了基于地面的计算方法，还可以计算太阳辐射压力或空间碎片撞击等其他影响引起的扰动。作为该方法的一个应用，将计算先锋10/11探测器对扰动平衡的热贡献，从而使用该方法和已经飞行的深空任务的完整的真实飞行遥测数据。这将有助于更好地理解热效应，并澄清可以用热辐射解释的异常加速度的大小。同样，所提出的方法也将应用于其他当前高精度的基本物理任务，如LISA探路器、LISA和显微镜，在这些任务中，准确的扰动建模对任务的成功至关重要。此外，大地测量任务也将从这种分析中受益。对于LISA和先锋号，将开发一个复杂的有限元模型，并进行详细的热分析，以改善当前热模型[1，2]中的不确定性。ZARM热评估软件(TES)针对不同任务概念的准确性、可操作性和适应性将比现有的热建模工具有很大提高。此外，我们的方法是第一个在直接光线跟踪方法中使用航天器几何的非常详细的有限元模型来计算由于热辐射而产生的力和扭矩的方法。除了空间实验的热模型外，该方法还将适用于地球上的高精度实验，如带有光学谐振器的迈克尔逊-莫利实验(详见[3，4])。此外，由于每个模型表面上的每个力分数都是在模拟过程中确定的，因此机载传感器上的热诱导扰动力将是可计算的。