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A dynamic thermal Model for Design and Control of an 800-Element Open-Air Radio Telescope

机译：用于设计和控制800元素露天射电望远镜的动态热模型

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摘要

In earlier work we have described the thermal modelling for design and control of a fully insulated, and sometimes ventilated, high precision radio telescope. For such an insulated telescope the modelling of the time-variable dynamic influence of the thermal environment (air, sky and ground radiation, insolation) is relatively simple. The modelling becomes however quite complex for an open-air radio telescope where each individual member of the reflector backup structure (BUS) and the support structure (fork or yoke) is exposed under a, different and time-dependent aspect angle to the thermal environment, which applies in particular to solar radiation. We present a time-dependent 800-element thermal model of an open-air telescope. Using the IRAM 30 m radio telescope as the basic mechanical structure, we explain how the temperature induced, real-time pointing and reflector surface deformations can be derived when using as input the day of the year, the thermal environment, and the geographic position of the telescope and its changing pointing direction. Thermal modelling and results similar to those reported here can be used for radio telescope design and real-time control of pointing and surface adjustment of a telescope with active panels.
机译：在较早的工作中，我们描述了用于设计和控制全绝缘，有时通风的高精度射电望远镜的热模型。对于这样的绝缘望远镜，热环境（空气，天空和地面辐射，日照）随时间变化的动态影响的建模相对简单。然而，对于露天射电望远镜，建模变得相当复杂，其中反射器备用结构（BUS）和支撑结构（叉形或叉形）的每个单独构件都以不同，随时间变化的长宽比暴露于热环境中。 ，尤其适用于太阳辐射。我们提出了一个随时间变化的，具有800个元素的露天望远镜热模型。使用IRAM 30 m射电望远镜作为基本机械结构，我们解释了当使用一年中的某天，热环境和地理位置作为输入时，如何导出温度感应，实时指向和反射器表面变形。望远镜及其变化的指向方向。热建模和与本文报道的结果相似的结果可用于射电望远镜的设计以及具有活动面板的望远镜的指向和表面调整的实时控制。

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