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Thermal Modeling of the TMT Telescope

机译:TMT望远镜的热模型

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摘要

Thermal modeling of the Thirty Meter Telescope (TMT) was conducted for evaluations of thermal performances by finite element (FE) and optical analysis tools. The thermal FE models consist of the telescope optical assembly systems, instruments, laser facility, control and electronic equipments, and telescope structural members. A three-consecutive-day thermal environment data was implemented for the thermal boundary created by Computational Fluid Dynamics (CFD) based on the environment conditions of the TMT site. Temporal and spatial temperature distributions of the optical assembly systems and the telescope structure were calculated under the environmental thermal conditions including air convections, conductions, heat flux loadings, and radiations. With the calculated temperature distributions, the thermo-elastic analysis was performed to predict thermal deformations of the telescope structure and the optical systems. The line of sight calculation was made using the thermally induced deformations of the optics and structures. Merit function routines (MFR) were utilized to calculate the Optical Path Difference (OPD) maps after repositioning the optics based on a best fit of M1 segment deformations. The goal of this thermal modeling is to integrate the mechanical and optical deformations in order to simulate the thermal effects with the TMT site environment data from CFD.
机译:进行了三十米望远镜(TMT)的热建模,以通过有限元(FE)和光学分析工具评估热性能。热有限元模型包括望远镜光学组件系统,仪器,激光设备,控制和电子设备以及望远镜结构构件。根据TMT站点的环境条件,对计算流体动力学(CFD)创建的热边界实施了连续三天的热环境数据。在包括空气对流,传导,热通量负荷和辐射在内的环境热条件下,计算了光学组件系统和望远镜结构的时空温度分布。利用计算出的温度分布,进行热弹性分析以预测望远镜结构和光学系统的热变形。视线的计算是使用光学和结构的热诱导变形进行的。优点函数例程(MFR)用于根据M1片段变形的最佳拟合在重新定位光学系统后计算光程差(OPD)映射。该热模型的目的是整合机械和光学变形,以便利用CFD的TMT现场环境数据模拟热效应。

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