Dynamic analysis of TMT
Dynamic analysis of TMT
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DOI：
10.1117/12.786935
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发表时间：
2008-07
期刊：
影响因子：
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通讯作者：
D. MacMynowski;C. Blaurock;G. Angeli
中科院分区：
文献类型：
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作者：
D. MacMynowski;C. Blaurock;G. Angeli
影响三十米望远镜（TMT）光学性能的动力干扰源包括：直接作用于望远镜结构的天文台外壳内部的非定常风力、作用于外壳本身并通过土壤和桥墩传递给望远镜的非定常风力、作用于望远镜本身（如仪器冷却）或通过土壤和桥墩传递给望远镜的设备振动，以及潜在的声学力。我们通过现有观测站的数据进行建模来估计这些干扰源的特征。通过土壤和桥墩分别对外壳或支撑建筑物上的力传播到望远镜基座进行建模，从而得出望远镜桥墩处的力估计。我们使用包括望远镜结构动力学、控制系统和线性光学模型在内的集成建模来分析由此产生的光学后果。动态性能以概率分布的形式给出，其中包括外部风速和观测方向相对于风的变化，然后可以将其与圆顶观测和其他与时间或方向相关的总体误差预算相结合。该模型预测了TMT可接受的动态性能。
Dynamic disturbance sources affecting the optical performance of the Thirty Meter Telescope (TMT) include unsteady wind forces inside the observatory enclosure acting directly on the telescope structure, unsteady wind forces acting on the enclosure itself and transmitted through the soil and pier to the telescope, equipment vibration either on the telescope itself (e.g. cooling of instruments) or transmitted through the soil and pier, and potentially acoustic forces. We estimate the characteristics of these disturbance sources using modeling anchored through data from existing observatories. Propagation of forces on the enclosure or in support buildings through the soil and pier to the telescope base are modeled separately, resulting in force estimates at the telescope pier. We analyze the resulting optical consequences using integrated modeling that includes the telescope structural dynamics, control systems, and a linear optical model. The dynamic performance is given as a probability distribution that includes the variation of the external wind speed and observing orientation with respect to the wind, which can then be combined with dome seeing and other time- or orientation-dependent components of the overall error budget. The modeling predicts acceptable dynamic performance of TMT.