A method on lightweight for the primary mirror of large space-based telescope based on neural network

Dawei Wang; Shuqing Zhang; Fanjiao Tan; Xiyang Zhi; Yongqiang Chu; Hongdi Lv; Rongkai Zhen

doi:10.1117/12.2072472

18 November 2014 A method on lightweight for the primary mirror of large space-based telescope based on neural network

Dawei Wang, Shuqing Zhang, Fanjiao Tan, Xiyang Zhi, Yongqiang Chu, Hongdi Lv, Rongkai Zhen

Proceedings Volume 9298, International Symposium on Optoelectronic Technology and Application 2014: Imaging Spectroscopy; and Telescopes and Large Optics; 92981J (2014) https://doi.org/10.1117/12.2072472
Event: International Symposium on Optoelectronic Technology and Application 2014, 2014, Beijing, China

Abstract

With the aperture of telescope becoming larger, the mass of primary mirror and other relevant structures will become heavier as well. Therefore, lighting weight for large space-based telescope is necessary. This paper purposed a method based on Neural Network aims to build a math model for primary mirror of large space-based telescope, which can reduce weight of the telescope and smaller mirror deformation caused by gravity release effectively. In the meantime, it can also improve stiffness of structure and reduce thermal strain caused by on orbit temperature variation effectively. The model describes the relationship between the structure of primary mirror of large space-based telescope and corresponding deformation, and describes the optical performance of mirror by using Zernike Polynomial. To optimize the structure of primary mirror lightweight, we take the deformation of mirror and its optical performance into consideration. To apply the structures parameters and its corresponding deformations to Neural Network training, we use the combination samples of different mirror lightweight structure parameters and corresponding deformation which caused by gravity release and thermal condition. Finally, by taking advantage of the Neural Network model to optimize the primary mirror lightweight of 1-meter rectangle space-based telescope, which can make the RMS 0.024λ (λ=632.8nm)and areal density under 15kg/m². This method combines existing results and numerical simulation to establish numerical model based on Neural Network method. Research results can be applied to same processes of designing, analyzing, and processing of large space-based telescope directly.

Citation Download Citation

Dawei Wang, Shuqing Zhang, Fanjiao Tan, Xiyang Zhi, Yongqiang Chu, Hongdi Lv, and Rongkai Zhen "A method on lightweight for the primary mirror of large space-based telescope based on neural network", Proc. SPIE 9298, International Symposium on Optoelectronic Technology and Application 2014: Imaging Spectroscopy; and Telescopes and Large Optics, 92981J (18 November 2014); https://doi.org/10.1117/12.2072472

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