Lightweight Design of Multi-Objective Topology for a Large-Aperture Space Mirror

Qu, Yanjun; Jiang, Yanru; Feng, Lai; Li, Xupeng; Liu, Bei; Wang, Wei

doi:10.3390/app8112259

Cited by 31 publications

(14 citation statements)

References 21 publications

(26 reference statements)

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“…Generally, quadrilateral holes and regular triangle holes are preferred. However, the triangle holes are the best choice, given their highest stiffness with the same weight [53,54].…”

Section: Conventional Designmentioning

confidence: 99%

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Design and Fabrication Technology of Metal Mirrors Based on Additive Manufacturing: A Review

et al. 2021

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In recent years, much progress has been made on the development of metal mirrors based on additive manufacturing (AM). The sandwich mirror is well known for its excellent mechanical properties and challenging machining. Now, AM can be used to fabricate this complex structure and reduce the processing time and cost. In addition, with the aid of some new design methods for additive manufacturing, such as lattice, topology optimization (TO), and Voronoi, the freedom of mirror structure design is enormously improved. The common materials of mirrors include ceramics (SiC), glasses (glass ceramics, fused silica), and metals (aluminum, beryllium). Among them, the AM technology of metals is the most mature and widely used. Researchers have recently extensively developed the new-generation metal mirror to improve performance and lightweight rate. This review focuses on the following topics: (1) AM technologies and powder materials for metal mirrors, (2) recent advances in optomechanical design methods for AM metal mirrors, (3) challenges faced by AM metal mirrors in fabricating, and (4) future trends in AM metal mirrors.

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“…Generally, quadrilateral holes and regular triangle holes are preferred. However, the triangle holes are the best choice, given their highest stiffness with the same weight [53,54].…”

Section: Conventional Designmentioning

confidence: 99%

“…Generally, quadrilateral holes and regular triangle holes are preferred. However, the triangle holes are the best choice, given their highest stiffness with the same weight [53,54]. Corning's researchers designed and fabricated a four-inch circular flat mirror with a honeycombed lightweight structure in 2016.…”

Section: Conventional Designmentioning

confidence: 99%

Design and Fabrication Technology of Metal Mirrors Based on Additive Manufacturing: A Review

et al. 2021

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“…The shape presented in the Mirrorcle devices is composed of radial and circular concentric beams, whereas the optimal shape to minimize thermal loading is a honeycomb structure. [32][33][34] Hermetic sealing the mirrors in a small container filled with dry, inert gas will improve a MEMS FSM's ability to dissipate heat as it will keep convective heat transfer present in the sealed environment even when the outside environment is subjected to vacuum. This approach will require an optical quality window with antireflective coating on both sides.…”

Section: Proposed Mitigation Strategymentioning

confidence: 99%

Characterization of laser thermal loading on microelectromechanical systems-based fast steering mirror in vacuum

2020

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Microelectromechanical systems (MEMS) have produced high-quality, high-bandwidth, small form factor, and inexpensive fast steering mirror (FSM) devices potentially suitable for a large variety of applications, such as image stabilization and beam pointing in satellitebased and ground-based, free-space optical communication systems. However, one outstanding question for this application is power handling. The absorption of the mirror substrate is low, but non-negligible, so the question remains of whether thermal loading from laser radiation on a MEMS mirror will deform its surface and, if so, to what extent. We show experimental results of optical performance changes due to thermal loading for MEMS two-axis FSM devices from Mirrorcle Technologies, Inc. Results and reproducible behavior are reported and compared in ambient versus vacuum conditions, where the benefits of convective cooling are absent. Finite element analyses corroborate the experimental results and show that the mirror substrate can deform due to thermal expansion imbalances. The deformation changes the focusing characteristics of the mirror, with a peak to valley defocus (second-order Zernike mode) of up to 50 nm when the mirrors are tested in ambient and up to approximately 450 nm when under vacuum. Such defocusing negatively impacts the link budget for laser-based satellite communications. © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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“…This is problematic because the PM is difficult to adjust in actual engineering. Therefore, this study uses the finite element method to analyze the surface error of the PM and attempts to use the adjustment of the SM to compensate for the primary aberration to the system caused by the PM [22][23][24][25][26].…”

Section: Compensation Of the Pm Surface Errormentioning

confidence: 99%

Precision Analysis and Error Compensation of a Telescope Truss Structure Based on Robotics

Wang

Cao

et al. 2020

Applied Sciences

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We propose a new secondary mirror support structure assisted by multi-robotics to improve the observation performance of vehicle-mobile telescope systems. A mathematical model of the displacement at the end of the robotic and the variation of telescope pitch angle is established, then the posture of the robotic is optimized by the Jacobian matrix iteration inverse kinematic problem method. Based on the new support structure, a high-order sensitivity matrix is proposed to establish the mapping relationship between the robotic misalignment and the Zernike coefficient, with the accuracy verified via the Monte Carlo method. The method of adjusting the secondary mirror to compensate the aberration caused by the primary mirror is proposed, and the relationship between the primary mirror surface error and the system error is established under different pitch angles before and after compensation. The experiment and simulation results showed that the adjustment calculated by the high-order sensitivity matrix method can effectively compensate for the misalignment caused by the robotics and the primary mirror surface error to a certain degree. After multiple iterations, the root mean square of the wavefront aberration was better than λ/15. This conclusion provides an engineering application reference value for the secondary mirror support and aberration correction technology of the vehicle telescope system.

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Lightweight Design of Multi-Objective Topology for a Large-Aperture Space Mirror

Cited by 31 publications

References 21 publications

Design and Fabrication Technology of Metal Mirrors Based on Additive Manufacturing: A Review

Design and Fabrication Technology of Metal Mirrors Based on Additive Manufacturing: A Review

Characterization of laser thermal loading on microelectromechanical systems-based fast steering mirror in vacuum

Precision Analysis and Error Compensation of a Telescope Truss Structure Based on Robotics

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