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Topology Optimization of a Single-Point Diamond-Turning Fixture for a Deployable Primary Mirror Telescope

Bourgenot, Cyril; Krumins, Valdis; Bramall, David G.; Haque, Abdul M.

Topology Optimization of a Single-Point Diamond-Turning Fixture for a Deployable Primary Mirror Telescope Thumbnail


Valdis Krumins

Abdul M. Haque


Pierre Rochus


CubeSats, known for their compact size and cost effectiveness, have gained significant popularity. However, their limited size imposes restrictions on the optical aperture and, consequently, the Ground Resolution Distance in Earth Observation missions. To overcome this limitation, the concept of deployable optical payloads with segmented primary mirrors which can unfold like petals has emerged, enabling larger synthetic apertures and enhanced spatial resolution. This study explores the potential benefits of leveraging Additive Manufacturing (AM) and Topology Optimization (TO) in the realm of ultra-precision machining, specifically single-point diamond machining. The goal is to reduce fixture weight while improving stiffness to minimize deformations caused by rotational and cutting forces which compromise optical performance. Through Finite Element Analysis, this research compares conventionally machined fixtures with those produced using AM and TO techniques. The results reveal that concept designs created via TO can achieve a remarkable 68% reduction in weight. This reduction makes the assembly, including the machining fixture and 12 U deployable segments, manageable by a single operator without the need for specialized lifting equipment. Moreover, these innovative designs lead to substantial reductions of up to 86% and 51% in deformation induced by rotational and cutting forces, respectively.

Journal Article Type Article
Acceptance Date Jan 2, 2024
Online Publication Date Jan 4, 2024
Publication Date Jan 4, 2024
Deposit Date Mar 20, 2024
Publicly Available Date Mar 21, 2024
Journal Aerospace
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 11
Issue 1
Article Number 50
Keywords single-point diamond machining, topology optimization, earth observation, CubeSat, deployable optics, lightweight, additive manufacturing
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