Atkins, C;
Brzozowski, W;
Dobson, N;
Milanova, M;
Todd, S;
Pearson, D;
Bourgenot, C;
... Nistea, IT; + view all
(2019)
Lightweighting design optimisation for additively manufactured mirrors.
In:
Proceedings of SPIE - The International Society for Optical Engineering.
SPIE: San Diego, California, United States.
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Abstract
Design for additive manufacture (AM; 3D printing) is significantly different than design for subtractive machining. Although there are some limitations on the designs that can be printed, the increase in the AM design-space removes some of the existing challenges faced by the traditional lightweight mirror designs; for example, sandwich mirrors are just as easy to fabricate as open-back mirrors via AM, and they provide an improvement in structural rigidity. However, the ability to print a sandwich mirror as a single component does come with extra considerations; such as orientation upon the build plate and access to remove any temporary support material. This paper describes the iterations in optimisation applied to the lightweighting of a small, 84 mm diameter by 20 mm height, spherical concave mirror intended for CubeSat applications. The initial design, which was fabricated, is discussed in terms of the internal lightweighting design and the design constraints that were imposed by printing and post-processing. Iterations on the initial design are presented; these include the use of topology optimisation to minimise the total internal strain energy during mirror polishing and the use of lattices combined with thickness variation i.e. having a thicker lattice in strategic support locations. To assess the suitability of each design, finite element analysis is presented to quantify the print-through of the lightweighting upon the optical surface for a given mass reduction.
| Type: | Proceedings paper |
|---|---|
| Title: | Lightweighting design optimisation for additively manufactured mirrors |
| Event: | SPIE Optical Engineering + Applications |
| ISBN-13: | 9781510629257 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1117/12.2528105 |
| Publisher version: | https://doi.org/10.1117/12.2528105 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Finite element analysis, topology optimisation, additive manufacturing, 3D printing, lightweight mirrors, mirror fabrication |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10085807 |
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