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Enhancing TOU Mechanical Design: Insights from Catania Astronomy Workshop

This document presents an overview of the TOU Mechanical Design discussions held at the Astronomical Observatory in Catania on June 11, 2014. Key aspects include design architecture, material selection, and future activity planning. It outlines investigations into L6 failure modes, consolidation of architecture for improved interfaces, and ongoing modeling activities using FEM and TMM methods. Emphasis is placed on prototyping efforts to enhance lens mounts. Due to current resource constraints, a phased approach to support PLATO development is suggested.

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Enhancing TOU Mechanical Design: Insights from Catania Astronomy Workshop

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  1. PLATO - TOUMechanical Design&Future Activities Osservatorio Astronomico – Catania June 11th, 2014

  2. Overview • TOU Mechanical Design Overview • Architecture • Materials • Future Activities • L6 failure: Investigation & design improvement • Architecture consolidation: FPA interface, integration, baffle, … • Modelling activities (FEM & TMM) • Prototype lens mounts • Resources Availability

  3. TOU Mechanical Design (1) The TOU consists of: • Structural tube • Machined AlBeMeT part (outstanding combination of properties) • Outside gold coated to minimize radiative coupling • Inside black coated to optimize straylight behavior • Thermal connection between FPA and baffle (which acts as radiator) • Lens mounts and interface parts • Multi-finger design to minimize bonding surface and provide isostaticity to the lenses • Materials choice to match the glasses CTE • Isostatic interface to tube to compensate for CTE mismatch • Isostatic mounts to the S/C optical bench • 3-points interface to allow alignment by shimming

  4. TOU Mechanical Design (2)

  5. Materials • Material choice drivers • Main Structure: combination of properties (, CTE, Cp, E) • Lens Mounts: Minimization of thermo-elastic stresses in the lenses (CTE, E)

  6. Future Activities

  7. L6 failure:Investigation & design improvement • During the DM campaign cracks were observed at the four bonded interfaces of L6. • The failure is reproducibele, therefore workmanship can be excluded. • The root cause nees to be identified. • A plausible hypotesis is an excessive bonding area, which leads to high thermo-elastic stresses in the glass. • The flexibility of the mount has to be verified • Breadboards will be used to prove the improvements implemented.

  8. Architecture Consolidation The following points will be investigated to update and improve the design: • FPA interface • The last FPA developments were not considered. • Optics integration • Accessibility, fixation points of dedicated tooling, ... • Baffle interface • Requiements consolidation for the interface to the S/C OB. • Handling interfaces for integration at S/C level.

  9. Modelling activities (FEM & TMM) • Currently, at UBE there is a strong team capable of performing mechanical and thermal modelling. • NASTRAN, ESARAD, SYSTEMA available. • Performing FEM and TMM at the same location allows a more efficient and fast optimization of the overall design. • Such activities will be included in our PRODEX proposal.

  10. Prototyping • UBE is ready to support prototyping activities, e.g. lens mounts with improved design and/or alternative materials. • Small scale BB are, as well, foreseen to verify envisaged design improvements.

  11. Short-Term Planning & Resurces • Due to the very high work loat at UBE it is not possible to allocate full time personnel to PLATO right now. • To support PDCR (mid March 2015) some resources will be made available. In particular FEM/TMM. • In the second quarter of 2015 experienced personnel will be available for PLATO.

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