Design and Development process on CAD
Starting from the 3D geometry of the spacecraft or instrument the 3D model delivered by the customer will be covered by a pattern of MLI according to the specific project requirements. This pattern of MLI blankets will be designed for minimization of mass, safe overlapping of blankets, minimization of thermal leaks, minimization of material waste, adequate fixation to structure, possibility of late access to required areas, simple integration of blankets and fixation of attachment and grounding.
RUAG Space will produce a General Arrangement Drawing which is the central RAA document for communicating interfaces with the customer.
These CAD-drawings will show the positions and contours of all RAA deliverable hardware (in scale but without dimensioning). This includes all MLI and attachment hardware. The geometry of the spacecraft is included as reference, as well as the spacecraft coordinate axes. Relevant hardware with interface to MLI (e.g. GSE) and items to which access (e.g. pyros) or direct view (e.g. alignment cubes) are required, are also indicated. The MLI part numbers are shown, as well as the overlap sequence of MLI and foils.
In parallel with this Assembly Drawing the attachment bonding templates will be established.
The following details will be present on each template within the blanket contour:
- Lay-up code
- Position of folding lines, cuts, slits as far as relevant for manufacturing
- If cuts and slits only apply for a part of the layers of the blanket package, then the number of layers is indicated.
- Main or local co-ordinate axis
- Contour of a part of the spacecraft
- Position of name plate, grounding points, fixation points
- Name of the spacecraft
- Name of the blanket/foil
- Drawing number, Issue number of the template
- Any additional design detail necessary for manufacturing of the blanket according to the requirements
For design reviews or on request CAD models of the Thermal Control Hardware (including attachment hardware) will be uploaded for inclusion into higher level spacecraft models and subsequent interface checks.