mon. 20 october 2003 so/eus proto-consortium meeting mechanical design dr douglas griffin 1 solar...

Mon. 20 October 2003SO/EUS Proto-consortium Meeting

Mechanical DesignDr Douglas Griffin

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Solar OrbiterExtreme Ultaviolet Spectrometer

Conceptual Mechanical Design Layout

Dr Douglas Griffin

http://www.sstd.rl.ac.uk/



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Principal Requirements

• Withstand launch loads

• Maintain optical alignment

• Withstand thermal environment

• Meet mass budgets




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Material Selection

CeSiC Carbon Fibre Be Invar Al - 6061 T6

Density (kg/m3) 2650 1550 1840 8050 2710Youngs Modulus (GPa) 250 130 303 141 71

Strength (MPa) 140 3000 217 448 275CTE (me/K) 2.3 0.2 11.5 1.3 23.9

Thermal Conductivity (W/m/K) 125 5 216 10.15 167

Creep

Moisture sensitivity

Outgassing properties

Maximum working temperature

CTE Compatibility with other materials

Radiation harness

Degradation




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CeSiC Manufacturing

• Felt of randomly orientated Carbon Fibres

• Impregnated with Phenolic resin and moulded into a blank at high pressure

• Vacuum heated to 1000ºC to pyrolize non-carbon components

• Reheated to 2100ºC to turn blank into graphite to produce the green body

• The green body is machined to the desired shape– Stiffening ribs– 1mm wall thicknesses

• Green bodies glued together with Phenolic resin to form a larger composite green body

• Green body is infiltrated with molten Silicon at 1600ºC and furnace cooled

• Resulting structure is monolithic and isotropic

• Feature tolerances ± 10 mm

• Can be EDM machined after structure has been manufactured




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SO/EUS Structural Concept

S/C Sunshield

S/C Bus

EUS




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S/C I/F (Thermal and Structural Isolation)No pointing !

Primary Radiator c/w Heat pipe condenser

EUS Aperture

Detector radiator




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Cross braces for torsional stiffness

Thin panels with stiffening ribs

Heat pipe flexible link




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SO/EUS Structural ConceptDetectors + Electronics

M1

Slit Assembly

Heat Shield

Grating




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Detectors + Electronics

Beams up to the slit

Slit Assembly

Grating




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SO/EUS M1 Structural ConceptM1 Heat pipe Evaporator

Thermally isolating actuated mounts Cold plate (Aluminium)

Cold fingers




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SO/EUS Slit

Heat interceptor

Slit mount

Beams from M1

Incident beams




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Future work• Trade-off studies

– Materials – Layouts

• Requirements


mon. 20 october 2003 so/eus proto-consortium meeting mechanical design dr douglas griffin 1 solar...

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