Presentazione di PowerPoint

1
STAR TRACKER
TRD
M-Structure
VC Conical Flange
Upper ToF
TTCS
Si Tracker Conical Flange
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AMICA STAR TRACKER SUPPORT
ASTB Baffle
ASTBS Baffle Support
ASTSU Support Upper
ASTCamera Lens Electronics (inside)
ASTSL Support Lower
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ASTCamera
Objective Rodagon 75mm f/1.25 lens
CCD boards
Connector 25 pin Glenair, MWDM-2-L-25-S-24-J-X-
P
AST Camera
Electronic Board
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ASTCamera Vs Tracker
Lens
x -1001mm y 20mm z 734mm ASTC1 x
1001mm y -20mm z 734mm ASTC2 Elevation
50 deg (Rotation wrt AMS y axis) Azimuth 35
deg (Rotation wrt AMS z axis)
CCD boards
Plane1
Plane 1
TTCS
Si TRACKER
Conical Flange
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AST Thermal
CCD 0.2Watt
CCD1 0.5Watt
EL BOARD 3 Watt
Thermal bridge copper strip
TTCS
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AST Support Upper
Fixation to tracker
ASTS Upper - CFRP quasi-isotropic
(0/45/90/-45)3S - Ply t0.125mm Laminate
t3mm - M55J fiber \ ACLTM 110 Cyanate ester
resin - non structural woven ply Toray T300 -
EMI Loctite SynSkin9837.1LS /Astrostrike screen
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AST Support Lower
ASTS Lower - CFRP quasi-isotropic
(0/45/90/-45)3S - Ply t0.125mm Laminate
t3/4mm - M55J fiber \ ACLTM 110 Cyanate ester
resin - non structural woven ply Toray T300
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ASTS FEA Composite Material
PLY UHM CFRP UNIDIRECTIONAL PREPREGS
M55J/Cyanate ester resin t
0.125mm
Space qualified UNIDIRECTIONAL CFRP
LAMINATE QUASI_ISOTROPIC (0/45/90/-45)3s
t3mm CTExy 0 C-1
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ASTS Margin of Safety
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Modal Analysis 1st MODE 82 Hz
Modal Analysis 2nd MODE 177 Hz
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Upper ToF
Vacuum Case
Vs VC
Vs UToF
Vs SiT
ASTS DESIGN VALIDATION Design, material list,
screw list, circulated among Lockheed,
AMS_Integration, close Subdetectors
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Star Tracker Qualification Module status
ASTS Structure Test Article
completed
Production drawings
Production process set-up
Composite prepreg procurement
Molds production
running
Composite Lamination
Inserts, washers, collar production
foreseen
STA ready 1st week of May
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Star Tracker Qualification Module status
Electronics qualification module
CARSO
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Star Tracker Qualification Module test
Validation of
Assembly
AST Camera assembly
AST Thermal Circuit assembly
Si Tracker assembly
Thermal behaviour Thermal vacuum test
Structural behaviour Vibration test
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AST Baffle Vs TRD
TRD-M Structure
BAFFLE
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Baffle Bracket
n.6 NAS1351-3-12 A286 .190-32 thread
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Baffle Bracket Baffle side
NAS1351-4-16 A286 .19 32 thread
Al7075 T7351
t 4mm
Set-pin sliding direction
Support rings
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Baffle Bracket M-structure side
NAS1351-4-16 A286 .250-28 thread
t 3mm
t 5mm
t 4mm
t 4mm
NAS1351-3-12 A286 .190-32 thread
Al7075 T7351
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Baffle Brackets B and M
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Baffle Support Position Accuracy
14mm
10mm
Baffle will be assembled with reference to the
objective in order to preserve Baffle/Objective
nominal gap
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AST Baffle Support Position Accuracy
Fixed to M-structure
Assembly tolerances
Fixed to Tracker
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AST Baffle Support Position Accuracy
Fixed to M-structure
Washers shim the gap
Fixed to Tracker
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AST Baffle Support thermal decoupling
3rd interface
2nd interface
1st interface
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AST Baffle Support thermal decoupling
UPPER CONNECTION
End isolator
Center isolator
End isolator
End isolator
Ti bush
LOWER CONNECTION two set pins leave the
possibility to the baffle to thermally deform in
the axial direction without inducing stress
Ti set-pin
Set-pin sliding direction
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Goal GL(Baffle-Mstructure)0.01?0.1W/K
M-structure 0.3? 4C local gradient
Actual conductance will be experimentally
evaluated
G2
Gtotal Gthrough bolt G1
End isolator
G1
G3
Center isolator
End isolator
G4
Isolation is foreseen both between the components
being bolted together and under the bolt head and
nut to avoid a thermal short through the
bolt. The isolator should have a lip to prevent
the bolt from shifting under launch vibration The
resistance down the bolt can be increased by
using titanium bolt
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MLI ID7 cut to house baffle bracket
Baffle Bracket
MLI tongue
Vertical cuts
Horizontal cuts
A rectangular slot is cut in MLI ID 7 leaving one
side of the rectangle uncut so to produce tongue
in the MLI ID 7 The MLI tongue is inserted
between Baffle bridge bracket ( gap about 25
mm). The MLI vertical cuts are restitched
together. The horizontal cuts are fixed to the
baffle rings
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MLI ID1 Vs Star Tracker
MLI ID1
Baffle/MLI ring
MLI Collar 1
MLI Collar 2
MLI ID1
Lens Collar (fixes the lens to the structure)
MLI ID1 has a circular hole that let the lens
come out An additional piece of MLI surrounds
the periphery of the lens and is fixed from one
side to the baffle by connecting the MLI Collar1
to a devoted ring on the baffle baffle/MLI ring
on the other side by connecting the MLI Collar2
to the Lens Collar and fixing in between the
MLIID1
(Distance between Baffle/MLI ring and Lens Collar
64.5mm)
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AST Baffle Support Structural Analysis running
PARALLEL ANALISYS TRD group
impact on M-structure STAR TRACKER group
local detailed analysis
Baffle_Al6061
Baffle Bracket _Al7075 T7351
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AST Baffle Support Structural Analysis Max stress
Von Mises 182 MPa
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AST Baffle Support BOLTS Analysis
Max Loaded bolt at interface with
M-Structure MoS0.652
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AST Baffle Support BOLTS Fail
Safe Analysis
bolt removed
New max loaded bolt MoS0.823
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AST Baffle Support Fail Safe Analysis
bolt removed
Max stress _at_ bracket
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AST Baffle Support Thermo-elastic Analysis
105 MPa
Assumption
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AST Baffle Support Thermo-elastic Analysis
Displacement
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AST Baffle Support Thermo-elastic Analysis Stress
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AST Baffle Support Modal Analysis 1st MODE
68.6 Hz
50.5Hz for K1200N/mm at M-structure bolts
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AST Baffle Support Modal Analysis 2nd MODE
103.26 Hz
65.5Hz for K1200N/mm at M-structure bolts
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AST Baffle Support Modal Analysis 3rd MODE
223.08 Hz
101Hz for K1200N/mm at M-structure bolts
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STAR TRACKER
CONCLUSION
ASTS Structure Test Article ready 1st week of May
CAMERA assembly into ASTS
BAFFLE BRACKET design approval, production
SPACE QUALIFICATION TEST