Transcript Section 2.2 - Budgets Metrics

GLAST LAT Project
Gamma-ray Large
Area Space
Telescope
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
GLAST Large Area Telescope:
Mechanical Systems Peer Review
March 27, 2003
Section 2.2 – Budgets & Metrics
Leonard Lee
SLAC
Systems Engineer
[email protected]
Document: LAT-PR-0XXXX
Section 2.2 Budgets & Metrics
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Topics
Agenda
• Allocated budgets (mass, c.g.,power)
• Drawing and Procedure Metrics
– Mechanical Subsystem drawing tree
– Status of major assemblies, critical component drawings,
and procedures
– Document status
Document: LAT-PR-0XXXX
Section 2.2 Budgets & Metrics
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
LAT Metrics: Allocated Mass Budget
March 2003
Mass (kg)
Estimate
TKR
504.9
CAL
1375.8
ACD
270.1
Mech
329.3
Elec
199.3
LAT Total
2679.4
Rsrv/Margin
320.6
Rsrv/Margin* 12.0%
Allocation
Alloc.
510.0
1440.0
280.0
345.0
220.0
2795.0
Mass Estimate Breakdown
Parametric
Calculated
Measured
Total
(kg)
382.3
975.8
1321.3
2679.4
%
14.3%
36.4%
49.3%
100%
3000.0
* AIAA G-020 recommended min reserve = 7.2%
3000
LAT Margin
Second Moment of Inertia (kg-m2)
Ixx
1057.7
1500.0
Iyy
1014.9
1500.0
Izz
1339.5
2000.0
5.4%
I-PSR
dPDR
10.9%
I-CDR
LAT Reserve
2800
Mass (kg)
Center of Mass (mm)
CMx
1.26 -20 < CMx < 20
CMy
-0.54 -20 < CMy < 20
CMz
-86.89 CMz < -51.2
Ht off LIP
149.31
Ht < 185
2900
I-PDR
Subsystem Allocation
2700
2600
Prop
I-SRR
Mass Budget
2500
Review Threshold
Total Allocated to S.S.
2400
Oc
t -9
9
Ja
n- 0
0
Ap
r- 0
0
Ju
l-0
0
Oc
t -0
Ja 0
n- 0
1
Ap
r- 0
1
Ju
l-0
1
Oc
t -0
Ja 1
n- 0
2
Ap
r- 0
2
Ju
l-0
2
Oc
t -0
2
Ja
n- 0
Ap 3
r- 0
3
Ju
l-0
3
Oc
t -0
3
Ja
n- 0
4
Ap
r- 0
4
Ju
l-0
4
Oc
t -0
4
Ja
n- 0
5
Ap
r- 0
5
LAT Mass Estimate
Date
Document: LAT-PR-0XXXX
Section 2.2 Budgets & Metrics
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Mechanical Subsystem Mass Budget
Subsystem Mass Status
Subsystem Mass Estimates (kg)
Subsystem
TKR
CAL
ACD
Mech
DAQ Elec
LAT Total
% of Total
Current
Alloc.
510.0
1440.0
280.0
345.0
220.0
2795.0
PARA
CALC
MEAS
Total
0.0
53.0
35.5
143.2
150.6
382.3
14.3%
504.9
26.5
209.6
186.0
48.7
975.8
36.4%
0.0
1296.3
25.1
0.0
0.0
1321.3
49.3%
504.9
1375.8
270.1
329.3
199.3
2679.4
100.0%
"Current" Allocations per CCB action on 7 Mar 03
Document: LAT-PR-0XXXX
Section 2.2 Budgets & Metrics
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Mechanical Systems Power Budget
Condition
LAT “On”
Power Mode
Allocation
Radiator VCHP Heater Power
<48 watts
Mechanical Systems Power”On”= 48 watts
Survival Heater Peak Power
LAT “Off”
Orbit-Average Survival
Heater Power
Orbit-Average Survival
Heater Power
<350 watts
<300 watts@27 Volts
min
<350 watts@29 Volts
max
Mechanical Systems Power”Off”= 300-350 watts(27-29 volts)
Document: LAT-PR-0XXXX
Section 2.2 Budgets & Metrics
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Drawing Tree
Mechanical Systems Drawing Tree
1
Grid Box Assy
M
Connector Panel
TCS External Box
M
TCS Connector
Support Bracket
2
EMI Shield
Details
(4 drawings)
X-LAT Plate Assy
Mid-Plate Assy
SCD
SCD
External Box
Base
LH & RH Down
Spout Heat Pipe
SCD
External Box
Cover
LH & RH Heat
Pipe Patch Panel
Grid Box Base
Assy
M
Grid Assy
Top Flange Heat
Pipe
SCD
Purge Groove
Cap
4 x 4 Grid
LH & RH
Radiator Mount
Bracket
Spacecraft
Interface Stiffener
(Wing)
Thermistors
NOTES:
1. Grid Box Assy is for Mechanical Systems Testing only.
2. Grid Box Base Assy is delivered to I&T for LAT integration
along with all of the uninstalled Grid Box Assy parts.
3. Wing may become integral part of 4x4 Grid.
Flight Heaters
SCD
Grid Schematic
M = Make
B = Buy
SCD = Source Control Drawing
Document: LAT-PR-0XXXX
SCD
M
B
SCD
Section 2.2 Budgets & Metrics
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Status of major assemblies, critical
component drawings, and procedures
QTY
1
2
1
1
1
2
4
8
2
1
1
1
6
6
2
2
5
2
8
x
x
1
1
2
2
4
Drawing Number
LAT -DS-01581
LAT -DS-01247
LAT -DS-01257
LAT -DS-01261
LAT -DS-01262
LAT -DS-01263
LAT -DS-01258
LAT -DS-01264
LAT -DS-01580
LAT -DS-01391
LAT -DS-01292
LAT -DS-01259
LAT -DS-01260
LAT -DS-01393
LAT -DS-01268
LAT -DS-01267
LAT -DS-01579
LAT -DS-01265
LAT -DS-01266
Drawing Title
Grid Box Assembly Drawing
X-LAT Plate SCD
Mid-plate SCD
Left Hand + X EMI Shield
Left Hand -X EMI Shield
Right Hand +/- X EMI Shield
Center EMI-Shield
Connector Plate
TCS Connector Support Bracket
TCS External Box
External Box Base
External Box Cover
Grid Box Base Assembly Drawing
Right Hand Down Spout Heat Pipe SCD
Left Hand Down Spout Heat Pipe SCD
Left Hand HP Patch Panel
Right Hand HP Patch Panel
Top Flange Heat Pipe SCD
Purge Groove Cover Plate #1
Grid Heater
Grid Cable Routing Drawing
Grid Schematic
Grid Assembly
4 x 4 Grid Machining
Left Hand Radiator Mount Bracket
Right Hand Radiator Mount Bracket
Spacecraft Interface Stiffener (Wing)
Drawn By
JS
CW
CW
CW
CW
CW
DP
DP
JS
JS
JS
DP
DP
JS
JS
Released
X
X
X
X
X
X
X
X
X
X
JS
JS
DP
DP
Total Drawings =
Document: LAT-PR-0XXXX
DRAWING STATUS
Not Started
Draft Check
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
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Section 2.2 Budgets & Metrics
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
Document Status
Document Title
Document Number
Author
Not Started
Fabrication Plan
4 x 4 Grid Fabrication Plan
Assembly Plan
Riadiator Process Plan
Heat Pipe Process Plan
X-LAT/Mid-Plate Process Plan
LAT -DS-xxxxx
LAT -DS-xxxxx
LAT-DS-xxxx
LAT -DS-xxxxx
LAT -DS-xxxxx
LAT -DS-xxxxx
SLAC
Sub
SLAC
LM
LM
LM
X
Mechanical Systems Test Plan
Grid Box Assembly Test Plan
4 x 4 Grid Test Plan
Radiator Test Plan
Heat Pipe Test Plan
X-LAT/Mid-Plate Test Plan
TCS Test Plan
LAT-SS-00493
LAT -DS-01317-01
LAT -DS-01316-01
LAT -DS-xxxxx
LAT -DS-xxxxx
LAT -DS-xxxxx
LAT -DS-xxxxx
SLAC
SLAC
SLAC
LM
LM
LM
LM
Grid Box Assembly Test Procedure
4 x 4 Grid Test Procedures
LAT -DS-xxxxx
LAT -DS-xxxxx
SLAC
SLAC
TOTAL DOCUMENTS
Document: LAT-PR-0XXXX
Draft
Check
Released
0
0
X
X
X
X
X
X
X
X
X
X
X
X
X
X
10
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Section 2.2 Budgets & Metrics
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GLAST LAT Project
DOE/NASA Mechanical Systems Peer Review, March 27, 2003
End of
Section 2.2
Document: LAT-PR-0XXXX
Section 2.2 Budgets & Metrics
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