Transcript ppt

GLAST LAT Project
3-4 May 2005
LAT Environmental Test Planning and Design Review
3-4 May 2005
Thermal-Vacuum Test Configuration
Martin Nordby
LAT Environmental Test PDR
Mike Foss
Rich Bielawski
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GLAST LAT Project
3-4 May 2005
Test Configuration Assembly
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LAT is supported off of TIP and Test Stand
during T-Vac testing
– Lower Extension Beams serve as feet
for supporting cantilevered load
– Support does not require a momentbearing connection to the T-Vac trolley
– Upper Extension Beams are used to
hoist the LAT on the trolley, then are
removed
SC simulator sink plates fit
– Top deck sink plate slips between XLAT Plate and TIP
– Y-side simulators slide between inside
of Radiators and Test Stand
– Both are support off the TIP/Test Stand
Sink Plates and infrared heater cages are
mounted around the outside of the LAT after
it is on the trolley
– These could mount to the Test Stand or
be free standing
All thermal STE relies on radiative cooling
from the chamber cold shrouds
Test Stand has been designed to
provide clearance for STE sink
plates
Radiators mount to the LAT
prior to rolling over
Lower Extension Beam
LAT on Test Stand
in T-Vac Configuration
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
Test Configuration in the Thermal-Vacuum Chamber
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LAT rolls into the chamber on a table
– Table rolls on V-groove casters off
a trolley on the floor of the
building
– Issues being addressed
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Chamber table rolls LAT
into position on rails from
trolley outside
Load rating of table and rails
Load rating of trolley
Preferred method to roll LAT into
chamber and control motion
Confirm LAT height with respect
to building beam outside chamber
Orientation of the LAT in the chamber
has not been finalized
– Radiators-first (as shown): allows
easy access around ACD to
integrate sink panel
– ACD-first: provides clear access
to route cable and add MLI
blankets  this is the likely one
Port plates for LAT
feedthroughs
LAT in “Big Blue” chamber
LAT Environmental Test PDR
View from Door Opening
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GLAST LAT Project
3-4 May 2005
MGSE/STE for Thermal-Vacuum Testing
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The table below lists all known mechanical
and thermal MGSE/STE needed for T-Vac
testing
– Still missing MGSE MLI blankets 
once flight design is finalized, test
blanket design will lay out quickly
– Does not include equipment to move
LAT or rigging  being worked as part
of facility support
MGSE Assembly
Test Interface Plate Ass'y
Dust Tent
Test Stand
Extension Beams
Spreader Bars
Radiator SC Strut sims
Radiator heater frame
ACD sink plates
ACD sink plate support frame
SC Simulator sink plates
Top deck sink plate
Chill Bars and Aux. Cooling
Use / Comments
Mounts LAT to slip table/expander head
Covers LAT in un-regulated environment
Supports LAT in T-Vac Chamber
Used for turn-over and horiz lift/support
Used for turn-over
Simulates SC support struts for Radiators
Supports cartridge heaters for Rad sinks
Provides equiv sink env for ACD sides
Supports ACD sink plates
Provides equiv sink env for Rad backsides
Provides eqiv sink env for X-LAT Plate
Cool LAT for pre-/post-test CPT's
Trolley for moving LAT
and rolling it into chamber
Concept for sink plates
and support frame
LAT in T-Vac Chamber
List of MGSE/STE Needed for T-Vac Testing
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
MGSE Requirements Flowing from Thermal-Vacuum Testing
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Test Interface Plate
– Accommodates installation of a SC top deck sink plate between TIP and X-LAT Plate
– Handle LAT loads when horizontal, plus thermal stresses due to temp variations
Test Stand with Extension Beams
– Supports LAT in horizontal configuration during hoisting, transport, and on T-Vac trolley
– Capable of leveling the LAT to an accuracy of 0.1 degrees in both principal axes
– Functions over temp range of –TBD to +TBD degC while maintaining angular stability of
LAT to within +/- 0.1 degrees
– Extension Beams compatible with T-Vac trolley mounting and floor loading capabilities
– Includes active heating to stabilize average temps
– Accommodates installation of, and supports SC simulator sink plates between Test Stand
and back side of Radiators
– Design and construction compatible with cleanliness needed for T-Vac
Spreader Bars
– Each bar designed to carry entire load of LAT in T-Vac configuration
– Two spreader bars are identical and interchangeable
– Capable of lifting LAT in vertical or horizontal configuration
– Capable of rotating LAT 90 degrees using only two crane hooks
SC Strut Simulators
– Provide flight-like interface and load paths to simulate SC struts that support Radiators
– Interface with Radiator at flight interface, and with Test Stand
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
MGSE Requirements Flowing from Thermal-Vacuum Testing (cont. 1)
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Dust Tent
– Capable of providing clean, dry environment before and after T-Vac testing
– Designed to be dis-/re-assembled around tipped-over LAT inside T-Vac chamber
Chill Bars and Auxiliary Cooling
– Designed to be dis-/re-assembled from Grid wing before/after T-Vac test to support opendoor CPT testing in air
– X-LAT auxiliary cooling lines designed to be blown clean prior to T-Vac to prevent
unnecessary offgassing of remaining working fluid
– Working fluid should not be a contaminant for T-Vac (otherwise X-LAT aux cooling lines
will need to be capped)
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
STE Requirements Flowing from Thermal-Vacuum Testing (cont. 2)
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ACD Equivalent Sink Plates
– 3 plates independently heated to provide equivalent sink temp for +Z, +X, and -X ACD
faces
– Passively cooled by large view factor to cold shroud (including underside plate):
requires high-emissivity surfaces and over-sized geometry to achieve adequate VF
– Low mass to speed heating/cooling rates
– Capable of accommodating thermal stresses due to internal temp gradients and
externally-imposed loads from support frame
ACD Sink Plate Support Frame
– Support ACD sink plates
– Provide thermal isolation of sink plates from each other and from support structure
– Minimize thermally-induced loads applied to sink plates due to differential temps between
frame and plates
– Open frame to maximize view of sink plates to shroud
– Designed to function at shroud temperature
SC and Top Deck Simulator Sink Plates
– Capable of being installed around LAT/Radiator/TIP/Test Stand assembling without any
de-integration of hardware (likely requires that sink plates come in multiple pieces)
– Passively cooled by view factors to cold shroud: requires high-emissivity surfaces and
over-sized geometry to achieve adequate VF
– Each of the 3 plates is thermally isolated from its neighbor and the Test Stand
– Each of the 3 plates is actively heated on an independent heater circuit
– Low mass to speed heating/cooling rates
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
STE Requirements Flowing from Thermal-Vacuum Testing (cont. 3)
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Radiator and ACD Y-Side Heaters
– Cartridge heaters are small to reduce view factor from Radiators
– Heaters are low mass to speed heating/cooling rates
– High emissivity surfaces
Heater Cages
– Supports cartridge heaters
– Thermally isolates heaters
– Accommodates large temp range of heaters
– Capable of functioning down to shroud temperature
– Provides blinders, baffles, and MLI blanketing to block view of heaters to other sink
plates and thermal surfaces
– Self-supporting off trolley floor
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
STE Heating and Cooling
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•ACD -X
•ACD +Z
•ACD +X
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Thermal test equipment along with the chamber cold shroud provides the equivalent sink
temperatures needed to simulate the on-orbit radiative environment for all external surfaces
of the LAT
Heating is provided by resistance heaters
– Cartridge heaters for Radiator and Y-side ACD control zones
– Strip heaters on sink plates for +Z, +/-X sides of ACD, insides of Radiators, and
underside of X-LAT Plate
– Strip heaters mounted to the Test Stand to keep it at nominal LAT temperatures
Cooling is purely passive radiative cooling to the chamber cold shroud
– No GN2/LN2 circuits needed (TBR)
•ACD +Y
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•ACD -Y
•Rad +Y
•SC +Y
•SC +Y
•Rad +Y
•SC +Z
STE Heater Circuits
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
Heater Zones and Power
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The table below shows preliminary estimates for power needs for all control zones
– This will be updated prior to releasing the Test Plan  good numbers are needed to
finalize feedthrough requirements for the chamber and scope max power for power
supplies
– Updated values will be generated as part of final pre-test analyses
Required Heater Power and Control Zones for T-Vac Operations
Panel
Type
Rad -Y
Rad +Y
ACD +X
ACD +Y
ACD -X
ACD -Y
ACD +Z
SC Side Sim
SC Top Sim
Test Stand
IR Heat
IR Heat
Sink Pl
IR Heat
Sink Pl
IR Heat
Sink Pl
Sink Pl
Sink Pl
Strip Htr
Panel Temp Power Density Area Max Pwr
#
Tot Pwr
(degC)
(W/m^2/Zone) (m^2) (W/Zone) Zones
(W)
Min Max
Min
Max
Max
Max
2000
2
5000
2000
2
5000
-76
58
63.0
524.0
2.4
1258
1
1572
47.0
104.0
2.4
1000
2
2500
-79
-36
59.0
134.0
2.4
322
1
402
46.0
103.0
2.4
1000
2
2500
-82
-65
54.0
78.0
4
312
1
390
-26
8
160.0
271.0
4.94
1339
1
1673
-10
-5
207.0
241.0
3.24
781
1
976
-10
-5
51.8
60.3
-60
1
75
Total:
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20089
V
A
Comments
TBR
TBR
TBR
TBR
TBR
Notes:
Heater power based on 100 K ultimate sink on LN2 cold walls of chamber
Total power column includes 25% margin
STE Heater Circuits and
Power Requirements (TBR)
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
T-Vac Electrical Configuration Diagram
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
EGSE Cable Layout
TV Chamber Wall
LAT-DS-06458
LAT-DS-06458
LAT-DS-06458
LAT-DS-06458
BPU (Reg Pwr)
BPU-1
1-1A
1-1B
1-2A
1-2B
LAT-DS-06460
1-3
LAT-DS-06459
LAT-DS-06459
LAT-DS-06459
LAT-DS-06459
JL-232
JL-233
JL-234
JL-235
LAT-DS-06461
JL-1
1-4
BPU-2
1-5
LAT-DS-06460
LAT-DS-06461
JL-2
1-6
1-7
BPU-127
BPU-129
BPU-140
BPU-142
BPU-119
BPU-120
LAT-DS-06462
LAT-DS-06462
LAT-DS-06464
LAT-DS-06466
LAT-DS-06466
LAT-DS-06468
BPU
(Unreg Pwr)
BPU-133
LAT-DS-06468
2-1
2-2
2-3
2-4
2-5
2-6
2-7
JL-127
LAT-DS-06463
JL-129
LAT-DS-06463
JL-140
LAT-DS-06465
LAT-DS-06467
JL-142
LAT-DS-06467
JL-119
LAT-DS-06469
JL-120
LAT-DS-06469
JL-133
BPU-136
BPU-146
LAT-DS-06470
BPU-149
LAT-DS-06470
LAT-DS-06470
VSC
V121
V235
V122
V234
V124
V125
V233
LAT-DS-06470
LAT-DS-06472
LAT-DS-06474
LAT-DS-06476
V138
V232
V145
LAT-DS-06478
V131
LAT-DS-06472
V152
LAT-DS-06480
V238
V123
V239
V144
Ext Crate
EC-69 (Test Port)
Ex TP Inf
TP-39 (Test Port)
3-1
3-2
3-3
3-4
3-5
LAT-DS-06471
JL-136
LAT-DS-06471
JL-146
LAT-DS-06471
LAT-DS-06471
JL-149
LAT-DS-06473
LAT-DS-06475
JL-121
3-6
3-7
4-1
4-2
4-3
JL-122
LAT-DS-06477
JL-124
LAT-DS-06479
JL-125
LAT-DS-06473
JL-138
LAT-DS-06481
JL-145
4-4
LAT-DS-06482
LAT-DS-06484
LAT-DS-06484
4-5
4-6
4-7
LAT-DS-06483
JL-131
LAT-DS-06485
JL-152
LAT-DS-06487
JL-238
5-1
JL-123
5-2
JL-239
5-3
JL-144
5-4
JL-69 (Test Port)
5-5
NRL-266
Flyaway Thermistors
5-6
JL-39 (Test Port)
5-7
JL-266 (Flyaway Thermistors)
NRL-264
Flyaway Thermistors including ACD
Flyaway TC’s
LAT-DS-06488
LAT-DS-06488
6-2
LAT-DS-06488
LAT-DS-06488
LAT-DS-06488
MGSE TC’s
LAT-DS-06488
LAT-DS-06488
LAT-DS-06488
LAT-DS-06488
LAT-DS-06488
Removable TC’s
LAT-DS-06488
LAT-DS-06488
LAT-DS-06488
Temp Sensor
DAQ Sys (NRL)
LAT Environmental Test PDR
JL-264 (Flyaway Thermistors)
6-1
6-4
6-5
6-6
6-7
LAT-DS-06489
7-1
LAT-DS-06491
7-2
7-3
LAT-DS-06493
Terminal Strip
Flyaway TC’s
MGSE TC’s
Removable TC’s
7-4
7-5
7-6
LAT-DS-06488
ACD (Flyaway Thermistors)
6-3
7-7
LAT TV Electrical Layout
at NRL (No SIIS Harness)
Rev 7.6
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GLAST LAT Project
3-4 May 2005
Mechanical Handling
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Handling and mechanical operating procedures
– LAT lifting procedure
– LAT roll-over procedure
– Test Stand handling and operating procedure
– Dust tent handling and operating procedure
– LAT auxiliary cooling system operating procedure
Contamination control and cleanliness
– We are just starting to work through these issues seriously, now that the basic MGSE,
EGSE, and thermal configurations are understood
– Issues to work
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High-bay cleanliness: this is not a clean room  what are our cleanliness requirements and how
will we implement them
MGSE/EGSE bake-out: we will need to bake out hardware going into the T-Vac chamber, but the
spec’s on what needs to be done and the logistics of doing it have yet to be worked
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
Issues for Thermal-Vacuum Testing
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T-Vac Test Plan
– This has barely started to stabilize, and there are still many TBX’s
Preliminary design of thermal STE
– Sink plates and infrared heater cages need to be designed to confirm that Test Stand and
in-chamber layout is adequate
– System needs to be sized so we can buy feedthroughs, power supplies, and close out
other options that we are attempting to hold open (TCU, LN2 boil-off)
Preliminary pre-test analyses
– We have run some simplified cool-down scenarios, but none using actual chamber and
STE thermal designs
– This needs to be done to confirm that our current thermal design works
– Also needed to check lines of sight and establish where blinders and MLI needs to go to
block incidental IR heating coming from heater cages
– This also will finally give us a good estimate of projected cool-down and warm-up times,
including time-to-balance  this is needed before we can work on LAT functional test
scenarios during transitions
EGSE cabling
– What issues list isn’t complete without this topic?
– Feedthroughs are nearly spec’d out
– Next step is to spec cable lengths and start cable design (both inside and outside
chamber)
– Also need to work details of cable installation and check-out
LAT Environmental Test PDR
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GLAST LAT Project
3-4 May 2005
Conclusions
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Thermal-vacuum test planning has advanced considerably over the past four months
– We have a working Test Plan that is getting close to ready for release
T-Vac MGSE and STE designs and concepts are plausible, and work with the key MGSE Test
Stand and TIP hardware
EGSE cabling and feedthrough plans are nearly finalize and feedthrough orders will be placed
soon
Requirements for EGSE crates are almost fully defined and the EGSE meets them
We have progressed considerably in the past few months, but have many details to work out
still
LAT Environmental Test PDR
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