Systems Integration 1

GLAST LAT Project

March 2005

LAT Environmental Test Planning MeetingLAT Environmental Test Planning Meeting

14-16 March 200514-16 March 2005

Environmental Test

MGSE Design Concepts

Rev 1Rev 1

LAT Environmental Test Planning MeetingLAT Environmental Test Planning Meeting

14-16 March 200514-16 March 2005

Environmental Test

MGSE Design Concepts

Rev 1Rev 1

Martin Nordby Mike FossMartin Nordby Mike Foss

Systems Integration 2

GLAST LAT Project

March 2005 OutlineOutline

• Environmental test sequence

• Sine Vibe test MGSE and configurations

• EMI/EMC test MGSE

• Acoustic test MGSE

• T-Vac test MGSE and configuration

• High-Bay operations

– Options for rotating the LAT

– Transport Container

– Cart design concepts

Systems Integration 3

GLAST LAT Project

March 2005 Environmental Test Sequence: Working BaselineEnvironmental Test Sequence: Working Baseline

Modal Survey

Sine Vibe EMI/EMCCL

Install Radiators

AcousticL

T-CycleT-Bal Remove Radiators

Weight, CG

Ship to GD

CL LM

Receive, Unpack C L

C

Aliveness

Limited Performance

Comprehensive Performance

Muon Survey

C

A

M

L L

Pack LAT A

L

Final CPT

C

Reference CPT Performed at SLAC

Systems Integration 4

GLAST LAT Project

March 2005 Sine Vibe: Test ConfigurationSine Vibe: Test Configuration

LAT on Shaker TableLAT on Shaker Table

Test Interface Plate fits completely on

expander head

LAT on Expander HeadLAT on Expander Head

(with auxiliary support)(with auxiliary support)

LAT appears toclear rotation

of expander head

Check on clearance to off-load frame

Systems Integration 5

GLAST LAT Project

March 2005 Sine Vibe: Test Configuration (cont.)Sine Vibe: Test Configuration (cont.)

LAT on Expander HeadLAT on Expander HeadShowing GPR Lift with 4x4 Lift FixtureShowing GPR Lift with 4x4 Lift Fixture

Check on clearance and access around underside of GPR

Check on total height of 4x4 Lift Fixture lifting GPR over top of ACD

Systems Integration 6

GLAST LAT Project

March 2005 Sine Vibe: MGSE ConceptSine Vibe: MGSE Concept

• Test Interface Plate

– Provides single interface for LAT in all test configurations

– Mimics SC top deck

– Ensures accurate alignment of SC flexures

Test Interface Plate Test Interface Plate with SC Flexureswith SC Flexures

(on slip table)(on slip table)

Mount brackets transfer load from flexure directly to table

Test Interface Plate Test Interface Plate with SC Flexureswith SC Flexures

(on expander head)(on expander head)

Plate serves only to accurately position brackets,

not to carry vibe loads

Systems Integration 7

GLAST LAT Project

March 2005 Sine Vibe: MGSE Mount DetailSine Vibe: MGSE Mount Detail

Systems Integration 8

GLAST LAT Project

March 2005 Sine Vibe: Mechanical IssuesSine Vibe: Mechanical Issues

• Known issues to be worked

– Clearance to off-load frame on expander head

– Verify that Test Interface Plate fits completely on expander head

– Verify that LAT clears bracket parts on slip table

– Complete and release drawings/model of slip table and expander head

– Complete detailed design and analysis of TIP and flexure mount brackets

– Check on hook height in vibe room to ensure we can remove GPR when LAT is on expander head

– Develop paper doll work-up to verify we have floor space for 2 carts, GPR, and 4x4 Lift Fixture

– Develop requirements for Radiator simulator for sine vibe

– Lay out EGSE cable routing and locate EGSE crates

– Identify what contamination and humidity control is needed in vibe facility

• MGSE Requirements List

– Test Interface Plate• Light enough to allow for using GPR to lift LAT+TIP within its current rated load (3000 kg)• Accommodates Spectrum-specified flexure mounting procedures

– Contamination/environmental

Systems Integration 9

GLAST LAT Project

March 2005 Sine Vibe: Action Item StatusSine Vibe: Action Item Status

• V100: strain gauges on SC flexures

– They will fit easily on flexures using TIP interface concept

– OK to leave in place for acoustic testing and LAT turn-over, if desired

• V101: clearance to rotate shaker head

– Appears to be adequate clearance to the LAT

– Current plan is to set LAT back on cart while shaker is being re-configured, so this action is moot

• V102, V114: provide CAD file of vibe table and facility

– Second draft of table, expander head, and entire vibe set-up, and facility in-hand at SLAC

– Final check and release in-process

• V110: SC interface definition from Spectrum

– Test Interface Plate is intended to allow us to integrate SC flexure just like Spectrum does

– Need to work with GSFC and Spectrum to transfer detailed procedures from Spectrum for our use

• V115: Logistics of using flexures and TIP

– TIP and flexures will be mounted at SLAC, and used for transport and all tests

– This means that they have to be light enough so GPR can pick up the LAT+TIP load

• V117: LAT cleanliness during vibe testing

– We are carrying an option for a Dust Tent that can be moved around with the LAT

– Still need to specify what cleanliness requirements are

Systems Integration 10

GLAST LAT Project

March 2005 EMI/EMC Test: Test Configuration and MGSEEMI/EMC Test: Test Configuration and MGSE

LAT on Test StandLAT on Test Stand(Vertical Configuration)(Vertical Configuration)

This configuration is identical to Acoustic Test configuration

Clear access to perimeter of LAT for placing antennas

Systems Integration 11

GLAST LAT Project

March 2005 EMI/EMC Test: Mechanical IssuesEMI/EMC Test: Mechanical Issues

• Known issues to be worked

– Identify antenna size and placement and check orientations around LAT

– How to get LAT on Test Stand into chamber

– Chiller lines electrical resistance to ground along lines: TBD

– Antenna placement/angles around LAT: for finalizing MGSE footprint

– Contamination: cleanliness during move and in chamber; humidity under any clean tent

– Test Stand grounding: how to ground test stand

• Requirements List

– Provide grounding caps for thermal and accel instrumentation

– Chiller lines electrical resistance to ground along lines: TBD

– Antenna placement/angles around LAT: for finalizing MGSE footprint

– Contamination: cleanliness during move and in chamber; humidity under any clean tent

– Test Stand grounding: how to ground test stand

Systems Integration 12

GLAST LAT Project

March 2005 EMI/EMC Test: Action Item StatusEMI/EMC Test: Action Item Status

• E103: terminate test instrumentation at EMI Shield for thermal and accel’s

– Grounding caps will be available for this instrumentation

• E110: chiller lines need electrical break

– No progress, but this should not be an issues

– Need definition of resistance to ground along lines

• E112, E113: moving LAT to and into chamber

– Test Stand concept is much more transportable than previous design

– Plan to use Cart into chamber, or add pads for casters or air-bearings

– No progress on developing route from High-Bay

• E114: develop CAD model of chamber

– First draft sent to SLAC

– Plan to complete and release next

• E115: work out needed antenna orientations around MGSE

– Current MGSE leaves LAT much more open around base perimeter

– Still need requirements on antenna placement to finalize MGSE design

• E116: clean tent around LAT in EMI chamber

– Incorporated provision for tent on Test Stand, but no progress on this

– Still need to define cleanliness requirements

Systems Integration 13

GLAST LAT Project

March 2005 Acoustic Test: Test Configuration and MGSEAcoustic Test: Test Configuration and MGSE

LAT on Test StandLAT on Test Stand(one Radiator removed(one Radiator removed

Test Interface Plate mounts LAT to Test Stand

Facsimile SC struts support Radiators with comparable

stiffnessNeed to establish required height off ground—can be

handled by a separate stand

This configuration is identical to EMI Test configuration

Systems Integration 14

GLAST LAT Project

March 2005 Acoustic Test: Mechanical IssuesAcoustic Test: Mechanical Issues

• Known issues to be worked

– Is a dust tent needed around LAT in acoustic chamber

– What type of panels are needed in/around LAT to simulate SC response

– Accommodation for moving Test Stand over ½” door sill

– How high does Radiator need to be off the floor: affects Test Stand spacer height

• MGSE Requirements List

– Radiator strut stiffness: need input from Spectrum

– Contamination: is tenting needed; humidity

Systems Integration 15

GLAST LAT Project

March 2005 Acoustic Test: Action Item StatusAcoustic Test: Action Item Status

• A101: supporting LAT at SC flexures vs Radiator Mount Brackets

– No longer an issue. Test Stand concept preserves flight-interface

• A102: add sheet under LAT

– Is this needed and/or feasible

– May not work given Test Stand design, since it blocks free-dropping of particulates

• A104: Radiator support strut stiffness

– Need to get stiffness from Spectrum

– Test Stand can accommodate/tune support strut mount to simulate flight-like stiffness

• A106: horizontal vs vertical orientation

– Test Stand is designed to allow for either, but default is vertical

– Open issue is how far off the ground the bottom of the Radiators should be

• A109: LAT clean tent in acoustic chamber

– Test Stand can accommodate a clean tent

– Need to work the requirements for this

• A110: moving LAT into chamber over ½” door sill

– Test Stand can accommodate large casters or air bearings

– Need to add accommodation for multiple positions of these, since Stand only has 4 feet

• A111: acoustic chamber CAD model

– Preliminary layout sent

– Next step is to complete layout and release it

Systems Integration 16

GLAST LAT Project

March 2005 Thermal-Vacuum Test: Test ConfigurationThermal-Vacuum Test: Test Configuration

LAT on Test StandLAT on Test StandOriented HorizontallyOriented Horizontally

LAT rolls into chamber on floor

Port plate for LAT elec, gas feedthroughs

Systems Integration 17

GLAST LAT Project

March 2005 Thermal-Vacuum Test: Test ConfigurationThermal-Vacuum Test: Test Configuration

View from Inside ChamberView from Inside Chamber

SIIS, thermal sensor cable routing

Front View with Chamber Front View with Chamber Cut AwayCut Away

Chamber Plan View (PDF file)

Systems Integration 18

GLAST LAT Project

March 2005 Thermal-Vacuum Test: MGSE ConceptThermal-Vacuum Test: MGSE Concept

Extension beams double as support legs

LAT on Test StandLAT on Test Stand(Horizontal Configuration)(Horizontal Configuration)

Radiators mounted to Test Stand in vertical

orientation

Upper extension beams are used for lifting LAT into place, then removed

Systems Integration 19

GLAST LAT Project

March 2005 Thermal-Vacuum Test: MGSE Concept (cont.)Thermal-Vacuum Test: MGSE Concept (cont.)

ACD Sink Plates on an independent support frame

LAT on Test StandLAT on Test Stand(Horizontal Configuration)(Horizontal Configuration)

Possible hydraulic assist for rotating detaches for T-Vac

Systems Integration 20

GLAST LAT Project

March 2005 Thermal-Vacuum Test: Mechanical IssuesThermal-Vacuum Test: Mechanical Issues

• Known issues to be worked

– Trapped air volumes: contamination issue

– Thermal stability of support: how level will it keep the LAT and what is requirement

– Sink panel design and support: 5 ACD, 3 SC, 2 Rad

• Requirements list

– Leveling: what is accuracy and precision needed for heat pipes; any stability req’s?

– Test Stand allowed temps: temperature range that Test Stand may see

– Allowed parasitic conduction and radiation to/from Test Stand and other MGSE

Systems Integration 21

GLAST LAT Project

March 2005 Thermal-Vacuum Test: Action Item StatusThermal-Vacuum Test: Action Item Status

• T102, T114: clearances in and around T-Vac chamber and chamber dimensions

– Chamber model delivered to SLAC and incorporated

– Clearance evaluations are in the works

• T110, T130, T137, T138: define leveling requirements for heat pipes, any muon surveys; inclinometers needed?

– No progress

• T118: MGSE temperature requirements

– Agreed to keep Test Stand in a ~-10—+20 degC range

– Still working details of heating/cooling/isolation needed

• T126: agree to structural supports of LAT in T-Vac

– Test Stand provides flight-like structural and thermal interface for LAT

– Eliminated all options using GPR

• T127: develop T-Vac STE list

– Started list of MGSE, but not complete

Systems Integration 22

GLAST LAT Project

March 2005 High-Bay OperationsHigh-Bay Operations

• LAT handling

• Options for rotating the LAT

• Other MGSE

– Transport Container

– Carts

– Dust Tent

• Lists

– Known issues to be worked

– Open issues

– Requirements list

• Action item update

Systems Integration 23

GLAST LAT Project

March 2005 LAT Handling and LiftingLAT Handling and Lifting

LAT on Test StandLAT on Test Standwith Extension Beams for Liftingwith Extension Beams for Lifting

Extension beams bolt to Test Stand to allow for over-the-cg lift Will likely need spreader bars or

frame to close out extensions

LAT on Test StandLAT on Test Standwith Extender Beams Horizontal Lift and Feetwith Extender Beams Horizontal Lift and Feet

Need 4 pick points for crane lift in horizontal configuration

Systems Integration 24

GLAST LAT Project

March 2005 Options for Rotating the LATOptions for Rotating the LAT

• The LAT needs to be rotated twice; both times with the Radiators attached

– Rotate down to +Z-horizontal in preparation for T-Vac testing

– Rotate back up to +Z-vertical after T-Vac, before removing Radiators

• Three options for rotating LAT

– Rotate over-center (PDF file)• Fixed pivot on Test Stand• Uses hydraulic-assist damping

– Rotate under-pivot• Fixed pivot on Test Stand• CG swings down, under the pivot point to

prevent over-center problems• Requires spacer stands

– Two-hook crane pick (PDF file)• Use two crane hooks• Rotate LAT while hanging

LAT Being RotatedLAT Being Rotated over-center rotation using hydraulic over-center rotation using hydraulic

dampingdamping

Pivot points built into Test Stand

Crane pick points to hold LAT while it rotates over-center

Hydraulic cylinders are passive dampers, not active assist devices

Systems Integration 25

GLAST LAT Project

March 2005 Other MGSE for LAT Handling OperationsOther MGSE for LAT Handling Operations

LAT Handling MGSE Dedicated Env Test MGSE and STEGrid Perimeter Ring (GPR) LAT Test StandGPR to Grid Interface Brackets Radiator Test StrutsLAT Integration Stand LAT CartPersonnel Access Platform (PAP) MGSE CartLAT Lift Fixture, Z Axis Vertical Radiator Mass SimulatorLAT Transport Container LAT Dust TentTest Interface Plate Mass Properties Mount PlateSC Flexures Turn-over Support StandsRadiator Lift Fixture

Systems Integration 26

GLAST LAT Project

March 2005 High-Bay Operations: Mechanical IssuesHigh-Bay Operations: Mechanical Issues

• Known issues to be worked

• Requirements list