MGSE Design - Stanford University · MGSE Design Martin NordbyMartin Nordby Mike FoMike Fossss Marc CampellMarc Campell JJohohn Kun Ku. LAT Environmental Test PDR 2 ... ancillary

LAT Environmental Test PDR 1

GLAST LAT Project 3-4 May 2005

LAT Environmental Test Planning and Design Review

3-4 May 2005

MGSE Design

LAT Environmental Test Planning and Design ReviewLAT Environmental Test Planning and Design Review

33--4 May 20054 May 2005

MGSE DesignMGSE Design

Martin Nordby Mike Foss Marc Campell John KuMartin Nordby Mike Foss Marc Campell John Ku



Environmental Test MGSE Design ConceptEnvironmental Test MGSE Design Concept

• Test Interface Plate– LAT is mounted to the TIP at SLAC,

and stays mounted to it until integration on the SC

– This eliminates the need for complex load transfers and additional MGSE

• Test Stand– For all tests but the sine vibe test,

the LAT is mounted to the Test Stand

– This serves as a support, transport cart, and frame off of which ancillary MGSE and STE is mounted

• Transport Container– This is comprised of a pallet with a

base-isolated mount plate and a cover

– The LAT is bolted to the mount plate by way of the TIP

– The pallet also serves as a storage base for the LAT at NRL and Spectrum

• All other MGSE is secondary to these 3

LAT

Test Interface Plate Test Stand

SC Flexures

LAT on Test StandLAT on Test StandSupported by the Test Interface PlateSupported by the Test Interface Plate



TIP / Test Stand Preliminary Design and OperationsTIP / Test Stand Preliminary Design and Operations

• This is “home base” for the LAT– Used for all tests– Easy to add to or adapt for test-

specific needs• The Test Stand provides all functions

needed for handling the LAT– Moving, hoisting, and turn-over

are all done using the Test Stand– Casters, jacks, and extension

beams are all removable to accommodate any test configuration

• All load transfers are straightforward, with simple bolted joints and standard hoisting and rigging

LAT LAT UprightingUprighting Operation After TOperation After T--VacVac

Cross-Bars for load-sharing during turn-over

Empty TIP on Test StandEmpty TIP on Test Stand

Extension Beams for:-above cg lifting-turning over-horiz lifting-horiz support in T-Vac

Test Interface Plate

SC Top Deck Acoustic Sim



Transport and Storage ContainerTransport and Storage Container

• Transport Container provides isolated environment for the LAT during transport

– Wire rope coils isolate LAT from shock and medium/high frequency vibrations

– Air-tight container allows for purging to maintain low humidity in the box

– Insulated cover isolates LAT from ambient temperature extremes

• Pallet doubles as a work platform– With the cover removed, the pallet

provides clear access to the LAT for pre- and post-ship testing

– We may use this as a storage location for the LAT between operations at NRL

Transport Container PalletTransport Container Pallet

Vibration isolating wire rope coils

Mount plate

Test Interface Plate

Cover mounts around perimeter of pallet

LAT on Transport Container PalletLAT on Transport Container Pallet



Environmental Test Flow and MGSE/STE UseEnvironmental Test Flow and MGSE/STE Use

EMI/EMC TestLPT

Mount RadiatorsLAT LPTRadiator CPT

Mount on Test Stand

Z-axis Sine VibeLPT

Unpack, Prep, CPTX-axis Sine VibeLPTY-axis Sine VibeLPT

Receive LATfrom SLAC

Acoustic TestLPT

Turn OverPrep for T-Vac

CPT, SVACThermal-Vac TestCPT, SVAC

Pack, Prep, and Ship to SASSRotate Upright Remove Radiators

De-Mount off Test Stand

Measure Mass, X/Y C.G.

PackRadiators



MGSE ListMGSE List

• The table shows a complete list of all known MGSE needed for environmental testing at NRL and transporting the LAT

MGSE Assembly Ship

/Rec

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Hig

h-B

ay O

psSi

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ibe

EMI/E

MC

Aco

ustic

T-Va

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Use / CommentsTest Interface Plate Ass'y X X X X X X Mounts LAT to slip table/expander head/Test StandTest Stand X ? X X X Support for EMI, acoustic, T-Vac tests; transportsTransport Container X X Holds LAT for shipping, storageDust Tent ? ? ? X ? X Covers LAT in un-regulated environmentChill Bars and Aux. Cooling ? X X X X X Cools LAT for in-air LPT's/CPT'sSC Top Deck Acoustic Sim X Simulates SC top deck acoustic responseRadiator SC Strut Sim's X X X Simulates SC support struts for RadiatorsGrid Perimeter Ring X X X Lifting fixture for hoisting LAT into position4 x 4 Lift Fixture X X X Lifting fixture for hoisting LAT into positionRadiator Lift Fixture X Supports Radiators during integrationMGSE Cart X X Parking space for GPR / 4 x 4 FixtureHeat Pipe Restraining Plates X X X X Supports un-attached DSHP's/XLHP'sExtension Beams X X Used for turn-over and horiz lift/support of Test StandSpreader Bars X ? Used for turn-overRadiator heater frame X Supports cartridge heaters for Rad sinksACD sink plates X Provides equiv sink env for ACD sidesACD sink plate support frame X Supports ACD sink platesSC Simulator sink plates X Provides equiv sink env for Rad backsidesTop deck sink plate X Provides equiv sink env for X-LAT Plate

X = needed for test ? = need is TBD or TBR for test

MGSE/STE Needed for Environmental TestingMGSE/STE Needed for Environmental Testing



Test Interface Plate (TIP) DesignTest Interface Plate (TIP) Design

SC Flexure mounted to plate by way of SC Flexure mounted to plate by way of Mount BracketMount Bracket

Mounting hardware and method is identical to Spectrum plans

SC Flexure

Mounting hardware passes through plate

Aluminum interface plate carries no loads, but only locates Flexures

• The TIP is permanently mounted to the LAT after LAT integration

– This is done at SLAC– Mounting procedure for SC flexures

• All 4 flexures are positioned using Spectrum’s master gauge tool (the slave was used for machining our Grid holes)

• Mount brackets are positioned and bolted• Flexure-Bracket holes are match-reamed

and hardware installed• (Still needs Spectrum review)

• The Grid Perimeter Ring is used for hoisting the LAT

– This means that the TIP hangs from under the LAT

– The TIP needs to be light enough to not cause any loading issues

• Design status– Detailed drawings complete and in

check– Preliminary analysis in process– Final structural analysis not started– Plan for completion early enough to use

in Grid Qual testing



TIP Design Requirements Summary from Test PlansTIP Design Requirements Summary from Test Plans

• Loads and Capabilities– Capable of handling inertial loads of LAT during sine vibe test and transport– Carries LAT when horizontal or vertical, plus thermal stresses due to temp variations in

T-Vac– Total TIP mass not to exceed 200 kg (current estimate: 129.5 kg), so LAT + TIP can be

lifted using the Grid Perimeter Ring• Interfaces

– Provides alignment of flexures that matches Spectrum alignment– Compatible with vibe table expander head and slip table bolt patterns– Mounts to: Test Stand, Transport Container pallet, Mass properties mount plate

• Accommodations– Accommodates a top deck acoustic simulator– Accommodates installation of a SC top deck sink plate between TIP and X-LAT Plate



TIP Structural AnalysisTIP Structural Analysis



Test Stand DesignTest Stand Design

• Test Stand is designed to be simple to fabricate and test

– Welded box beam construction is welded clean then painted

– Sub-assemblies are machined to provide accurate mounting hole patterns

– Assembly is proof- and operationally tested independent of the LAT, using Spectrum test weights (TBR)

• Design status– Detailed drawings complete and in

check– Preliminary analysis in process– Final structural analysis not started– Completion tied to Pathfinder schedule

Test Stand Test Stand WeldmentWeldment

Removable casters for moving LAT

Test Stand AssemblyTest Stand Assembly

TIP interface bolt plates

Extender Beam bolt plates



Test Stand Design Requirements Summary from Test PlansTest Stand Design Requirements Summary from Test Plans

• Loads and Capabilities– 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– Includes active heating to stabilize average temps

• Interfaces– Extension Beams compatible with T-Vac trolley mounting and floor loading capabilities

• Accommodations– Accommodates SC simulator sink plates during T-Vac– Provides clear access around LAT perimeter and underside for EMI test antennae



Test Stand Structural AnalysisTest Stand Structural Analysis



Transport Container DesignTransport Container Design

• Some preliminary features– LAT is ship weight is ~ 7500 lbs

• Construction– 2-piece Aluminum with Base Pallet and Lid

Box– Lid is hoisted on and off– 6” min (TBR) clearance from instrument

• Design status– Proof-of-concept design complete– Re-working design to spec as a turn-key

design/build contract– In the process of specifying LAT design

and performance constraints, then the spec and statement of work will be bid for design, fab, and testing

Cover Box provides clearance for LAT dynamic motion

LAT in Transport ContainerLAT in Transport Container

LAT on Base PalletLAT on Base Pallet(Cover Box removed)(Cover Box removed)

Base PalletBase Pallet(LAT + TIP removed)(LAT + TIP removed)

TIP mounts directly to Pallet mount plate

Base-isolation coil springs

Mount plate provides rigid mount for LAT



Transport Container Design Requirements SummaryTransport Container Design Requirements Summary

• Loads and Capabilities– Capable of handling transportation loads of LAT + TIP by air or truck– Capable of storing LAT for 24 hours (TBR) outside– Capable of being lifted by forklift or moved by air bearings– Provides base isolation to protect LAT from accelerations exceeding fight design levels,

given an input of ground- or air-transport acceleration spectra• Interfaces

– Compatible with Test Interface Plate– Standard skids, lifting features, and tie-downs for transportation equipment

• Accommodations– Provides clearance around LAT to allow for relative motion due to base-isolation system– Cover includes: port for mounting purge line, two-way pressure relief valve and filter for

incoming air, feedthroughs for environmental monitors (TBR)– Internal cleanliness level Class 10,000 TBR—LAT is not bagged TBR (can’t contact ACD

MLI)– Environmental monitors to track temperature, humidity, and 3-axis accelerations during

transport (on container and LAT mount plate)



NRL Environmental Test FacilitiesNRL Environmental Test Facilities

• Facilities drawings are being developed for all areas where LAT will be located or tested– Intended to capture all facility-specific information needed for LAT testing– This includes power and network tie-in points for testing LAT

• All drawings are in work now, with either advanced check prints or released versions (in NRL configuration management system)

NRL Facility Drawings and StatusDoc # Rev Title Status Comments

LAT-DS-05905 01 Vibration Table Pending Release Expander head support mods to be included in future rev

Vibration Lab Floor Plan DraftEMI Chamber Floor Plan DraftAcoustic Chamber Floor Plan Draft

LAT-DS-05907 01 TVAC Chamber Pending ReleaseLAT-DS-01974 01 TVAC Chamber Interface Cable Ass'y, Internal Pending ReleaseLAT-DS-01975 01 TVAC Chamber Interface Cable Ass'y, External Pending ReleaseLAT-DS-05899 01 Clean Tent Pending Release

NRL Facility DrawingsNRL Facility Drawings



MGSE Development TimelineMGSE Development Timeline



MGSE and Facilities Issues ListMGSE and Facilities Issues List

• Summary– The three key pieces of MGSE have been designed and are in the process of being

analyzed and finalized– Concepts exist for most of the remaining MGSE

• Issues– Our pathfinder program is keyed to receiving the TIP and Test Stand by mid-September.

These are big parts which will take time to fab, inspect, and test Marc Campell is developing a detailed design and fab schedule for these

– STE sink plates for T-Vac are still poorly designe, thermally. These need to be spec’d out to confirm that we have preserved enough space for them, and that the Test Stand works as-designed Martin Nordby actively working with thermal people to lock in the thermal design and spec out the design of these

Documents

MGSE Design - Stanford University · MGSE Design Martin NordbyMartin Nordby Mike FoMike Fossss Marc CampellMarc Campell JJohohn Kun Ku. LAT Environmental Test PDR 2 ... ancillary