GLAST LAT Project I&T Meeting – Jan 29,2004 E. Gawehn 1 GLAST Large Area Telescope: MGSE Status...
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Transcript of GLAST LAT Project I&T Meeting – Jan 29,2004 E. Gawehn 1 GLAST Large Area Telescope: MGSE Status...
GLAST LAT Project I&T Meeting – Jan 29,2004
E. Gawehn 1
GLAST Large Area Telescope: GLAST Large Area Telescope:
MGSE Status Report
Eric GawehnSU-SLAC
I&T MGSE Engineer
Gamma-ray Large Gamma-ray Large Area Space Area Space TelescopeTelescope
GLAST LAT Project I&T Meeting – Jan 29,2004
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MGSE OverviewMGSE Overview
Total of about 30 MGSE items to be produced for LAT integration
• Hardware– In this presentation only the main items will be addressed
• LAT Rotation Stand• LAT Support Fixture for the Grid Perimeter Ring (GPR) • LAT Transport Container• 90º Support for Van de Graaff (VDG) Tests
– Remaining MGSE items are about 50% complete
• Drawings– Critical Path Detail Drawings are 70% complete (goal is to have all
finished by Design Review)– Detailed drawings are 50% complete
• Remainder is being held up until formal stress analysis is completed
GLAST LAT Project I&T Meeting – Jan 29,2004
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LAT Rotation Stand – Personnel Access PlatformLAT Rotation Stand – Personnel Access Platform
• Design Philosophy– Provide more parallel work area in the Integration Hall– Minimize mechanical preparation for Flight work Ops
• Status – Two Concepts for Personal Access Platform are completed
( no major issues at this point)• Primary minimizes impact to work area, but adds about
$17K to Rotation Stand (delays final dwgs by ~ 15 days• Second impacts work area and time for mechanical
preparation Ops and may cost ~ $8K• Issues
– See Concept Views• Views do NOT imply detail dwg maturity; much work to
do
GLAST LAT Project I&T Meeting – Jan 29,2004
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2,743 mm
[ 108 inches ]
Wide
4,420 mm [ 174 inches ] Long
LAT Rotation StandLAT Rotation Stand
Interference with Grid Perimeter Ring is now
being worked out
GLAST LAT Project I&T Meeting – Jan 29,2004
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Heater Control Box Connector ClearanceHeater Control Box Connector Clearance
Heater Control BoxConnectors
Shown De-Mated
0.87”This Connector May Require a 90º Strain
Relief
Grid Perimeter Ring to Grid Bracket
Grid Perimeter Ring
- Z
GLAST LAT Project I&T Meeting – Jan 29,2004
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GPR with Heater Control Box Side ViewGPR with Heater Control Box Side View
GLAST LAT Project I&T Meeting – Jan 29,2004
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A-Frame Rotation Stand with Low Cost PAP*A-Frame Rotation Stand with Low Cost PAP*
* PAP – Pesonnel Access Platform
GLAST LAT Project I&T Meeting – Jan 29,2004
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A-Frame LAT Stand with Low Cost PAPA-Frame LAT Stand with Low Cost PAP
B-33, Rm 104 Integration Hall
Crane Structure
B-33 Beam; Not in Rm
Top Looking Down View
LAT A-Frame Integration
Stand
Low Cost Stand Takes Up Most of
the Rm
GLAST LAT Project I&T Meeting – Jan 29,2004
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Refined Rotation Stand with PAPRefined Rotation Stand with PAP
GLAST LAT Project I&T Meeting – Jan 29,2004
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Box Frame Stand with PAP, SmallBox Frame Stand with PAP, Small
GLAST LAT Project I&T Meeting – Jan 29,2004
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LAT Support Structure; GPRLAT Support Structure; GPR
• Design Philosophy– Bolt together frame with fairly precise bracketry
• Status– Concept is well understood– Stress Analysis completed and shows compliance to EWR
127.1 ( > 5 x against Ultimate )• The bracket clevice analysis needs 1 final iteration
Issues– Interference with heater control box connector is resolved
• Need to assess access for removal of Clevice Pin
GLAST LAT Project I&T Meeting – Jan 29,2004
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LAT Transport ContainerLAT Transport Container
• Design Philosophy– Attempting to fit in 88” Truck
• Taller and more narrow version adds $20-30K for engineering and mass plate
– Have a concept that works but requires additional ~ $20K for non-std truck width for cross-country ride to NRL• Isolation system appears satisfactory
• Work in progress– Layout is in work; may not be available next week– Vibration report by next week – (First Iteration, expect
another iteration for final design to follow) • Issues
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Other Important ItemsOther Important Items
• Vibration Test Fixture– Have SC Bracket Dwg; We are building model– Stress indicates four small interface brackets to NRL shaker will
work• No need for $20K large interface plate
• Environmental Tests @ NRL– Expect MGSE Concept for TVAC and EMI ready for presentation
next week ( detail dwgs ~ 80% complete )– Need feedback from NRL
• NRL needs to define Cold / Hot Plate Heat Exchanger Sizing and plumbing
• Need sizes to determine if Heat Ex’rs can be safely slid into place ( Eric believes they can )
• Single Tower Airplane Test– MGSE on hold until PAP is more mature
• Can be worked if additional designer is available
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SummarySummary
• Need Authorization to Proceed for:– Purchase of long lead items
• GPR frame pieces• GPR to Grid attach bracketry• Support Shaft Materials and Machining• Bearings• Rotation Drive, Flex Coupling & Drive Motor
– Rotation System Weldment– LAT Lift Spreaders
• Z Axis Vertical (analysis in work)• Z Axis Horizontal (analysis in work)
– Proof Test Hardware• Design to begin after GPR ATP