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Status of the EM Vib Tests

Gamma-ray Large Area Space Telescope. Status of the EM Vib Tests. GLAST Large Area Telescope: Tracker Subsystem. INFN - Bari. Outline. Test strategies First results Panel vib plan: tests done! Tray thermal plan: tests to be done Tower vib plan: ok plan and procedure ready for TRR,

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Status of the EM Vib Tests

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  1. Gamma-ray Large Area Space Telescope Status of the EM Vib Tests GLAST Large Area Telescope:Tracker Subsystem INFN - Bari

  2. Outline • Test strategies • First results • Panel vib plan: tests done! • Tray thermal plan: tests to be done • Tower vib plan: ok plan and procedure ready for TRR, fixture calibration done, tower test to be done • Tower thermal-vacuum plan: TBR • EM Matrix plan • Reference LAT Documents: • LAT-MD-00408, LAT Instrument Performance Verification Plan • LAT-SS-00788, LAT Environmental Specification • LAT-TD-01005, Thermal Test Results on Thick Converter Mock-up Trays • LAT-TD-01249, Thermal Test Results for Pre-Engineering Model Trays • LAT-PS-01584, LAT Tracker TraySSD Ladder Panel Assembly Procedure • LAT-TD-01004, EM Tray Vibration Test Plan • LAT-TD-01037, EM Tray Thermal Test Plan

  3. EM Tray vib levels White Noise Sine sweep Random vibration

  4. Tray vib set up W side on the top • Accelerometers position: • Control: two mono-axial accelerometers positioned on two of the four L-shaped block TP1&TP2 • Fixture: three mono axial accelerometers placed on a corner on one of the four L-shaped block TP6 • Tray: one three-axial accelerometer in the middle TP5 • Centrotecnica set up: • - 1 LDS V864LTshake table • 2 fixtures • 9 read out channels • 4 trays/day test rate capability

  5. EM Tray vib sequence thrust axis

  6. EM Trays: some results (1) Sine sweep before/after random Random vibration + White noise Z accelerometer response X accelerometer response Y accelerometer response Resonance search: 0= 815 Hz, Q  51 Resonance check: 0= 809 Hz, Q  49

  7. EM Trays: some results (2) Light ≈1000Hz ≈660Hz ≈ 800Hz Heavy tray Mid tray

  8. “Watch-dog” EM Trays: some results (3) Heavy tray (TS05) Q=100 @ 660Hz  Output-expected: 140.4 grms Applied notching on qual ASD: output ≤ 16 g2/Hz ( Q=10) “Watch-dog” Input-notched: 13.6 grms Output-notched: 59.6 grms

  9. / < 2% 530 EM Trays: summary Vib test pass criteria: / < 5% All trays first mode › 500 Hz

  10. EM Tower vib levels Sinusoidal vibration Sine burst: quasi static test@25Hz Modal survey Random vibration: new level

  11. Tower vib set up: Accelerometer locations

  12. Accelerometers location

  13. Fixture calibration

  14. EM Tower vib sequence X,Y,Z axis For each axis

  15. EM matrix

  16. Test plans & procedures: EM open items • Tower vib test • FEM from Hytec • Warning and abort levels • Discussion of non-conformances and procedure variations • Add a Sinusoidal test levels at protoflight level? Add a step …

  17. Flight units • New random level: Qual tower  Protoflight tower • Trays tower A vib level? • Trays flight vib level?

  18. Towers: random levels New levels Old levels (general GEVS levels) Qualification (12.3 grms, 2 min) Workmanship (6.8 grms, 1 min) Tower A Qualification (14 grms, 2 min) Qualification ?? (14 grms, 2 min) Trays for tower A Acceptance (8.7 grms, 1 min) Workmanship (6.8 grms, 1 min) Towers 1-16 Acceptance (10 grms, 1 min) Acceptance ?? (10 grms, 2 min) Trays for towers 1-16

  19. Fast electrical test* Tower assembly Electrical test Stacked cosmic rays* Thermal cycles Vacuum bakeout Ladder factory Vibration test Tray factory (panels) Tray assembly: ladders and MCMs on trays Tray assembly&test sequence Plyform G&A Mipot Centrotecnica Roma G&A * Live trays

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