7E2: EM test plans

1
7E2 EM test plans
GLAST Large Area TelescopeTracker Subsystem

Nicola MazziottaUniversity and INFNBari -
Italymazziotta_at_ba.infn.it
2
Outline

• Test strategies
• First results
• Panel vib plan
• Tray thermal plan
• Tower vib plan
• Tower thermal plan
• 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 Tray SSD Ladder Panel
  Assembly Procedure
• LAT-TD-01004, EM Tray Vibration Test Plan
• LAT-TD-01037, EM Tray Thermal Test Plan

3
Tray assemblytest sequence
Live trays
4
Tray vib levels
White Noise
Sine sweep
Frequency range 20 ? 2000 Hz
Sweep rate 2 oct/min
Target Amplitude 0.5 g0-pk
Frequency (Hz) ASD WN Level(g2/Hz) Overall grms Duration (min)
20 2000 10-4 0.45 1
Random vibration
Frequency (Hz) ASD Qual Level (g2/Hz) ASD Accept Level (g2/Hz) ASD Launch Level(g2/Hz)
20 0.026 0.013 0.0065
20-50 6 dB/oct 6 dB/oct 6 dB/oct
50-800 0.16 0.08 0.04
800-2000 -6 dB/oct -6 dB/oct -6 dB/oct
2000 0.026 0.013 0.0065
Overall 14.0 grms 10.0 grms 7 grms
Duration 2 min 1 min 1 min
5
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
  TP1TP2
• 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 V864LT shake table
• 2 fixtures
• 9 read out channels
• 4 trays/day test rate capability

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Tray vib sequence thrust axis
Step Description Test Level
1 Fixture, tray and accelerometers mounting
2 Fixture calibration and tray resonance search Sine sweep 0.5 g 0-pk
3 Pre-random vibration White noise 0.45 grms
4 Random vibration Random vibration Launch
5 Post/Pre-random vibration White noise 0.45 grms
6 Random vibration Random vibration Acceptance
7 Post/Pre-random vibration White noise 0.45 grms
8 Random vibration Random vibration Qualification
9 Post-random vibration White noise 0.45 grms
10 Normal mode check Sine sweep 0.5 g 0-pk
11 Dismounting
12 Test completion
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First results TG07 (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
8
Last Vib Runs (Mar, 17-19) (1)
Light
1000Hz
660Hz
800Hz
Heavy tray
Mid tray
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Last Vib Runs (Mar, 17-19) (2)
Heavy tray (TS05) Q100 _at_ 660Hz ?
Output-expected 140.4 grms
Applied notching on qual ASD output 16 g2/Hz
(?? Q10) Watch-dog
Input-notched 13.6 grms Output-notched 59.6
grms
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EM Vib Runs Summary (16 trays)
No relevant changes in the resonance frequency
after the random
All trays first mode 500 Hz
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Thermal tests on pre-EM trays set-up
Procedures LAT-TD-1037 Pre-EM Results
LAT-TD-1249
Service box
12
Thermal tests on pre-EM trays some results
Stability _at_ plateau dT/dt lt 3C/hr
Tchamber
Tsilicon
Silicon temperature delay ? 45 min
plateau ? 5 hr
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Tray thermal levels
Acceptance Qualification/Survival
Temperature Range -20C ? 35C -30C ? 50C
of cycles 4 4
Temperature rate 20C/hr 20C/hr
Pressure 1 atm T-C 10-5 Torr T-V 1 atm T-C 10-5 Torr T-V
Duration _at_ T extreme 5 hr 5 hr
Total Duration 62 2 hr 72 2 hr
T-C Thermal cycle (dummy trays) T-V Thermal
vacuum (live tray)
On orbit temperature range -15C ? 30C
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Tray thermal sequence
The EM dummy trays will be tested at ambient
pressure into the service boxes
Step Description Level
0 Strain gauges and thermocouple set up
1 Chamber set up
2 Strain gauges calibration
3 Thermal cycles Qualification
4 Dismounting
5 Test completion
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Tower vib levels
Low frequency sine sweep
White Noise
Frequency (Hz) ASD WN Level(g2/Hz) Overall grms Duration (min)
20 2000 10-4 0.45 1
Random vibration
Frequency(Hz) ASD Acceptance Level (g2/Hz) ASD Qualification Level (g2/Hz)
20 0.01 0.02
20-50 5.9 dB/oct 5.9 dB/oct
50-800 0.06 0.12
800-2000 -5.9 dB/oct -5.9 dB/oct
2000 0.01 0.02
Overall 8.7 grms 12.3 grms
Duration 1 min/axis 2 min/axis
High frequency sine sweep
Frequency range 20 ? 2000 Hz
Sweep rate 2 oct/min
Target Amplitude 0.5 g0-pk
16
Tower vib set up

• Accelerometers set up (TBR)
• 3 axial on the shaker table (control
  accelerometer)
• 3 axial on the center of the bottom tray lower
  surface
• 3 axial on the center of the top tray upper
  surface
• 3 axial accelerometer X sidewall center of the
  thermal boss tray number 12
• 3 axial accelerometer Y sidewall near the center
  of the tray number 10
• 3 axial accelerometer Y sidewall center of the
  thermal boss of the tray number 1
• 3 axial accelerometer Y sidewall center of the
  thermal boss of the tray number 19
• 3 axial accelerometer -X sidewall center of the
  thermal boss of the tray number 10
• 3 axial accelerometer -Y sidewall near the center
  of the tray number 10, on the center plane

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Tower vib sequence X,Y,Z axis
For each axis
Step Description Test Level
1 Fixture, tower and accelerometers mounting
2 Fixture calibration High frequency sine sweep 0.5 g 0-pk
3 Normal mode search High frequency sine sweep 0.5 g0-pk
4 Pre-random vibration White noise 0.45 grms
5 Random vibration Random vibration -6 dB Qual
6 Post/Pre-random vibration White noise 0.45 grms
7 Random vibration Random vibration -3 dB Qual
8 Post/Pre-random vibration White noise 0.45 grms
9 Random vibration Random vibration 0 dB Qual
10 Post-random vibration White noise 0.45 grms
11 Normal mode check High frequency sine sweep 0.5 g0-pk
12 Low frequency test Low frequency sine sweep Qual
13 Dismounting
14 Test completion
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Tower thermal levels
Thermal-Vacuum cycling/Qual-Surv level Thermal-Vacuum cycling/Qual-Surv level
Ranges -30C ? 50C
of cycles 8 (12)
Temp. rate 20C/hr
Pressure 10-5 Torr
Duration _at_ extreme 12 hr
Total Duration 256 (384) hr stabilization
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Tower thermal set up
Tower covered with a thermal blanket during T-V
cycles.
The tower has a large number of thermocouples in
the read out cables that can be acquired by using
the TKR DAQ system.

• Additional thermocouples (TBR)
• Y sidewall center of the thermal boss of the
  tray number 1
• X sidewall center of the of the tray number 1,
  on the center plane
• Y sidewall center of the thermal boss of the
  tray number 19
• X sidewall center of the of the tray number 19,
  on the center plane
• -X sidewall center of the thermal boss of the
  tray number 10
• -Y sidewall near the center of the tray number
  10, on the center plane

The temperature control point for the cold part
of the cycle will be the coldest thermocouple,
while the control point for the hot part of the
cycle will be the hottest one.
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Tower thermal sequence
Step Description Level
0 (Strain gauges and) Thermocouple set up
1 Chamber set up
2 (Strain gauges calibration)
3 Thermal vacuum cycles Qualification/Survival
4 Dismounting
5 Test completion
21
EM matrix
Item Quantity Quantity to test High freq sine Sweep 20-2000 Hz Random Vibe White noise Low freq sine Sweep 5-50 Hz Functional Thermal Cycle Thermal Vacuum Test site
Panels 24 24 Qual Z axis Qual Z axis ? Centrotecnica (vib)
Live Trays 5 1 Qual Z axis Qual Z axis ? ? Qual Centrotecnica (vib) Alenia (thermal-vac)
Dummy Trays 19 5 vib 19 ther Qual Z axis Qual Z axis ? Qual Centrotecnica (vib) INFN Perugia (in Terni) (thermal)
Tower 1 1 Qual X,Y,Z ? Qual X,Y,Z Qual Alenia