Transcript EM Test Plans - Istituto Nazionale di Fisica Nucleare

GLAST LAT Project
GSFC, October 2003
GLAST Large Area Telescope:
Tracker Subsystem
Gamma-ray Large
Area Space
Telescope
Status of the
EM Vib Tests
INFN - Bari
LAT-PR-0XXXX
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GLAST LAT Project
Outline
GSFC, October 2003
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
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Reference LAT Documents:
1. LAT-MD-00408, LAT Instrument Performance Verification Plan
2. LAT-SS-00788, LAT Environmental Specification
3. LAT-TD-01005, Thermal Test Results on Thick Converter Mock-up Trays
4. LAT-TD-01249, Thermal Test Results for Pre-Engineering Model Trays
5. LAT-PS-01584, LAT Tracker Tray SSD Ladder Panel Assembly Procedure
6. LAT-TD-01004, EM Tray Vibration Test Plan
7. LAT-TD-01037, EM Tray Thermal Test Plan
LAT-PR-0XXXX
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GLAST LAT Project
EM Tray vib levels
GSFC, October 2003
White Noise
Sine sweep
Frequency
range
20  2000 Hz
Sweep rate
2 oct/min
Target
Amplitude
0.5 / 0.25 g0-pk
Frequency
(Hz)
ASD WN
Level(g2/Hz)
Overall
grms
Duration
(min)
20 ÷ 2000
10-4
0.45
1
Random vibration
Frequency
(Hz)
LAT-PR-0XXXX
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
3
GLAST LAT Project
Tray vib set up
W side on the top
GSFC, October 2003
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 Lshaped 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
LAT-PR-0XXXX
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EM Tray vib sequence thrust
axis
GLAST LAT Project
Step
Description
GSFC, October 2003
Test
Level
1
Fixture, tray and
accelerometers mounting
2
Fixture calibration and tray
resonance search
Sine sweep
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
11
Dismounting
12
Test completion
LAT-PR-0XXXX
0.25 g
0.25 g
0-pk
0-pk
5
GLAST LAT Project
GSFC, October 2003
EM Trays: some results (1)
Sine sweep before/after random
Random vibration + White noise
Z accelerometer response
X accelerometer response
Y accelerometer response
LAT-PR-0XXXX
Resonance search:
Resonance check:
0= 815 Hz, Q  51
0= 809 Hz, Q  49
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GLAST LAT Project
GSFC, October 2003
EM Trays: some results (2)
Light
≈ 1000Hz
≈ 660Hz
≈ 800Hz
Heavy tray
Mid tray
LAT-PR-0XXXX
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GLAST LAT Project
GSFC, October 2003
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”
“Watch-dog”
Input-notched: 13.6 grms
Output-notched: 59.6 grms
LAT-PR-0XXXX
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GLAST LAT Project
EM Trays: summary
Vib test pass criteria: / < 5%
GSFC, October 2003
All trays first mode
› 500 Hz
/ < 2%
530
LAT-PR-0XXXX
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GLAST LAT Project
GSFC, October 2003
EM Tower vib levels
Sinusoidal vibration
Modal survey
Frequency range
20  2000 Hz
Sweep rate
2 oct/min
Input Amplitude
0.15 g0-pk
Alarm Levels
± 1 dB
Upper Abort Level
0.25 g0-pk
Lower Abort Level
- 2 dB
LAT-PR-0XXXX
Sine burst: quasi static test@25Hz
TKR
Acceptance (g)
Qualification (g)
Lateral (X)
 3.7
 4.6
Lateral (Y)
 3.7
 4.6
Axial (Z)
 6.8
 8.5
Random vibration: new level
10
GLAST LAT Project
GSFC, October 2003
Tower vib set up:
Accelerometer.
#
Sidewall
Tray #
Location
Read-out
axis
1
+X
19 (top)
+x, -y corner
x
2
+X
19 (top)
+x, +y corner
z
3
+X
19 (top)
+x, +y corner
x
4
+X
10
Center of structural close-out
x
5
+X
1 (bottom)
+x, +y corner
z
6
+X
1 (bottom)
+x, +y corner
x
7
+Y
19 (top)
+y, -x corner
y
8
+Y
10
Center of thermal boss
y
9
+Y
1 (bottom)
+y, -x corner
z
10
+Y
1 (bottom)
+y, -x corner
y
11
-X
10
Center structural close-out
x
12
-Y
10
Center of thermal boss plane
y
13
-
19 (top)
Center of the top side of the top tray
z
14
-
1 (bottom)
Bottom side of the bottom tray near the +x, -y corner
x
15
-
1 (bottom)
Bottom side of the bottom tray near the +x, +y corner
y
16
-
1 (bottom)
Center of the bottom side of the bottom tray
z
Accelerometer locations
LAT-PR-0XXXX
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GLAST LAT Project
GSFC, October 2003
Accelerometers location
13
1
7
2
3
12
11
8
4
14
9
16
5
15
10
6
LAT-PR-0XXXX
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GLAST LAT Project
GSFC, October 2003
Fixture calibration
LAT-PR-0XXXX
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GLAST LAT Project
GSFC, October 2003
EM Tower vib sequence X,Y,Z axis
For each axis
Run #
Test Description
Frequency
1
Modal survey
Input: 0.15 g (20 – 2000 Hz)
2
Sinusoidal vibration
5 – 50 Hz
3
Modal survey
Input: 0.15 g (20 – 2000 Hz)
4
Random Vibration (-6 dB)
Input 20 – 2000 Hz
5
Modal survey
Input: 0.15 g (20 – 2000 Hz)
6
Random Vibration (- 3 dB)
Input: 20 – 2000 Hz
7
Modal survey
Input: 0.15 g 20 – 2000 Hz
8
Random Vibration (Full level)
Input: 20 – 2000 Hz
9
Modal survey
Input: 0.15 g (20 – 2000 Hz)
10
Random Vibration (Full level)
Input: 20 – 2000 Hz
11
Modal survey
Input: 0.15 g (20 – 2000 Hz)
12
Sine burst (1/4 level)
25 Hz
5 cycles
13
Sine burst (1/2 level)
25 Hz
5 cycles
14
Sine burst (full level)
25 Hz
5 cycles
15
Modal Survey
Input: 0.15 g (20 – 2000 Hz)
LAT-PR-0XXXX
Comments
Qual level
1 min duration
1 min duration
1 min duration
2 min duration
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GLAST LAT Project
EM matrix
1
Qual
Z axis
Dummy
Trays
19
5 vib
19 ther
Qual
Z axis
Tower
1
1
Qual
X,Y,Z
Qual
X,Y,Z
Test site
5
Thermal Vacuum
Live
Trays
Thermal balance
Qual
Z axis
Thermal Cycle
24
Functional
24
Sinusoidal vibration
Random Vibe + modal
survey
Sine burst (static
equivalent acceleration)
Quantity to test
Quantity
Item
Panels
LAT-PR-0XXXX
GSFC, October 2003
Centrotecnica (vib)
Qual

Qual
Qual
X,Y,
Z
Centrotecnica (vib)
Alenia (thermal-vac)
Centrotecnica (vib)
INFN Perugia (in
Terni) (thermal)

Qual
Italy
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GLAST LAT Project
GSFC, October 2003
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 …
LAT-PR-0XXXX
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GLAST LAT Project
GSFC, October 2003
Flight units
• New random level: Qual tower  Protoflight tower
• Trays tower A vib level?
• Trays flight vib level?
LAT-PR-0XXXX
17
GLAST LAT Project
GSFC, October 2003
Towers: random levels
Old levels
(general GEVS levels)
Tower A
Trays for tower A
Towers 1-16
Trays for towers 1-16
LAT-PR-0XXXX
New levels
Qualification
Workmanship
(12.3 grms, 2 min)
(6.8 grms, 1 min)
Qualification
Qualification ??
(14 grms, 2 min)
(14 grms, 2 min)
Acceptance
Workmanship
(8.7 grms, 1 min)
(6.8 grms, 1 min)
Acceptance
Acceptance ??
(10 grms, 1 min)
(10 grms, 2 min)
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GLAST LAT Project
GSFC, October 2003
Tray assembly&test sequence
Tray factory (panels)
Vibration test
Plyform
Ladder factory
Centrotecnica
Vacuum bakeout
Roma
G&A
Mipot
Electrical test
Tray assembly: ladders and MCMs
on trays
G&A
Fast electrical test*
Thermal cycles
Stacked cosmic rays*
* Live trays
LAT-PR-0XXXX
Tower assembly
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