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LCLS-II Vibration Study – RSY, Seismometer Measurements. Georg Gassner, April10 th , 2013. QUM. Construction Equipment Run – Sensor Placement. 6. 6. 1. 6. 8. 2. 5. 9. QEM. QT4x. 7. 3. 4. 12. 10. 13. 15. 14. 11. …Jack Hammer …Back Hoe …Concrete Vibrator - PowerPoint PPT Presentation
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LCLS-II Vibration Study – RSY, Seismometer Measurements
Georg Gassner, April10th, 2013
Construction Equipment Run – Sensor Placement
Slide 2
13
1
2
3
4
57
68
6
6
9
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15
QEM
QUM
QT4x
… Jack Hammer … Back Hoe … Concrete Vibrator … Plate Compactor … Core Drilling … Geophone
Construction Equipment Run – Time Table
Task # Task DescriptionStart Time
Duration [minutes]
1 Jack Hammer 8:00 30
2 Back Hoe – scraping asphalt paving 8:30 15
3 Back Hoe – pounding side of hill 8:45 15
4 Concrete Vibrator 9:00 30
5 Plate Compactor 9:30 30
6 Core Drilling – various locations 10:00 30
7 Back Hoe 10:30 30
8 Jack Hammer 11:00 30
Break 11:30 90
9 Jack Hammer 13:00 30
10 Back Hoe – scraping paving 13:30 30
11 Plate Compactor 14:00 30
12 Concrete Vibrator 14:30 30
13 Jack Hammer 15:00 30
14 Core Drilling 15:30 30
15 Back Hoe 16:00 30
Slide 3
Seismometer Sensors - L4C
Slide 4
Sercel L4C Sensors
Sensitivity: 629 Volts / m/sNatural Frequency: ~1Hz
Horizontal sensors on top of:• QT41 QT42 and QT43• QEM1 and QEM2• QUM1 and QUM2
Vertical sensors on top of:• QT41, QT42 and QUM2
Data Acquisition Systems
Slide 5
• Sampling rate: 4096Hz
• System 1 (2 minute datasets):
• National Instruments Model SCC-68 (16 Bits)) • Horizontal sensors
- QT41, QEM2, QUM1 and QUM2
• System 2 (continuous):
• NI Model 9234 (24 Bit) in NI-cRIO9076- All other sensors
Background Noise – One Week of Data
Slide 6
Integrated Motion – Horizontal
Slide 7
Bac
k H
oe
Bac
k H
oe
Bac
k H
oe
Bac
k H
oe
Pla
te C
ompa
ctor
Pla
te C
ompa
ctor
Integrated Motion – Vertical
Slide 8
Bac
k H
oe
Bac
k H
oe
Bac
k H
oe
Bac
k H
oe
Pla
te C
ompa
ctor
Pla
te C
ompa
ctor
Statistical Distribution
• 30 minutes of data split into 10 second intervals
• FFT of all 10 second intervals
• Sorting of values
Slide 9
Results – PSD Back Hoe
Slide 10
Location Main Freq. Side Band
QT41 horizontal 31 Hz 24 Hz
QT42 horizontal 36 Hz 26 Hz
QT43 horizontal 33 Hz 30 Hz
QEM1 horizontal 29 Hz
QEM2 horizontal 33 Hz 30 Hz
QUM1 horizontal 32.5 Hz 38 Hz
QUM2 horizontal 30.5 Hz 34 Hz
Results – PSD QT41H & QT42H
Slide 11
Results – PSD QEM1H & QEM2H
Slide 12
Results – Position Back Hoe
Slide 13
14
Summary and Outlook
• Back Hoe has biggest influence of the construction
equipment tested
• Continuous vibration during Back Hoe operation of
• +/- 0.2µm if back hoe is nearby (<20m)
• At 60m distance from Back Hoe operation
• +/- 0.1µm at QUM and QEM magnets
• Vibration de-correlates quickly after initial trigger
• Outlook:- Observing x-ray beam while artificially vibrating M1H