Vibration Measurement at ATF2
21
Vibration Measurement at ATF2 R. Sugahara (KEK) Measured on 17 and 30 June 2008
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Vibration Measurement at ATF2. R. Sugahara (KEK) Measured on 17 and 30 June 2008. X. North. Y. West. Layout. QF17X. QM12FF. Instruments. Seismometers MG-102S of Tokkyokiki Corporation (Accelerometer) Sensible frequency region: 0.1 - 400Hz - PowerPoint PPT Presentation
Transcript of Vibration Measurement at ATF2
Vibration Measurementat ATF2
R. Sugahara (KEK)
Measured on 17 and 30 June 2008
Y
X
West
North
Layout
QM12FFQF17X
Instruments
Seismometers MG-102S of Tokkyokiki Corporation (Accelerometer) Sensible frequency region: 0.1 - 400Hz Resolution: 0.1mGal (Gal = cm/sec2) Sensitivity: 1 Gal/V
Data logger Graduo of Ono Sokki Co., Ltd.
I On concrete blocks
1-1 Concrete Block (---) versus Floor (---)PSD (Power Spectrum Density)
Y (W-E)X (N-S) V
0.1 1 10 100 0.1 1 10 100 0.1 1 10 100
Frequency (Hz)
10-4
10-8
10-12
PS
D (
mm
2/H
z)
1-2 Concrete Block (---) versus Floor (---)Integrated PSD
Y (W-E)X (N-S) V
0.1 1 10 100 0.1 1 10 100 0.1 1 10 100
Frequency (Hz)
10-3
10-6
Inte
g.
PS
D (
mm
)
1-3 PSD RatioConcrete Block / Floor
Frequency (Hz)
QM12
II On magnet without mover
2-1 QF17X (---) versus Floor (---)PSD (Power Spectrum Density)
Y (W-E)X (N-S) V
0.1 1 10 100 0.1 1 10 100 0.1 1 10 100
Frequency (Hz)
10-4
10-8
10-12
PS
D (
mm
2/H
z)
2-2 QF17X (---) versus Floor (---)Integrated PSD
Y (W-E)X (N-S) V
0.1 1 10 100 0.1 1 10 100 0.1 1 10 100
Frequency (Hz)
10-3
10-6
Inte
g.
PS
D (
mm
)
2-3 PSD RatioQF17X (no mover) / Floor (---)
Frequency (Hz)
III On magnet with mover
3-1 QM12 (---) versus Floor (---)PSD (Power Spectrum Density)
Y (W-E)X (N-S) V
0.1 1 10 100 0.1 1 10 100 0.1 1 10 100
Frequency (Hz)
10-4
10-8
10-12
PS
D (
mm
2/H
z)
3-2 QM12 (---) versus Floor (---)Integrated PSD
Y (W-E)X (N-S) V
0.1 1 10 100 0.1 1 10 100 0.1 1 10 100
Frequency (Hz)
10-3
10-6
Inte
g.
PS
D (
mm
)
3-3 PSD RatioQM12 (with mover) / Floor
Frequency (Hz)
QM12
Summary1. On the concrete base block • Amplification factor is quite small in the frequency region less than 40Hz, especially in vertical direction
2. On the top of the magnet without mover, QF17X • There are resonances at 35Hz in X direction, and at 55Hz in Y • No obvious resonance is observed in V direction • Amplification factor is about 100 in amplitude at X and Y resonance peaks • Out of resonance region, amplification factor is about 3 or less in the frequency region higher than 15Hz in X and Y direction • Amplification factor is less than 2 in the frequency region less than 15Hz. Especially it is quite small in V direction in the frequency region less than 50HZ
Summary (cont.)3. On the top of the magnet with mover, QM12FF • There are resonances at 20Hz in X and Y direction, and at 70Hz in V • Amplification factor is about 100 in amplitude at resonance peaks • Out of resonance region, amplification factor is about 3 or less in the frequency region 10 - 45Hz in X and Y direction • Amplification factor is less than 2 in the frequency region less than 10Hz • Especially it is quite small in V direction in the frequency region less than 40HZ except for a small resonance at 21Hz, where the amplification factor is about 3
4. Integrated amplitude (nm) 1Hz X Y V ; 10Hz X Y V ; 20Hz X Y V Floor 60 60 80 ; 06 08 15 ; 02 2.3 03 QF17X 60 60 80 ; 20 17 15 ; 20 15 04 --- Floor 40 40 40 ; 09 04 12 ; 3.4 1.8 4.5 QM12FF 90 55 40 ; 80 30 15 ; 80 12 09
< --- >
1b-1 Concrete Block (---) versus Floor (---)PSD (Power Spectrum Density)
Y (W-E)X (N-S) V
0.1 1 10 100 0.1 1 10 100 0.1 1 10 100
Frequency (Hz)
10-4
10-8
10-12
PS
D (
mm
2/H
z)
1b-2 Concrete Block (---) versus Floor (---)Integrated PSD
Y (W-E)X (N-S) V (W-E)
0.1 1 10 100 0.1 1 10 100 0.1 1 10 100
Frequency (Hz)
10-3
10-6
Inte
g.
PS
D (
mm
)
1b-3 PSD RatioConcrete Block / Floor
Frequency (Hz)
