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PEM (Center)
tatsuki.washimi - 17:15 Sunday 29 March 2020 (13881) Print this report
Shaker injection on the OMC leg

I performed the shaker injection on the OMC leg with my Bluetooth shaker.

(1) 60-1000Hz white noise (diaggui) : start time is 2020-03-29 02:20:20 UTC
(2) 60-200Hz white noise (diaggui): start time is 2020-03-29 02:22:05 UTC

In the second data, we can see many upconversion peaks in DARK, although the accelerometer signal is well cut off at 200Hz.
The peak frequencies (in Hz, less than 1kHz) are below :

184, 
201, 231, 243, 262 274,
335, 385, 
426, 473, 
504, 518, 532, 556, 569, 586,
622, 628, 661, 670,
712, 744, 746, 751, 759, 767, 778, 799,
811, 895,
916, 919, 945, 948, 953,

 

The structure of the DARM spectrum is not similar between shaking and no-shaking data.
So I guess the current vibration of the OMC leg is not a problem.

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shoichi.oshino - 17:16 Sunday 29 March 2020 (13882) Print this report
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tatsuki.washimi - 10:03 Monday 30 March 2020 (13899) Print this report

I applied the PEN injection analysis for the data (1).

Background : 1269483480 - 1269483580
Injected : 1269483634 - 1269483726
Main channel : K1:CAL-CS_PROC_C00_STRAIN_DBL_DQ
PEM channel : K1:PEM-SENSOR_RACK_OMC1_DSUB0_OUT_DQ

Some frequencies (e.g. around 700Hz) are overestimated due to the frequency conversion.

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takaaki.yokozawa - 5:06 Tuesday 31 March 2020 (13910) Print this report

I compared the spectrum during the OMC leg vibration test between (1)silent (2)60-1000Hz vibration (3) 60-200Hz vibration.

As you can see, we can see the resonat frequency for various material (ex. 240Hz, 32-350Hz, 420-440Hz,515-535Hz)

Also, I attached the hammering test for SR2 chamber.

1269485880-1269485980 by Fabian

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