Reports 1-1 of 1 Clear search Modify search
PEM (Center)
takaaki.yokozawa - 6:50 Wednesday 17 May 2023 (25266) Print this report
Acoustic injection test at OMC area
I performed the acoustic injection test at OMC area.

05:28:28 - 06:02:00 (JST)
70 -900 Hz with 10 Hz resolution
100 count injection
10 s in each frequency

Side band like signals +/- 90 Hz?
Several excitation in several frequencies
Images attached to this report
Comments to this report:
takaaki.yokozawa - 6:52 Wednesday 17 May 2023 (25267) Print this report
06:02:43 - 06:34:00 (JST)
50 -200 Hz with 1 Hz resolution
100 count injection
10 s in each frequency
Images attached to this comment
takaaki.yokozawa - 7:51 Wednesday 17 May 2023 (25268) Print this report
07:20:23 - 07:40400 (JST)
85 -95 Hz with 0.1 Hz resolution
100 count injection
10 s in each frequency
Images attached to this comment
takaaki.yokozawa - 8:06 Wednesday 17 May 2023 (25269) Print this report
07:41:06 - 08:01:20 (JST)
800 -900 Hz with 1 Hz resolution
100 count injection
10 s in each frequency
Images attached to this comment
tatsuki.washimi - 19:18 Wednesday 17 May 2023 (25274) Print this report

I analyzed the 70 -900 Hz injection data.

(The frequency resolution is set to the injection resolution)

Images attached to this comment
Non-image files attached to this comment
tatsuki.washimi - 13:41 Thursday 18 May 2023 (25278) Print this report

I update my analysis:

  • The projections for each injection frequency are performed with the frequency resolution corresponding to the fft-length (2s in this case)
  • The summation of the projected noise is shown with the frequency resolution corresponding to the injection resolution (5Hz in this case)
  • Around the moving lines are masked.
Images attached to this comment
Non-image files attached to this comment
tatsuki.washimi - 14:19 Thursday 18 May 2023 (25282) Print this report

I also analyzed the following data:

06:02:43 - 06:34:00 (JST)
50 -200 Hz with 1 Hz resolution
100 count injection
10 s in each frequency

The remarkable frequencies are 87Hz, 91Hz, 95Hz, 190Hz (see the PDF file).

Images attached to this comment
Non-image files attached to this comment
tatsuki.washimi - 14:42 Thursday 18 May 2023 (25283) Print this report

I also analyzed the following data:

07:41:06 - 08:01:20 (JST)
800 -900 Hz with 1 Hz resolution
100 count injection
10 s in each frequency

The remarkable frequencies are 814Hz, 823Hz, 841Hz,  855Hz, and 889Hz (see the PDF file).

Images attached to this comment
Non-image files attached to this comment
Search Help
×

Warning

×