Reports 1-1 of 1 Clear search Modify search
PEM (Center)
tatsuki.washimi - 17:26 Wednesday 15 May 2024 (29515) Print this report
OMC Hammering for Table&Base

[Takano, Washimi]

We performed a hammering test for the OMC stack (-X side), the same measurements and analysis as the IFI work (klog29482)
(See also the previous test, klog29310 )

  • optical table -> optical table
  • base plate -> optical table
  • nothing -> optical table (as a reference)
  • base plate -> base plate (2 sets)
  • ground -> base plate (2 sets)
Images attached to this report
Comments to this report:
tatsuki.washimi - 17:47 Wednesday 15 May 2024 (29516) Print this report

I compared the TF from Base acceleration -> Table acceleration between the OMC (5/15) and the IFI(5/2).

The result shows:

  • Horizontal: the difference is not clear. (IFI is larger in the X-direction below 50Hz?)
    • note that the tapping direction is vertical.
  • Vertical:
    • below 130Hz: IFI had a larger amplitude.
    • 130-180Hz: almost same
    • over 180Hz: OMC had a larger amplitude. (bad coherence at IFI)

 

Images attached to this comment
tatsuki.washimi - 12:00 Thursday 16 May 2024 (29532) Print this report

I compared the recent results to the TAMA paper (Rev. Sci. Instrum. 73, 2428–2433 (2002)).
They are quite different...

I wonder whether our measurements and analysis are appropriate or not. 
It might be necessary to locate sensors both on a base and a table simultaneously.

Images attached to this comment
Search Help
×

Warning

×