Similar work with klog25813 and klog25877.
To identified the reesonance of Type-B suspensions, I injected white noise from 10 Hz to 60 Hz at IM stage of Type-B suspensions and measured the spectra of each sensor.
Data are stored at /users/Commissioning/data/VIS/{BS,SR2,SR3}/2023/{0711,0713}/.
I will summarize the results and upload them on JGWdoc soon.
I summarized the results and uploaded it on JGWdoc.
https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=15073
I'm not sure why but there are many peaks in BS, which cannot be seen in SR2 and SR3.
So, it is better to compare the measurement with suspension models at some point.
On the DARM sensitivity, only 17.187Hz (17.19Hz by SR3_V_2nd) and 55.200Hz (55.22Hz by SR2_R_4th)
can be seen within 10mHz difference from the list in JGW-T2315073-v1 as shown in Fig.1 and Fig.2, respectively.
Figure 1 says 16.257Hz is also matched with SR3_R_1st (16.27Hz), but it seems an accidental match of frequency
because band width is quite different from the original measurement by Ushiba-kun as shown in Fig.3.
