Ushiba, YamaT, Akutsu
Comparing the measured suspension responses of MCo used in the acceptancce check the other day and the rececnt one, we found a big differenec of the pitch repsonse! Seems severe, and needs inspection!!
In the mid-night, we tried to play with the IMC ASC. Firstly, we enjoyed looking at the input and output signals from some filters while engaging the ASC loops one by one ... but immediately we found a strange behavior of the MCi pitch by comparing with the MCo pitch; seems the actuator gains are too much (~20 times) different. It would be too much. So we looked for the past result in the acceptance check the other day (Fig. 1), and compared it with the recent one (Fig. 2). As you can see, apparently the MCo pitch repsonses have differed much! So strange...
- Hmm, rather, maybe the fact would be, MCi response has been too low from the first???
- Yaw seems not changed. So simple coil failuers would not explain the things well....
- Any other?