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keiko.kokeyama - 20:39 Saturday 19 March 2016 (1098) Print this report
PR3, MCO, MCE pitch had drift during last night

[Miyakawa, Kokeyama]

 

Miyakawa san found that MC_TRANS power was much lower in this morning. He found that MCO_PIT, MCE_PIT and PR3_PIT&YAW were drifting all the night for about 15 hours. 4urad and 2 urad moved in pitch for MCO and MCE, respectively. 10urad for PR3 PIT, 30urad for PR3 YAW moved, respectively.

 

Looking at the dataviewer, the starting time of the drifts is almost the same and sudden for the all (around 3/18 18:00 JST). 

 

We looked the temperature data (K1:PEM-TEMPERATURE_FIELD_MC_RACK, attached temperature.png) but there is no significant correlation. We have no idea what can cause such ground(?) motion.

 

Miyakawa san re-aligned all three MC suspension in the morning (the last jumps in each dataviewer plots). So MC_TRANS power was restored same as before.

Images attached to this report
Comments to this report:
shinji.miyoki - 23:06 Tuesday 22 March 2016 (1149) Print this report
I guess this drift was due to the air pressure change. Look the attached air pressure data in march 18th in Takayama-city. The trend and some details matche with this MC drift trend.
Non-image files attached to this comment
keiko.kokeyama - 23:20 Tuesday 22 March 2016 (1150) Print this report

Can it be? It started happening again at around 3pm today (log 1145). I suppose it's still happening. Could you get the air pressure data for this one too?

kazuhiro.yamamoto - 23:46 Tuesday 22 March 2016 (1151) Print this report
This graph suggests that the weather on that day was terrible. Was it so around Mozumi ?
shinji.miyoki - 23:47 Tuesday 22 March 2016 (1152) Print this report
Today's data will be listed in the next day in the HP, maybe.

http://www.data.jma.go.jp/obd/stats/etrn/index.php?prec_no=52&block_no=47617&year=2016&month=3&day=18&view=
shinji.miyoki - 23:51 Tuesday 22 March 2016 (1153) Print this report
Maybe there was rapid and drastic change of condition.

http://www.data.jma.go.jp/obd/stats/etrn/view/hourly_s1.php?prec_no=52&block_no=47617&year=2016&month=3&day=18&view=

Especially, an amazing temperature change around 9~10 am. The wether changed from fine in the morning, cloudy in the afternoon and rainy in the night. Another temp change happened around 19.
keiko.kokeyama - 0:04 Wednesday 23 March 2016 (1155) Print this report

But our many temperature sensors in the tunnel did not show any change in the mine. See the original post, temperature graph for 24h is shown. According to our sensors, even the center area is not affected by the outside temperature at all. They don't see night/day change in general. The temperature seems to depend only on the consuming power INSIDE the mine. 

Air pressure change may be more reasonable.

osamu.miyakawa - 2:22 Wednesday 23 March 2016 (1158) Print this report

This is a 10 days data. Big jumps 4-days ago and the last evening mean re-alignments to compensate the big drifts. Kokeyama-san reported already, steep drift started yesterday 3PM and still it lasts. It seems to be going one way.

Miyoki-san, can you compare this longer scale data with weather data?

Images attached to this comment
shinji.miyoki - 22:16 Wednesday 23 March 2016 (1170) Print this report

I made an air pressure data in Takayama-city from March 15th to 23rd. The data from 15th to 19th seems to be similar trend with the MC drift ? On the other hand, the data ftom 20th to 23rd seems not to be similar with the MC drift, except for a drastic change around 12pm in 22nd. I think the drastic down of pressure in 22nd can explain the drift of MC that was reported in the previous post.

Non-image files attached to this comment
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