# Support the Rotator Test on Summit Part 6

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#### Details

• Type: Story
• Status: Done
• Resolution: Done
• Fix Version/s: None
• Component/s:
• Labels:
• Story Points:
2
• Sprint:
TSSW Sprint - Jun 6 - Jun 20, TSSW Sprint - Jun 20 - Jul 04
• Team:
Telescope and Site
• Urgent?:
No

#### Description

Support the rotator test on summit. This is to collect the data of controller parameters.

Check there is the “forced oscillation” in the rotator or not. If it is, the oscillation frequency will change with speed. Therefore, measure the oscillation frequency at each speed and check if it is related to something, for example:

1. Rotation speed of the motor, of the pinion or of the crown
2. Rotation speed of the pinion or crown multiplied by their number of teeth…

If it is, we should review mechanically the source of the oscillation because the controller is simply reacting to that oscillation (trying to eliminate it).

#### Attachments

1. analysis_fail
802 kB
2. moog_big.png
124 kB
3. moog_small.png
120 kB
4. test_record.txt
4 kB

#### Activity

Hide
Te-Wei Tsai added a comment - - edited

I noticed that I have the data of MOOG's tracking result at 3/28:

 time_start = Time("2022-03-28T17:27:05", scale="utc", format="isot") time_end = Time("2022-03-28T17:27:30", scale="utc", format="isot") 

The result is:

Check the checking target from 0.7 degree to 1.5 degree with the velocity of 0.068 degree/second:

The maximum of position error is 13.388 arcsec and the RMS is 3.783 arcsec.

Under the same condition, the Tekniker controller can reach the results that the maximum of position error is 0.787 arcsec and the RMS is 0.258 arcsec already.

Show
Te-Wei Tsai added a comment - - edited I noticed that I have the data of MOOG's tracking result at 3/28: time_start = Time( "2022-03-28T17:27:05" , scale = "utc" , format = "isot" ) time_end = Time( "2022-03-28T17:27:30" , scale = "utc" , format = "isot" ) The result is: Check the checking target from 0.7 degree to 1.5 degree with the velocity of 0.068 degree/second: The maximum of position error is 13.388 arcsec and the RMS is 3.783 arcsec. Under the same condition, the Tekniker controller can reach the results that the maximum of position error is 0.787 arcsec and the RMS is 0.258 arcsec already.
Hide
Te-Wei Tsai added a comment -

The test had been postponed to the next Thursday (6/23).

Show
Te-Wei Tsai added a comment - The test had been postponed to the next Thursday (6/23).
Hide
Te-Wei Tsai added a comment - - edited

Need to analyze the data: analysis_fail

This is the binary file that I recorded the condition that the rotator can not do the tracking at the second time of test.

Show
Te-Wei Tsai added a comment - - edited Need to analyze the data:  analysis_fail This is the binary file that I recorded the condition that the rotator can not do the tracking at the second time of test.
Hide
Te-Wei Tsai added a comment -

Test records: test_record.txt

Show
Te-Wei Tsai added a comment - Test records: test_record.txt
Hide
Te-Wei Tsai added a comment -
Show
Te-Wei Tsai added a comment - Please review the PR: https://github.com/lsst-ts/ts_notebooks/pull/89 Thanks!
Hide
Holger Drass added a comment -

Thanks, Te-Wei! Great work in the very cold!

Show
Holger Drass added a comment - Thanks, Te-Wei! Great work in the very cold!

#### People

Assignee:
Te-Wei Tsai
Reporter:
Te-Wei Tsai
Reviewers:
Holger Drass
Watchers:
Holger Drass, Te-Wei Tsai