Uploaded image for project: 'Data Management'
  1. Data Management
  2. DM-34854

Support the Rotator Test on Summit Part 4

    XMLWordPrintable

Details

    • 1
    • TSSW Sprint - May 09 - May 23
    • Telescope and Site
    • No

    Description

      Support the rotator test on summit. This is to support the test case by Ander and Doug to debug the rotator's movement.

      The github issue is: negativeMoveOscillations. The branch of Simulink model is issue37.

      There is one test case:
      1. Increase the preloading of the system (3% to ~15 %).

      Note. Ander suggested to try the value of 20%.

      Attachments

        1. data_moog.log
          606 kB
        2. data_moog.mat
          717 kB
        3. data_tekniker_1_5_1_5.log
          538 kB
        4. data_tekniker_1_5_1_5.mat
          637 kB
        5. data_tekniker_3.log
          1.07 MB
        6. data_tekniker_3.mat
          1.27 MB
        7. moog_current.jpg
          moog_current.jpg
          35 kB
        8. tekniker_current_position.jpg
          tekniker_current_position.jpg
          26 kB
        9. tekniker_current.jpg
          tekniker_current.jpg
          29 kB

        Issue Links

          Activity

            ttsai Te-Wei Tsai added a comment - - edited

            Based on Doug:
            I would try to match the moog preload, which is about 0.6A.
            With the present current limit of 4A the preload would be 15%

            ttsai Te-Wei Tsai added a comment - - edited Based on Doug: I would try to match the moog preload, which is about 0.6A. With the present current limit of 4A the preload would be 15%
            ttsai Te-Wei Tsai added a comment -

            The idea from Doug:

            My theory is that the system has a CG out of balance. The torque required to overcome this out of balance is similar to the torque required to overcome the bearings. If you move in the direct of the out of balance the two affects cancel and very little torque is applied. If a drive is in the zero torque phase it becomes unstable as a result of the gap in the gear teeth. If you move in the opposite directly the torque required must overcome both the out of balance and the bearing. This effectively preloads the drives.

            ttsai Te-Wei Tsai added a comment - The idea from Doug: My theory is that the system has a CG out of balance. The torque required to overcome this out of balance is similar to the torque required to overcome the bearings. If you move in the direct of the out of balance the two affects cancel and very little torque is applied. If a drive is in the zero torque phase it becomes unstable as a result of the gap in the gear teeth. If you move in the opposite directly the torque required must overcome both the out of balance and the bearing. This effectively preloads the drives.
            ttsai Te-Wei Tsai added a comment -

            Prepared the test case.

            ttsai Te-Wei Tsai added a comment - Prepared the test case.
            ttsai Te-Wei Tsai added a comment -

            Since the position filter is changed, we found the vibration happens at -1.5 deg to 0 deg now. After we tested the preloading of 15%, we did not see the vibration between 1.5 deg and -1.5 deg. Now, we are intending to try more large range of movements.

            ttsai Te-Wei Tsai added a comment - Since the position filter is changed, we found the vibration happens at -1.5 deg to 0 deg now. After we tested the preloading of 15%, we did not see the vibration between 1.5 deg and -1.5 deg. Now, we are intending to try more large range of movements.
            ttsai Te-Wei Tsai added a comment -

            The comparison of currents between MOOG and Tekniker are:

            ttsai Te-Wei Tsai added a comment - The comparison of currents between MOOG and Tekniker are:
            ttsai Te-Wei Tsai added a comment -

            Please help to review this ticket. Thanks!

            ttsai Te-Wei Tsai added a comment - Please help to review this ticket. Thanks!
            hdrass Holger Drass added a comment -

            Thanks for your support Te-Wei! Great, fast analysis. Look forward to get this solved!

            hdrass Holger Drass added a comment - Thanks for your support Te-Wei! Great, fast analysis. Look forward to get this solved!

            People

              ttsai Te-Wei Tsai
              ttsai Te-Wei Tsai
              Holger Drass
              Holger Drass, Te-Wei Tsai
              Votes:
              0 Vote for this issue
              Watchers:
              2 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved:

                Jenkins

                  No builds found.