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Entry  Wed Nov 21 09:59:26 2018, gautam, Update, LSC, LSC feedforward block diagram IMG_7173.JPG
    Reply  Fri Nov 30 19:37:47 2018, gautam, Update, LSC, LSC feedforward block diagram LSC_FF_tester.pngScreenshot_from_2018-11-30_19-41-07.pngScreenshot_from_2018-12-10_15-31-23.pngSimLSC.png
       Reply  Mon Dec 10 15:53:16 2018, gautam, Update, LSC, Swept-sine measurement with DTT SimTF.pdf
Message ID: 14326     Entry time: Fri Nov 30 19:37:47 2018     In reply to: 14313     Reply to this: 14339
Author: gautam 
Type: Update 
Category: LSC 
Subject: LSC feedforward block diagram 

I wanted to set up an RTCDS model to understand this problem better. Attachment #1 is the simulink diagram of the signal flow. The idea will be to put in the appropriate filter shapes into the various filter blocks denoting the DARM and auxiliary DoF plants, controllers and actuators, and then use awggui / diaggui to inject some noises and see if in this idealized model I can achieve good subtraction. Then we can build up to applying a time varying cross coupling between DARM and the vertex DoF, and see how good the adaptive FF works. Still need to setup some MEDM screens to make working with the test system easier.

I figured c1omc would be the least invasive model to set this upon without risking losing any of our IR/green alignment references. Compile and install went smooth, see Attachment #2. The c1omc model was clocking 4us before, now it's using 7us.

Attachment #3 shows the top level of the OMC model, while Attachment #4 shows the MEDM screen.

* Note to self: when closing a loop inside the realtime model, there has to be a delay block somewhere in the loop, else a compilation error is thrown.

Attachment 1: LSC_FF_tester.png  71 kB  | Hide | Hide all
Attachment 2: Screenshot_from_2018-11-30_19-41-07.png  23 kB  | Hide | Hide all
Attachment 3: Screenshot_from_2018-12-10_15-31-23.png  119 kB  Uploaded Mon Dec 10 15:31:52 2018  | Hide | Hide all
Attachment 4: SimLSC.png  9 kB  Uploaded Mon Dec 10 22:13:31 2018  | Hide | Hide all
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