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Date |
Author |
Type |
Category |
Subject |
Text |
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16
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Mon Jun 10 18:37:09 2013 |
Matt A. | General | General | Response to question in: Disscussion of the code of a 'comsol with matlab' model file (partially complete). |
trange = ['range(0,' num2str(dt)
',' num2str(t_end) ')']; |
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17
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Tue Jun 11 10:21:05 2013 |
Deep Chatterjee | General | General | Re: Disscussion of the code of a 'comsol with matlab' model file |
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18
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Tue Jun 11 17:04:33 2013 |
Deep Chatterjee | General | General | Analyzing the file 'thermo_refractive_COMSOL_1D_axisymmetric' by Koji Arai | The file 'thermo_refractive_COMSOL_1D_axisymmetric.m'
found in the SVN repository https://nodus.ligo.caltech.edu:30889/svn/trunk/comsol/thermo-refractive/ |
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19
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Wed Jun 12 13:52:44 2013 |
Deep Chatterjee | Optics | General | Difference in COMSOL and Analytic solution for TR noise | In this post, I am reporting of the relative
difference between the analytic and COMSOL
results. |
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20
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Mon Jun 17 11:06:17 2013 |
Emory Brown | General | General | Plans for the week of 6-17-13 through 6-22-13 | This week I will update my previous eLog
entry with a nicely labeled plot showing
both lines on the same plot, then I intend |
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21
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Mon Jun 17 14:59:20 2013 |
Emory Brown | Optics | General | Improved Meshing in a COMSOL Model | In order to make computations more efficient
and possibly allow the set of boundary conditions
based on Liu and Thorne's suggestion of a |
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22
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Tue Jun 18 15:26:50 2013 |
Emory Brown | Optics | General | Attempting to Implement Liu and Thorne's Boundary Conditions | Liu and Thorne demonstrated in their paper
that the optimal set of boundary conditions
for a problem like the one I am working on |
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23
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Wed Jun 19 14:59:13 2013 |
Emory Brown | General | General | The Relative Residual Convergence Error | We have been encountering an error
in COMSOL for a while of the form "Failed
to find a solution.; The relative residual |
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24
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Thu Jun 20 10:26:38 2013 |
Matt A. | General | General | The Relative Residual Convergence Error | Emory:
I don't understand how you're getting
the strain energy from the eigenvalue solver. |
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25
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Thu Jun 20 12:41:01 2013 |
Deep Chatterjee | General | General | The expression for the "work dissipated" in the TE and TR noise calculations | While discussing TE noise with Yanbei Chen,
it was realized that the expression for the
work dissipated W_diss was derivable from |
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26
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Thu Jun 20 12:51:44 2013 |
Emory Brown | General | General | The Relative Residual Convergence Error | I used the same integrator that we had
setup for use with the stationary solver.
I had expected it to either fail or |
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27
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Thu Jun 20 16:29:38 2013 |
Deep Chatterjee | Optics | General | Differences on using a coarser mesh in calculating TR noise | In the code for evaluating TR noise, the
parameter for automatic meshing (which can
take values from 1 to 9 - 1 being the |
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28
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Sun Jun 23 14:00:05 2013 |
Emory Brown | General | General | Manipulating the Relative Tolerance | We have been seeing an error when
attempting to use a stationary solver in
conjunction with a set of boundary conditions |
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29
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Sun Jun 23 14:29:04 2013 |
Koji | Optics | General | Differences on using a coarser mesh in calculating TR noise | What about the dependence on the size of
the time slice?
It is unclear what the unit fo the |
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30
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Mon Jun 24 16:02:43 2013 |
Emory Brown | Optics | General | Rebuilding a minimal version of our COMSOL model | I rebuilt our COMSOL model in order
to see if I could find any errors in it and
to clean out unnessesary features and parameters. |
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31
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Mon Jun 24 18:00:26 2013 |
Deep Chatterjee | Optics | General | The problem of TE Noise calculation for a beam passing through a cylindrical substrate | In this post, I mention of my immediate
plan for the week and also describe the problem
I am looking at in brief. |
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32
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Tue Jun 25 15:16:59 2013 |
Arnaldo Rodriguez | Optics | General | Setting Up Looped Simulation for PID Controller | After setting up a COMSOL model that includes
the heat flux from the laser and the ring
heater, I've made the model solve over time |
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33
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Tue Jun 25 15:18:41 2013 |
Emory Brown | Optics | General | A new boundary condition to attempt to avoid the relative residual error | I contacted COMSOL support about
our difficulties with the relative residual
error and was told "Typically for solid |
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34
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Wed Jun 26 13:52:06 2013 |
Arnaldo Rodriguez | Optics | General | Verifying Relative Error in Defocus for Regular and Manual-Loop Simulations | To verify the validity of the solutions
produced by the manual simulation, I've calculated
the relative error between the results from |
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35
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Wed Jun 26 15:23:55 2013 |
Arnaldo Rodriguez | Optics | General | Solving Time per Loop in Manual Dynamic Simulation | I've attempted to determine the solving
time per loop as a function of the simulation
time, in an attempt to identify any trends |
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36
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Wed Jun 26 16:46:32 2013 |
Emory Brown | Optics | General | A convergent stationary solution | By adding additional constraints
as described in the previous eLog to the
model I was able to get a convergent solution |
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37
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Thu Jun 27 11:26:18 2013 |
Emory Brown | Optics | General | Missing factor of 4 and a comparison of analytic and simulated Brownian noise | |
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38
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Thu Jun 27 15:06:13 2013 |
Arnaldo Rodriguez | Optics | General | PID Function in Manual Simulation | I have inserted a rudimentary PID
function into the manual simulation code
as a way to test whether or not the PID function |
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39
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Thu Jun 27 17:12:33 2013 |
Arnaldo Rodriguez | Optics | General | Defocusing in P-Controlled Manual Simulation | To test the effectiveness of the
PID loop, I've only given a nonzero value
to the K_p constant and varied it over a |
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40
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Fri Jun 28 11:54:10 2013 |
Emory Brown | Optics | General | Maintaining a constant volume while modifying the radii of the test mass faces | When changing the dimensions of the
mirror, we want to keep a constant volume.
To do so, we must modify the height of the |
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41
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Fri Jun 28 14:03:07 2013 |
Deep Chatterjee | General | General | Approach for TE noise for beam in cavity | In this post I mention of the approach
that would be taken to solve for the TE noise
spectrum for a beam inside the substrate |
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42
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Mon Jul 1 13:01:58 2013 |
Arnaldo Rodriguez | Optics | General | Brief Parameter Study on P-active Control Loop | The following is a plot of the defocus
as a function of time with only the proportional
gain being nonzero. Only three cases were |
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43
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Mon Jul 1 17:31:40 2013 |
Arnaldo Rodriguez | Optics | General | Parameter Study on Sampling Time for P-active Loop | The following is a plot of the defocus
as a function of time for a fixed proportionality
gain of 150, and different listed sampling |
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44
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Tue Jul 2 13:32:30 2013 |
Emory Brown | Optics | General | Using Matlab to run our COMSOL simulations | We want to be able to test a number
of values for the ratio of the radii of the frustum
which will be much easier once we can get |
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45
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Wed Jul 3 00:04:46 2013 |
Koji | Optics | General | Using Matlab to run our COMSOL simulations | Please use zipped files instead of uploading
extremely long text files on the elog.
Or use wiki or svn instead of elog |
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46
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Thu Jul 4 15:23:47 2013 |
Deep Chatterjee | Optics | General | Attempt to compute TE noise following Liu and Thorne | Liu and Thorne, in their paper have analytically
solved for the TE noise spectra considering
the test mass to be a half infinite space. |
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47
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Fri Jul 5 14:06:24 2013 |
Deep Chatterjee | Optics | General | Attempt to compute TE noise following Liu and Thorne |
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48
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Mon Jul 8 15:47:23 2013 |
Emory Brown | Optics | General | Meshing error when varying geometry | I attempted to run the Matlab code
built last week, but received an error that
the mesh failed to generate on the inner |
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49
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Mon Jul 8 18:39:31 2013 |
Matt A. | Optics | General | Meshing error when varying geometry |
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50
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Mon Jul 8 19:04:35 2013 |
Matt A. | Optics | General | Meshing error when varying geometry |
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51
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Tue Jul 9 14:45:04 2013 |
Emory Brown | Optics | General | Meshing error when varying geometry | I tried removing the constraints and applied
force and was able to get close to the same
frequencies for the butterfly modes as the |
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52
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Wed Jul 10 14:15:20 2013 |
Emory Brown | Optics | General | Comparison of Umax and the frequency of the lowest eigenmode against ratioR | I was able to run the looper program
designed last week over the interval ratioR=[0.5,
0.9] with a step size of 0.01 and obtained |
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53
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Wed Jul 10 17:52:18 2013 |
Koji | General | General | How to force time steps for a time dependent simulation | A common trap in COMSOL:
When you run a time series simulation,
COMSOL tries to be "clever" by |
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54
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Thu Jul 11 19:16:12 2013 |
Deep Chatterjee | General | General | TE noise problem - Matlab script | The present aim is the calculation of the
TE noise like Liu and Thorne. Although, the
results of Liu and Thorne are for the case |
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55
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Fri Jul 12 00:09:17 2013 |
Emory Brown | Optics | General | Analysis of substrate Brownian noise in a silicon test mass with changing ratioR value | I performed the same analysis we
previously did on a test mass made of silicon
(using the built-in silicon within COMSOL) |
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56
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Fri Jul 12 00:31:11 2013 |
Emory Brown | Optics | General | Reversed face mirror design | We had noticed that when we ran an
eigenfrequency analysis, there was often
a node (see attached screenshot) on the face |
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57
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Fri Jul 12 19:43:32 2013 |
Deep Chatterjee | General | General | TE noise problem - Matlab script |
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58
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Sun Jul 14 15:13:46 2013 |
Deep Chatterjee | General | General | TE noise problem - Matlab script |
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59
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Mon Jul 15 13:14:30 2013 |
Emory Brown | Optics | General | Umax curves for varying height test masses | I ran sweeps over the ratioR range
from 0.5 to 0.9 for test masses with modified
height, and thus mass, which were otherwise |
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60
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Mon Jul 15 16:05:29 2013 |
Deep Chatterjee | General | General | TE noise problem - Matlab script |
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61
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Tue Jul 23 18:26:04 2013 |
Deep Chatterjee | Optics | General | Comparison between Liu and Thorne Results and COMSOL results for TE noise | In this post I report of the results of
TE noise simulated by COMSOL for the TE noise
of Infinite test masses. |
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67
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Tue Jul 23 20:53:37 2013 |
Deep Chatterjee | Optics | General | Comparison between Liu and Thorne Results and COMSOL results for TE noise |
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66
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Tue Jul 23 20:53:37 2013 |
Deep Chatterjee | Optics | General | Comparison between Liu and Thorne Results and COMSOL results for TE noise |
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65
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Tue Jul 23 20:53:37 2013 |
Deep Chatterjee | Optics | General | Comparison between Liu and Thorne Results and COMSOL results for TE noise |
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64
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Tue Jul 23 20:53:37 2013 |
Deep Chatterjee | Optics | General | Comparison between Liu and Thorne Results and COMSOL results for TE noise |
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