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ID Datedown Author Type Category Subject Text Attachments
  140   Tue Aug 11 16:35:07 2020 aaronGeneralConfigurationCOMSOL: remote server w/ matlabTo run COMSOL on sandbox1 with no
graphical Interface, here are the
steps that worked for me (Tue Aug 11 16:35:51
  139   Tue Aug 11 11:16:29 2020 aaronGeneralConfigurationCOMSOL with Matlab without displayWhen running comsol with matlab interface
on sandbox1, it is usually most convenient
to ssh with screen forwarding (eg '-CY')
  138   Tue May 12 14:16:28 2020 KojiGeneralGeneralFEA tutorial resourcescf. Forwarded email from Stephen

1) Tuesday Demo - Basics of FEA
Meshing G2000696
  137   Thu Mar 7 10:10:37 2019 Ching PinMechanics comsol modellingThere are no issues with the thermal side
of the modeling, the issue seems to be with
the structural mechanics side. I'm not
  136   Wed Mar 6 09:51:18 2019 Ching PinMechanics comsol modellingSo I tried adding the sapphire lens to
the comsol model, and I am having teething
issues. I can't seem to get the solver
  135   Mon Mar 4 17:22:07 2019 Ching PinMechanics comsol modellingI've updated the material properties
to vary with temperature, mainly in the range
of 90-140 K. Using the parametric sweep function
  134   Fri Mar 1 19:33:40 2019 Ching PinMechanics comsol modellingI've changed the heating to be from
two heat sources, to better model the situation
with a heater and a laser. The heater deposits
  133   Tue Feb 19 19:52:53 2019 Ching PinMechanics comsol modellingThe time step response to heating via laser
(22.5 mW) is given in the attached picture,
for 2 starting temperatures, 122.5 K and
  132   Fri Feb 15 21:05:31 2019 Ching PinMechanics comsol modelling 

So I got the time dependence to
work, but I'm not sure what went wrong
  131   Thu Feb 14 12:38:51 2019 Ching PinMechanics comsol modellingSo I did a simple comsol model of laser
heating of a silicon disk, with only radiation,
to see the temperature variation at steady
  130   Sun Aug 26 19:21:27 2018 ranaGeneralVoyagerVoyager ITM: Radiative cooling with cold shield and cold CPthis is a time dependent model of the previous
steady-state one

Cold Shield and CP held
  129   Sun Aug 26 16:42:54 2018 ranaMechanicsAnalysisTest Mass Thermal Noise: Consistency ChecksFor the Voyager test masses, we have been
considering a barrel coating to increase
the IR emissivity to increase the radiative
  128   Mon Aug 20 15:44:56 2018 ranaGeneralGeneralfile size >> smallAlso,

click 'Clear Mesh'
under the mesh menu
  127   Sat Mar 17 15:27:48 2018 ranaGeneralGeneralfile size >> smallWhen saving your COMSOL files do these
two things to make the files much smaller
(good for saving in version control and sharing):
  126   Mon Jan 29 23:02:13 2018 aaronMechanicsPonderSqueezetips from ShoaibI started implemented some of these changes:

Started the mesh with a
boundary free quad mesh on the interface
  125   Mon Jan 22 21:13:25 2018 aaronMechanicsPonderSqueezetips from ShoaibI talked with Shoaib about some changes
I could make to the FEA model to improve
convergence and reduce memory usage. Summary:
  124   Thu Jan 18 21:13:59 2018 aaronOpticsPonderSqueezemodifications to Gautam's 40m finesse modelI made a copy of Gautam's 40m model
to add the unstable filter cavity for
the ponderomotive squeezing project. I wanted
  123   Tue Dec 12 11:50:12 2017 aaronMechanicsPonderSqueezeFEA on optimusSimulation results


Gautam ran the
COMSOL model on sandbox1 since we were trying
  122   Tue Dec 5 19:50:47 2017 aaronMechanicsPonderSqueezeFEA on optimusGautam advised me against trying to install
version 5.3, lest it break version 5.1--I
had already gone through the install, but
  121   Tue Dec 5 10:50:54 2017 aaronMechanicsPonderSqueezeFEA on optimusI had some trouble running this on optimus.

Optimus has COMSOL 5.1 installed,
but I made these files in 5.3. I downloaded
  120   Mon Dec 4 19:49:32 2017 gautamMechanicsPonderSqueezeFEA on optimusIt's a good idea, I'll check out
her elogs and get it started tonight.

I found that I had the relative
  119   Mon Dec 4 17:42:53 2017 gautamMechanicsPonderSqueezeFEA on optimusWe could run the simulations on the 32
core machine in the 40m lab (optimus)? I
think Mariia was running some of her studies
  118   Mon Dec 4 16:27:13 2017 aaronMechanicsPonderSqueeze Meshing Surface Layers

New Selections

I don't know
why I wasn't seeing this problem with
  117   Wed Nov 15 14:05:12 2017 AaronMechanicsPonderSqueezeModelling suspension noiseModel Geometry

pared down the number of parameters in the
model to only the necessary ones. These are
  116   Fri Nov 3 15:03:10 2017 AaronMechanicsPonderSqueezeModelling suspension noiseModel Geometry


I found the dimension
of the test mass flat in the drawings of
  115   Thu Nov 2 17:23:56 2017 AaronMechanicsPonderSqueezeModelling suspension noiseaLIGO Suspensions Toy Model

Wednesday I started making my own model
of the aLIGO suspensions, with the top of
  114   Mon Jul 31 22:18:57 2017 ranaGeneralGeneralusing more than 12 cores in matlabSince
2014, the limit of 12 workers using the matlab
parallel computing toolbox has been lifted.
  113   Fri Jul 28 15:48:58 2017 MariiaGeneralConfigurationComsol batch for windowsUsing the written path from elog by
ericq: Computer
Scripts/Programs, Comsol can be run from
  112   Wed Jul 26 20:14:46 2017 ranaGeneralConfigurationRunning Comsol to Matlab I've just tried this out on my desktop
machine using COMSOL 5.1 and its still working.
Which COMSOL is installed on optimus at the
  111   Mon Jul 24 15:54:26 2017 KojiGeneralConfigurationRunning Comsol to Matlab The number of licenses already used by
whom / still remains can be confirmed by
running the following command on a comsol-installed
  110   Mon Jul 24 15:35:34 2017 MariiaGeneralConfigurationRunning Comsol to Matlab WIth Gautam's help, I have created
a user directory in 40 meter Lab and
copied Rana's documents (MATLAB
  109   Sun May 7 18:22:35 2017 ranaGeneralVoyagerVoyager ITM: Radiative cooling with cold shield and cold CPI took
Aidan's COMSOL model for the ITM from
  108   Fri Jul 29 14:33:41 2016 Joy WestlandMechanicsGeneralA Tutorial in Importing SolidWorks Files and Applying a Gaussian Force in ANSYS for a LIGO Test MassHere is a tutorial in importing SolidWorks
into ANSYS and the steps needed to apply
a Gaussian Force to the LIGO test mass that’s
  107   Wed Jun 29 14:14:44 2016 Joy WestlandMechanicsAnalysisANSYS Tutorials with Basic MeshingHere are a series of tutorials for basic
meshing principles from ANSYS Meshing Basics:

ANSYS Meshing Fine Mesh
  106   Tue Jun 28 16:54:23 2016 Nikhil MathurMechanicsAnalysisAnsys 14.5 Indroductory Tutorial: Modal Frequency ConvergenceThis tutorial will go through how to show
frequency convergence for a cylindrical cantilever
using Ansys 14.5 and Mathematica.
  105   Tue Jun 28 15:50:45 2016 Joy WestlandMechanicsAnalysisA Simple Model of the Modal Analysis of a Cantilever Circular/Cylinder Cross Section in ANSYS tutorialHere is a tutorial to implement a simple
Modal Analysis of a Cantilever Cylinder

1. Open the ANSYS workbench
  102   Fri Dec 4 18:32:02 2015 ranaGeneralConfigurationCOMSOL: remote server w/ matlabThis summarizes how to get the remote comsol
server to run. COMSOL is now on
tegmeni thanks to Larry.
  101   Sat Sep 5 15:17:41 2015 ranaGeneralConfigurationFEA logs mergedI moved the only entry from the 'ENG_FEA'
log into the COMSOL log and then renamed
that logbook as 'FEA' since we don't
  100   Sat Sep 5 15:04:43 2015 Dennis CoyneMechanicsConfigurationsummary of FEA modal model to State Space model At the 2014 commissioning  FEM2SS_summary.docx 
  99   Tue Sep 30 11:30:27 2014 Nic, Dmass, EvanGeneralConfigurationGravity in ComsolHere
is a set of slides by Yoichi Aso on how to
handle gravity in Comsol.
  98   Sat Aug 2 00:22:34 2014 Sam MooreOpticsGeneralFinding the Right Meshing for the TIR cavity


  97   Thu Jul 31 20:55:38 2014 Sam MooreOpticsGeneralFinding the Right Meshing for the TIR cavity In this document, I try to identify
I good mesh by comparing the numerical solution
from that mesh with my analytical model.
  96   Mon Jul 14 19:14:31 2014 Sam MooreOpticsGeneralDuan and Heinert Comparison


  95   Mon Jul 14 19:09:14 2014 Sam MooreOpticsGeneralUsing Heinert's Solution for Duan's Parameters I have plotted Heinert's analytical
solution for TR noise using Duan's parameters.
 Since TO and TE noise can be found
  94   Fri Jul 11 10:58:18 2014 not KojiOptics Heinert Model TR Noise Verification


  93   Thu Jul 10 16:51:14 2014 Sam MooreOpticsGeneralDuan and Heinert Comparison(See Plots in attached document)
My plan has been to replicate Duan's
  92   Mon Jul 7 19:47:00 2014 KojiOptics Heinert Model TR Noise VerificationHow close are these FEA calculations with
the analytical values? 
Can you plot residual too? (Put analytical
  91   Sat Jul 5 13:04:32 2014 Sam MooreOptics Heinert Model TR Noise VerificationAgreement with Heinert's paper for cylindrical
TR noise has now been achieved.  Using
the stationary state assumption to calculate
  90   Sun Jun 29 20:25:44 2014 KojiOpticsGeneralDifficulty with the COMSOL stationary module; Test CasesWhat about this example? The result is
easier to understand intuitively.
Consider a bar with the length of
  89   Sun Jun 29 15:37:18 2014 Sam MooreOpticsGeneralDifficulty with the COMSOL stationary module; Test Cases


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