40m QIL Cryo_Lab CTN SUS_Lab CAML OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  COMSOL elog, Page 3 of 3  Not logged in ELOG logo
ID Date Author Type Categorydown Subject Text Attachments
  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):
  128   Mon Aug 20 15:44:56 2018 ranaGeneralGeneralfile size >> smallAlso,

click 'Clear Mesh'
under the mesh menu
  138   Tue May 12 14:16:28 2020 KojiGeneralGeneralFEA tutorial resourcescf. Forwarded email from Stephen

1) Tuesday Demo - Basics of FEA
Meshing G2000696
  142   Thu Jul 6 11:35:55 2023 RajashikGeneralGeneralBasic Demonstration of Cavity ScanAttached are plots of how HOMs are introduced
by defects in the mirror. This is just an
example for a basic FP Cavity.
  144   Sat Jul 29 00:19:02 2023 RajashikOpticsGeneral I have coded a rudimentary triangular model
using parameters provided by Aaron. In this
model, I have kept a simple PDH signal which
  4   Thu May 2 14:00:36 2013 KojiGeneralConfigurationtest mass TR with Levin's approachThermo-refractive noise in a finite
cylindrical/infinite test mass with Levin's
  76   Mon Sep 16 10:07:32 2013 EvanGeneralConfigurationCOMSOL 4.3 on the OS X command lineIf you're running Matlab scripts that iterate
over simulation parameters (à la Tara),
  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.
  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 
  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
  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.
  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
  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
  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
  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
  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')
  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
  82   Thu Apr 17 16:52:09 2014 EvanGeneralCharacterizationInterpreting logfiles and picking a solverHere are two entries by Walter Frei on
the Comsol blog that I've found useful.
  77   Wed Nov 13 23:55:44 2013 Chris CousteOpticsAnalysisOptical Mount Vibrational AnalysisProject: Vibrational Analysis of Optical
Goal: Use COMSOL to run finite element
  78   Mon Nov 18 15:56:59 2013 Chris CousteOpticsAnalysisRepresentative ModelsThe simpler models of the optical mounts
are finished, they will be run through the
comsol analysis software soon.
  79   Fri Nov 22 21:04:53 2013 Chris CousteOpticsAnalysisanalysis The analysis is making nice eigenmode
and stress mode models, but the displacement
experiment needs work. Should be fixed by
  80   Fri Jan 24 17:26:38 2014 Chris CoustéOpticsAnalysisMount Analysis Functional! The comsol eigenmode analysis is
complete, and the only thing left to do on
this part of the project is to run the analysis
  81   Sun Feb 16 21:10:56 2014 Chris CoustéOpticsAnalysisOptical Mount data compilation 1: Aluminum The time is finally here! this is
the highest displacement of each mount in
its lowest few eigenfrequencies, using 6061
  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
  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.
  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
  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
  143   Fri Jul 21 16:42:57 2023 RajashikOpticsAnalysis Initially, ideal conditions were considered,
without any deformations or thermal heating
effects in the mirrors. This offered a baseline
  3   Tue Apr 2 19:24:07 2013 Emory BrownOptics First steps producing a Finite Element Model to find the internal Brownian noise of a LIGO test mass 
  83   Sun Jun 22 23:44:56 2014 Sam MooreOptics Going through Heinert's 'TR noise of cylindrical test masses' paperAt this point, my are goals are to 1) convert
the time-dependent heat equation into stationary,
complex form, 2) use the Levin approach to
  84   Mon Jun 23 11:40:17 2014 Sam MooreOptics Going through Heinert's 'TR noise of cylindrical test masses' paper


  85   Mon Jun 23 16:10:17 2014 Matt A.Optics Going through Heinert's 'TR noise of cylindrical test masses' paper


  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
  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
  94   Fri Jul 11 10:58:18 2014 not KojiOptics Heinert Model TR Noise Verification


  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
  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
  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
  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
  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
  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
  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
ELOG V3.1.3-