40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log  Not logged in ELOG logo
Message ID: 8226     Entry time: Mon Mar 4 20:03:42 2013
Author: Annalisa 
Type: HowTo 
Category: COMSOL Tips 
Subject: Study of mirror mount eigenfrequencies 

 I studied the eigenfrequencies of a mirror mount designed with COMSOL.

I imposed fixed constraints for the base screws and for the screw connecting the base with the pedestal. Note that the central screw is connected to the base only for a small thickness, and the pedestal touches the base only with a thin annulus. This is in way to make a better model of the actual stress.

Shown in fig. 2 is the lowest eigenfrequency of the mount.

I' going to change the base and study the way the eigenfrequency vary, in way to find the configuration which minimizes the lowest eigenfrequency.

 

Attachment 1: MirrorSupport1.png  40 kB  | Hide | Hide all | Show all
MirrorSupport1.png
Attachment 2: MirrorSupportEig1.png  143 kB  | Show | Hide all | Show all
Attachment 3: pedestal.png  12 kB  | Show | Hide all | Show all
Attachment 4: Base2.png  20 kB  | Show | Hide all | Show all
ELOG V3.1.3-