COMSOL Forums: Vibration of a cantilever beam
http://www.comsol.com/community/forums/general/thread/34178/
Most recent forum messagesFri, 18 Jan 2013 05:52:12 +0000COMSOL Forums: Vibration of a cantilever beamhttp://www.comsol.com/shared/images/logos/comsol_logo.gif
http://www.comsol.com/community/forums/general/thread/34178/
Re: Vibration of a cantilever beam
http://www.comsol.com/community/forums/general/thread/34178/#p93961
Hi<br />
<br />
I would propose harmonic development (frequency sweep swith a constant force amplitude (or a frequency dependet if you want to scan a PSD (power spectral density) distribution)<br />
<br />
--<br />
Good luck<br />
IvarFri, 18 Jan 2013 05:52:12 +000034178.1358488332.93961Re: Vibration of a cantilever beam
http://www.comsol.com/community/forums/general/thread/34178/#p93935
Hi, <br />
Thanks for your response.<br />
I have indeed applied body load (i.e. g*acceleration). But my question is to get appropiate solution, what kind of study should I do? Should I apply the body load in the form of a sinusoid and do time dependent analysis with t defined for more than one time period (1/first eigen freq)? Is that correct or any other kind of simulation setup is needed?<br />
<br />
Thanks in advance.Thu, 17 Jan 2013 20:22:06 +000034178.1358454126.93935Re: Vibration of a cantilever beam
http://www.comsol.com/community/forums/general/thread/34178/#p93925
Hi<br />
<br />
the vibration load aspect is not trivial, you can either define a gravity = body force rho*a (a=acceleration) applying onto your model, with one boundary fixed, or add a "large Mass" object that can slide onto which you apply a force of given F=M*a with a the acceleration.<br />
<br />
But the transfer functions are not exactly the same. Check the Forum, it has been discussed a few times<br />
--<br />
Good luck<br />
IvarThu, 17 Jan 2013 19:43:33 +000034178.1358451813.93925Vibration of a cantilever beam
http://www.comsol.com/community/forums/general/thread/34178/#p93882
Hi,<br />
I am trying to model a beam oscillating under external vibration condition.<br />
I have kept one end of the beam fixed. I have tried applying different kind of boundary conditions to solve the problem. <br />
1. applied accelaration (10m/s2) on the fixed end and did the freq domain analysis.<br />
2. applied accelaration (10m/s2) on the entire structure and did the freq domain analysis.<br />
<br />
but i did not get the expected displacement of the beam.<br />
<br />
can anyone suggest what would be the appropiate boundary conditions and analysis method for such case?<br />
Thu, 17 Jan 2013 10:57:13 +000034178.1358420233.93882