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COMSOL : damped vibration analysis of a cantilevered beam

  1. Jun 6, 2009 #1
    Hi..
    I'm trying to do the damped vibration analysis of a cantilevered beam. Although i am choosing no damping in subdomain settings menu, it solves the problem as if the material is damped (the result is a damped vibration signal).
    Is this is a bug or am i missing something?
    Thanks in advance
     
  2. jcsd
  3. Jun 8, 2009 #2
    It must be taking the stiffness of the beam into consideration. I believe the damping option is for a specific type of damping ( modeling wise ) You can probably find out more on the damping option from the modeling guide.

    The initial conditions probably play a role as well. Is there an initial displacement, or a wave input?
     
  4. Jun 9, 2009 #3
    Hi Nick;
    There are two damping options : No damping and Rayleigh damping.. I choose "no damping". I know that Rayleigh damping is the combination of mass and stiffness but i dont choose it.

    There is no initial displacement or any wave input. Only a force input(which is almost a impulse function) on one of the free boundaries.

    There is another interesting point that if i choose "Weak Constraints : OFF", the results become very 'absurd'.
     
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