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Calculating Rayleigh Damping Parameters
Posted Nov 4, 2010, 12:41 p.m. EDT Structural Mechanics Version 5.2a 1 Reply
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How can one calculate damping parameters (alpha & beta) for a given structure in Comsol?
there is some information about damping in 'smeug.pdf' (pages 140-148, 199, 372). However, it seems that the procedure of the constant calculation is not clear. They address a reader to the Elbow Bracket example (smeug.pdf' pp 36-37). In this example, they assume that "the structure has a constant damping ratio of 0.1."...Actually, if we assume another number we will get different damping parameters.
Please advise,
Stephan
Hello SR
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Did u solve the problem? I also has some confusion about the damping part in comsol.
As I know the alpha & beta can be calculated by the first & second order eigenfrequency, and the corresponding mode damping ratio(may be this name). And the alpha is the mass damping,beta is the stiffness damping. But what to do nest I totally have no idea.
Maybe I NEED to give the structure a transient pulse to see the displacement vs time curve to calculate the damping ratio of the structure? In the experiment this is one of the way to measure damping ratio.
This is not a mature idea but I WILL try. If u still focus on or have solved this problem please give me some advice. Many 3x.
Ragards,
Yupeng