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Eigenfrequencies of a circular membrane
Posted 17 lug 2012, 06:40 GMT-4 Acoustics & Vibrations 0 Replies
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I was studying the model "Coupled Vibrations" in the model library, and I noticed something weird in the eigenfrequency analysis of the circular membrane (not yet couplet to the air cavity - Study 1).
I noticed that the ratio between the eigenfrequencies is very different from the one predicted by the theory. For example, the ratio between the first two eigenfrequencies should be 1.59***, but according to the results I get with comsol, this ratio is 2.08. Hence, also the other ratios are completely different. Of course, changing the parameters does not affect this relation.
Can anyone explain why is it so?
Am I missing something?
Any contribution is really appreciated!
*** see e.g. hyperphysics.phy-astr.gsu.edu/hbase/music/cirmem.html
Hello Elisa Benedetti
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