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Why Eigenfrequency in Structure mechanics is imaginary?

Posted 18 déc. 2020, 00:02 UTC−5 Structural Mechanics Version 5.5 1 Reply

Hyunjung Cho
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I made Ni microcantilever (lwt=225micrometer28micrometer10nanometer). and the end of left side was contrained. Theoretically, Ni cantilever with 10nm thickness resonate near 150Hz.. but comsol results give imaginary term..

Mesh is extremely fine, So i think mesh doesn't matter I think i don't miss any constraint.. Please help me..

1 Reply Last Post 18 déc. 2020, 11:34 UTC−5
Dave Greve
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Posted: 4 years ago 18 déc. 2020, 11:34 UTC−5

Either the imaginary part is very small, in which case it is a numerical artifact; or it is physically significant and is due to dissipation or energy loss in the model.

Either the imaginary part is very small, in which case it is a numerical artifact; or it is physically significant and is due to dissipation or energy loss in the model.

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