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Phase Angle of mechanical displacement

Posted 2024年6月3日 GMT-4 11:41 Results & Visualization, Structural Mechanics, Modeling Workflow Version 6.2 3 Replies

Lukas Gögele
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I am modelling some mechanical part and performing a harmonic analysis. As boundary condition displacement is applied. The problem is, that I do not get any phase angle from the displacement. Also when using solid.uPhaseX the angle is always zero.

3 Replies Last Post 2024年6月4日 GMT-4 03:06
Dave Greve
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Posted: 10 months ago 2024年6月3日 GMT-4 11:54

If your displacement boundary condition is +1[m] (for example) this is a phase angle of zero. If you wish a phase angle of 90 degrees you would write +j*1[m], etc.

If your displacement boundary condition is +1[m] (for example) this is a phase angle of zero. If you wish a phase angle of 90 degrees you would write +j*1[m], etc.
Henrik Sönnerlind COMSOL Employee

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Posted: 10 months ago 2024年6月4日 GMT-4 02:36

To expand on Dave's answer: If there is any type of damping in the model, then the displacement will in general have nonzero phase angles, even when all loading has zero phase. Exactly at the driven boundary, the phase angle will match that of the prescribed displacement.

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Henrik Sönnerlind
COMSOL
To expand on Dave's answer: If there is any type of damping in the model, then the displacement will in general have nonzero phase angles, even when all loading has zero phase. Exactly at the driven boundary, the phase angle will match that of the prescribed displacement.
Lukas Gögele
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Posted: 10 months ago 2024年6月4日 GMT-4 03:06
Updated: 10 months ago 2024年6月4日 GMT-4 03:28

Thanks for the answer. The loading with zero phase is fine, the strange thing is, that the phase angle is 0 everywhere in the model

----solved now. I had no damping included!

Thank you!

Thanks for the answer. The loading with zero phase is fine, the strange thing is, that the phase angle is 0 everywhere in the model ----solved now. I had no damping included! Thank you!

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