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Position of a point in an eigenfrency study

Posted Feb 15, 2023, 4:05 p.m. EST 2 Replies

Étienne Pilon
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Hi everyone,

I try to follow the position of a point for each frequency of an eigenfrequency analysis. Is there a way to extract the (X, Y, Z) position or the displacement field for a point on my structure.

I was able to obtain the maximum Displacement of that point, but I am not able to extract what is happening between the max and the min.

Thank you all, Etienne

2 Replies Last Post Feb 18, 2023, 6:24 p.m. EST
Jeff Hiller COMSOL Employee

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Posted: 3 years ago Feb 17, 2023, 3:19 p.m. EST

Hello Etienne,

In an eigenfrequency analysis, the magnitude of the eigenmodes is meaningless. Oscillation of the eigenmodes is, of course, sinusoidal.

Best regards,

Jeff

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Jeff Hiller
Hello Etienne, In an eigenfrequency analysis, the magnitude of the eigenmodes is meaningless. Oscillation of the eigenmodes is, of course, sinusoidal. Best regards, Jeff
Dave Greve
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Posted: 3 years ago Feb 18, 2023, 6:24 p.m. EST

Viesing the magniduet of the displacement is not very helpful because one cannot distinguish between positive and negative values.

The most useful plot is a distorted shape plot, which provides a snapshot of the displacements at one time. A animation using dynamic data extension can also be useful for visualization.

Since the displacements are phasors, the displacement as a function of time is real(phasor*e^jwt).

Viesing the magniduet of the displacement is not very helpful because one cannot distinguish between positive and negative values. The most useful plot is a distorted shape plot, which provides a snapshot of the displacements at one time. A animation using dynamic data extension can also be useful for visualization. Since the displacements are phasors, the displacement as a function of time is real(phasor*e^jwt).

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