SubDyn: add nodal rotations to mode-shape JSON output for viz3Danim#3374
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RBergua wants to merge 4 commits into
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SubDyn: add nodal rotations to mode-shape JSON output for viz3Danim#3374RBergua wants to merge 4 commits into
RBergua wants to merge 4 commits into
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Feature or improvement description
Till now, SubDyn was writing down the nodal displacements for the mode shapes into the output JSON file if
OutCBModes = 1orOutFEMModes = 1.The code has now been modified to write down nodal rotations as well. This will allow in the future to rotate the beam cross-sections to visualize torsional modes in viz3Danim (https://github.com/ebranlard/viz3Danim).
For reference, the rotations use the same scaling factor as the translations.
Previous JSON file:
Updated JSON file:
This new format is compatible with the parser used in viz3Danim.
Related issue, if one exists
ebranlard/viz3Danim#7
Impacted areas of the software
SubDyn
Test results, if applicable
A verification was performed to ensure the proper behavior.
The mode shapes including displacements and rotations are shown for the first two bending modes of the cantilever beam described here: #2646 (comment)
The results from SubDyn are compared against an in-house FEM model labeled as “reference”.
In the below plots, all modal coordinates are normalized by the maximum translational displacement.
First vertical bending mode:
As expected, the mode shape corresponds to displacements in the vertical (z) direction and rotations around the y axis (pitch).
First horizontal bending mode:
As expected, the mode shape corresponds to displacements in the horizontal (y) direction, the corresponding rotations around the z axis (yaw) and rotations around the x axis (roll). The rotations around the x axis denote torsion around the beam longitudinal axis due to the mass eccentricity corresponding to the outer column (see system description for reference).