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SubDyn documentation: Member Cosine Matrices #2374

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Aug 16, 2024
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SubDyn documentation: Member Cosine Matrices #2374

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9 changes: 6 additions & 3 deletions docs/source/user/subdyn/input_files.rst
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Expand Up @@ -555,9 +555,12 @@ Member Cosine Matrices COSM (i,j)
to be provided. Each row of the table will list the nine entries of the
direction cosine matrices (COSM11, COSM12,…COSM33) for matrix elements.
Each row is a vector in the global coordinate system for principal axes
in the x, y and z directions respectively. These vectors need to be
specified with an extremely high level of precision for results to be
equivalent to an internal calculation.
in the x (COSM11, COSM12, COSM13), y (COSM21, COSM22, COSM23) and
z (COSM31, COSM32, COSM33) directions respectively. Internally, SubDyn
transposes this provided matrix to make it consistent with the definition
of direction cosine matrix :math:`[ \mathbf{D_c} ]` used in SubDyn (Eq. :eq:`Dc`).
The vectors provided need to be specified with an extremely high level of
precision for results to be equivalent to an internal calculation.

Joint Additional Concentrated Masses
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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