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Inertia element - add output of beta and gamma

Reinhard Resch requested to merge inertia-beta-gamma into develop

The following features have been added/changed:

  • In case of "output, always", all the output is written to a separate output file (*.inl) like all other elements too.
  • Principal axes are computed in an incremental fashion. So, they will be consistent with structural nodes orientation, unless the compound body has two or three identical principal moments of inertia.
  • Output of momentum and momenta moment have been added.
  • Private data for momentum and momenta moment have been added.
  • Mat3x3::EigSym uses LAPACK's dsyev routine. So, principal moments of inertia will be sorted in ascending order. Otherwise principal moments of inertia and principal axes will have a random order.
Edited by Reinhard Resch

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