.. _v2.04.104:

**v2.04.104** SDLV104 - Fixed Developer Error DEFI_BASE_MODALE with the "ORTHO = OUI" option
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**Summary:**

We show the ability of the DEFI_BASE_MODALE command to concatenate and orthonormalize two vector families simultaneously (keyword RITZ and operand ORTHO).

The use of the operand 'ORTHO = OUI' will be validated on a dynamic transient calculation on a modal basis enriched with static modes. A calculation on a sound basis, without recourse to the option 'ORTHO = OUI', will be used as a reference solution.

We consider the study of a slender beam with several blockages subjected to an instantaneous force with a triangular temporal profile.



.. toctree::
    :hidden:

    self

.. toctree::
    :maxdepth: 2
    :numbered:

    Probl_me_de_r_f_rence
    Solution_de_re_ference
    Synth_se_des_r_sultats