.. _V2.01.400:

**v2.01.400** SDLD400 — Star mass-spring system
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**Summary:**

This test consists in calculating the natural frequencies of a mass-spring star system. The reference solution is analytical.

The advantage of testing is to verify the methods available in modal analysis, in the presence of two discrete elements of translation and rotation:


* discrete elements DIS_TR on a node (modeling A);


* discrete elements DIS_TR on a segment (B modeling).

In this test, the structure is also rotated by 30° in order to validate the entry of data in a local coordinate system (keyword ORIENTATION in AFFE_CARA_ELEM).

A diagonal mass matrix is also used for these elements, which makes it possible to obtain a complete coverage of this functionality for the discrete elements.


.. toctree::
    :hidden:

    self

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

    Probl_me_de_r_f_rence
    Solution_de_r_f_rence
    Mod_lisation_A
    Mod_lisation_B
    Synth_se_des_r_sultats