Example of use
=====================

Here is an example presenting the different possibilities of the EXTR_MODE command for a modal analysis carried out by 5 successive mode searches:

# Calculation of the total mass of the structure (for verification)


.. code-block:: text

    massestr = POST_ELEM (... MASS_INER = ( ... ));

# Calculating the first 17 frequencies (NUME_ORDRE from 1 to 17; NUME_MODE from 1 to 17)


.. code-block:: text

    mode1 = CALC_MODES (MATR_RIGI = stiffness,
MATR_MASS = mass,
OPTION = 'PLUS_PETITE',
CALC_FREQ = _F (NMAX_FREQ = 17);


.. code-block:: text

    mode1 = NORM_MODE (MODE = mode1, reuse = mode1,
NORME = 'TRAN_ROTA'
);

# Calculating other frequencies (NUME_ORDRE from 1 to 5; NUME_MODE from 18 to 22)


.. code-block:: text

    mode2 = CALC_MODES (MATR_RIGI = stiffness,
MATR_MASS = mass,
OPTION = 'BANDE',

    CALC_FREQ =_F (FREQ = (20., 25.)),

    );


    mode2 = NORM_MODE (MODE = mode2, reuse = mode2,
NORME = 'TRAN_ROTA'
);


    # Calculating other frequencies (NUME_ORDRE from 1 to 6; NUME_MODE from 23 to 28)


    mode3 = CALC_MODES (MATR_RIGI = stiffness,
MATR_MASS = mass,
OPTION = 'BANDE',
CALC_FREQ =_F (FREQ = (25.30.)),

    );


    mode3 = NORM_MODE (MODE = mode3,
reuse = mode 3,
NORME =' TRAN_ROTA ',
);


    # Calculating other frequencies (NUME_ORDRE from 1 to 3; NUME_MODE from 28 to 30)


    mode4 = CALC_MODES (MATR_RIGI = stiffness,
MATR_MASS = mass,
OPTION = 'BANDE',
CALC_FREQ =_F (FREQ = (29., 32.)),

    );


.. code-block:: text

    mode4 = NORM_MODE (MODE = mode4,
reuse = mode4,
NORME =' TRAN_ROTA ',
);

# Calculating other frequencies (NUME_ORDRE from 1 to 6; NUME_MODE from 31 to 34)


.. code-block:: text

    mode5 = CALC_MODES (MATR_RIGI = stiffness,
MATR_MASS = mass,
OPTION = 'BANDE',
CALC_FREQ =_F (FREQ = (32., 35.)),

    );


.. code-block:: text

    mode5 = NORM_MODE (MODE = mode5,
reuse = mode5,
NORME = 'TRAN_ROTA'
);

# Extracting modes


.. code-block:: text

    mode = EXTR_MODE (FILTRE_MODE = _F (MODE = mode, 1)
TOUT_ORDRE = 'OUI'),
(MODE = fashion 2,
NUME_MODE = (18,19,20,21,22)
(MODE = fashion 3,
FREQ_MIN = 25. ,
FREQ_MAX = 30.),
(MODE = mode4,
NUME_MODE_EXCLU = 28),
(MODE = fashion 5,
CRITERE = 'MASS_EFFE_UN',
SEUIL = 0.005),
IMPRESSION =_F (CUMUL = 'OUI')
);