3. Operands

3.1. Keyword FILTRE_MODE

This keyword is repeated as many times as there are mode_meca_* or mode_gene data structures to filter and concatenate.

3.2. Operand MODE

Name of the mode_meca_* or mode_gene data structure to sort and concatenate with others.

3.3. Mode filtering

To filter the modes, the user has three options.

3.3.1. Operands NUME_MODE/NUME_ORDRE/TOUT_ORDRE

List the order numbers or modal positions of the modes you want to keep.

3.3.2. Operands NUME_MODE_EXCLU

List of the modal positions of the modes you want to remove.

3.3.3. Operands FREQ_MIN/FREQ_MAX/PRECISION

All the modes corresponding to frequencies between f_min and f_max are kept at the relative precision prec. We must have f_min less than f_max.

3.3.4. Operand CRIT_EXTR

Choice of the parameter that is used as a criterion for filtering the modes. The parameters are defined in the reference documentation [R5.01.03].

If the criterion is” MASS_EFFE_UN “or MASS_EFFE” a mode will be retained as soon as one of its effective modal masses, which may or may not be, directional exceeds a threshold set by the user.

If the criterion is” MASS_GENE “a mode will be retained as soon as the ratio of the generalized mass to the sum of the generalized masses of the modes of the filtered structure is greater than a threshold set by the user.

These criteria only make sense for mode_meca_* data structures.

3.3.5. Operands SEUIL, SEUIL_X, SEUIL_Y, SEUIL_Z

Limit value of the criterion below which it is considered that the mode can be filtered.

This value, in the case of the parameters currently taken into account, is an dimensionless relative value.

You can apply the same threshold in all directions (keyword SEUIL) or differentiate the thresholds according to the \(X\), \(Y\) or \(Z\) directions (SEUIL_X, SEUIL_Y, SEUIL_Z)

3.4. Keyword IMPRESSION

This keyword allows you to print a table of accumulation of certain parameters. These parameters may be different from those chosen in the FILTRE_MODE keywords.

3.4.1. Operand CUMUL

Print or not print the aggregations of the modal parameter selected by CRIT_EXTR for the resu_mod result data structure.

3.4.2. Operand CRIT_EXTR

Choice of the print parameter for which the accumulation operation is performed. If the criterion is” MASS_EFFE_UN “(unit effective mass), the values of the parameters” MASS_EFFE_UN_DX “,” MASS_EFFE_UN_DY “,” MASSE_EFFE_UN_DZ “(effective unit modal mass in the direction D*) of the extracted modes are accumulated separately.

If the criterion is” MASS_GENE “we combine the values of the parameter MASS_GENE (generalized mass) of the extracted modes.

The parameters mentioned in this paragraph are further defined in the reference material [R5.01.03].

3.5. Keyword TITRE

Title attached to the concept produced by this operator [U4.03.01].