3. Operands#
3.1. Keyword SPECTRE#
This keyword is mandatory to fill in the various spectra to be treated.
3.1.1. Operand TABLE#
This operand makes it possible to provide spectra in the form of a table from the macrocommand MACR_SPECTRE. In this case, the macro-command builds layers from the table provided (with parameters FREQ and AMOR). A sheet is constructed for a given floor name and direction. In addition to the floor name, the building name and a comment are retrieved if present (see [U4.32.11]).
3.1.2. Operand NAPPE#
This operand allows the user to provide spectra directly in the form of layers whose parameters are frequency and damping. Additional information must then be provided in order to be able to proceed with the step of grouping the tables by direction and by floor. These are operands DIRECTION and NOM. The operands BATIMENT and COMMENTAIRE can also be filled in to fill the graphics output cartridges.
3.1.3. Operand DIRECTION#
This keyword, mandatory if the spectra are defined by the keyword NAPPE, allows you to specify the direction of the spectra. It takes one of the following 4 values: “X”, “Y”, “Z”, “H”.
3.1.4. Operand NOM#
This keyword allows you to define the name of the floor from which the spectrum defined by the keyword NAPPE comes from.
It is mandatory if NAPPE is present.
3.1.5. Operand BATIMENT#
This keyword makes it possible to define the name of the building in which the floor from which the spectrum defined by the keyword NAPPE is located is located.
This keyword is optional. If it is filled in, it is used in particular for the nomenclature of the « tables » and « figures » files created.
3.1.6. Operand COMMENTAIRE#
This keyword allows you to give a comment related to the spectrum defined by the NAPPE keyword.
This keyword is optional. If it is filled in, it will appear in the subtitles of the figures created.
3.1.7. Operand ELARG#
This keyword allows you to define the broadening that will be applied to the spectrum during the smoothing step (call to CALC_FONCTION/LISS_ENVELOPPE).
The impact of this enlargement value is explained in [U4.32.04] (See ELARG in LISS_ENVELOPPE).
Note: this keyword only has an impact on OPTION =” VERIFICATION “.
3.2. Keyword OPTION#
This mandatory keyword allows you to define the smoothing option for CALC_FONCTION/LISS_ENVELOPPE.
/”CONCEPTION”
The first step consists in creating an envelope on the spectra provided. In a second step, the spectrum obtained is smoothed according to the number of smoothed points requested NB_FREQ_LISS.
/'VERIFICATION'
The first step consists in smoothing each spectrum provided. Then, each spectrum is broadened according to the coefficients provided in ELARG. In a third step, the envelope of the expanded spectra is calculated. Finally, the spectrum obtained is smoothed as a function of the number of smoothed points requested.
3.3. Keyword NB_FREQ_LISS#
Number of frequencies desired for the smoothed spectra. In the case of the “CONCEPTION” option, only one value is provided. For the “VERIFICATION” option, you can provide two values in the form of a pair that will be applied to the first and second smoothing respectively.
3.4. Keywords FREQ_MIN and FREQ_MAX#
Frequency definition range of the smoothed spectrum. The frequencies mentioned under FREQ_MIN and FREQ_MAX must be selected from the discretization frequencies of the raw spectrum. By default, the full spectrum is considered.
3.5. Keyword ZPA#
Value of the acceleration at high frequency that one wishes to impose for the smoothed spectra. This keyword is optional. By default, the value of ZPA of the spectrum with the least amount of damping is retained.
3.6. Keywords BORNE_X, BORNE_Y, ECHELLE_X, ECHELLE_Y,, LEGENDE_X, LEGENDE_Y#
These keywords are used when the figures are printed. They are forwarded to IMPR_FONCTION. Details are given in [U4.33.01].