3. Operands

3.1. Keyword MODE_NON_LINE

♦ MODE_NON_LINE

Table_container concept derived from a calculation with the MODE_NON_LINE operator.

3.2. Keyword SCHEMA_TEMPS

◊ SCHEMA_TEMPS

Under this keyword factor, you can fill in an integration diagram with, possibly, its parameters. The available schemas are to be declared under the SCHEMA operand.

3.2.1. Operand SCHEMA

◊ SCHEMA = 'NEWMARK'

Choice of the temporal integration algorithm. For the time being, only the Newmark scheme is possible. It is an implicit time integration scheme allowing the resolution of linear ordinary differential equations. This is the schema by default.

3.2.2. Operand NB_INST

◊ NB_INST

The resolution is carried out over a period of a given periodic solution. The nbinst value is used to define the discretization for the resolution. The higher the number of ddls, the bigger nbinst should be. By default nbinst = 1000.

3.3. Keyword TOLERANCE

◊ TOLERANCE

tol is the control value on the error of the Floquet coefficients \({\gamma }_{i}\), which makes it possible to rule on the stability of the periodic solution. If \(\forall i\), \(\mid {\gamma }_{i}\mid >(1+\mathit{tol})\) then the periodic solution is unstable otherwise it is stable.

3.4. Keyword FILTRE

◊ FILTRE

Filter the periodic solutions on which the stability calculation will be performed. By default, the stability calculation is performed on all periodic solutions of resu_in.

3.4.1. Operand NUME_ORDRE

◊ NUME_ORDRE

This keyword allows you to calculate the stability on a list of order numbers. The keyword is not valid if the FREQ_MIN keyword is present.

3.4.2. Operand FREQ_MIN

◊ FREQ_MIN

This keyword is used to define the lower bound of the frequency range [freq_min, freq_max]. Stability is calculated if the frequency of the periodic solution is within this frequency range. The keyword is not valid if the NUME_ORDRE keyword is present.

3.4.3. Operand FREQ_MAX

◊ FREQ_MAX

This keyword is used to define the upper bound of the frequency range [freq_min, freq_max]. Stability is calculated if the frequency of the periodic solution is within this frequency range.

3.4.4. Operand PRECISION

◊ PRECISION

This keyword (optional) allows you to specify the limits of the frequency range [freq_min, freq_max].

3.5. Keyword INFO

Integer used to specify the printing level in the file MESSAGE.

If INFO =1, we display whether the solution is stable or unstable for the serial solution serial number.

If INFO =2, the absolute and relative error of the resolution is also displayed by the temporal integration diagram, as well as the largest Floquet coefficient.