Home > List of Keywords > *FLEXPID
*FLEXPID
Data format:
A single line with 7 parameters, as follows:
NEL MMAX PMAX MMIN PMIN EPSC WC
Purpose:
To define a clipping and filtering on the torque of a flexjoint element.
Restriction:
A *FLEXJOINT must have been previously defined.
Details :
| Parameter | Description |
|---|---|
| NEL | Element number of a previously defined flexjoint element |
| MMAX | Maximum allowable torque |
| PMAX | Maximum allowable power (torque times relative angular velocity of flexjoint nodes) |
| MMIN | Minimum allowable torque |
| PMIN | Minimum allowable power (torque times relative angular velocity of flexjoint nodes) |
| EPSC | First parameter of the filter |
| WC | Second parameter of the filter |
Note
MMIN and PMIN are positive value but the clipping is performed when the torque is less than MMIN (respectively the power less than PMIN).
When clipping is used, an Ascii file is saved at each time step for each FLEXPID keyword. The files are named Dyn_flex_001.dat to Dyn_flex_aaa.dat where there are aaa FLEXPID keywords. It has three columns: time, torque, power.
Filter: \(\vec{M}_{filtered} = \frac{\vec{M}}{\Bigl [1 + 2j \zeta \frac{\omega}{\omega_e} - (\frac{\omega}{\omega_e})^2 \Bigr]}\)
