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*NODECONT,NAME=COMP
Data format:
One line with 2 parameters followed by one line 2 parameters
INOD ITYP
INOREF COEF TST TRAMP
Status :
Optional
Restriction :
For dynamic analysis only. The nodes (INOD and INOREF) must have been previously defined
Purpose :
To define a simplified heave compensator
Details :
| Parameter | Description |
|---|---|
| INOD | Controlled node, the heave compensator modifies the motion of that node |
| ITYP | type of control = 1 :displacement |
| INOREF | Reference Node |
| COEF | Compensation factor |
| TST | Starting time (s) |
| TRAMP | Ramp time (s) |
Notes : INO should be a slave node in translation of INOREF. The dynamic displacement (D_INOREF) of INOREF is computed in the global vertical direction with respect to its position at the end of the static analysis. The velocity (V_INOREF) and acceleration (A_INOREF) of INOREF in the vertical global directions are also obtained. To the global vertical motion (resp velocity and acceleration) of node INO is added COEF x D_INOREF (resp. COEF x V_INOREF and COEF x A_INOREF). If INO is linked in translation to INOREF then instead of having the same vertical displacement as INOREF it has a displacement reduced by a ratio (1-COEF*MULT). MULT is equal to 0 when time is less than TST, 1 if time is greater than TST+TRAMP and varies linearly from 0 to 1 when time varies from TST to TST+TRAMP.
