*RETENSION,FILE=Filename

Data format:

Three lines with the following parameters:

IGR INODE Kp Td Ti Lmin Lmax Vmax Vmin
DLLFileName
DLLProcName

Status :

Optional

Purpose :

To adjust the length of a mooring line in order to achieve a specified target tension

Restrictions :

A mooring line must have been created. Dynamic analysis only.

Details :

Parameter	Description
filename.dat	File where the tensioning scenario is specified. Two columns: Time and tension. Specify negative tension (for example -1), to indicate time steps where the retensioner is OFF. Specify only tension a t+0 if constant tension is wanted. Deeplines interpolates the target tension at each time step, and returns it to the procedure with the other parameters.
IGR	The group of elements for which the length has to be adjusted
INODE	The node at which the tension is to be computed, preferably corresponding to one end of the mooring line. If 0, compute the average tension in the group of elements IGR
Kp	Gain of the PID controller, in m/N
Td	Derivative time of the PID controller, in s
Ti	Integral time of the PID controller, in s
Lmin	Minimum allowable line length
Lmax	Optional Maximum allowable line length
Vmax	Optional : maximum allowable rate of change of the line length, in m/s, corresponding to the winch capacity.
Vmin	Optional : minium allowable rate of change of the line length, in m/s, corresponding to the winch capacity
DLLFileName	DLL file name
DLLProcName	DLL procedure name