Maximum of the total number of NODE data records that may be input is 200.
2 5 7 11 16 21 26 - --- -- ---- ----- ----- ----- ----- |X| | |NODE| | | | | - --- -- ---- ----- ----- ----- ----- | | | | | | | | | | | | | |_(4) Node Number (I5) | | | | | | | | | | | |_(3) Structure Number (I5) | | | | | | | | | |_(2) Node Number (I5) | | | | | | | |_(1) Structure Number (I5) | | | | | |_Compulsory Data Record Keyword (A4) | | | |_Optional User Identifier (A2) | |_Compulsory END on last data record in Data Category (A3)
(1) The structure number must correspond to one of the structures defined in Data Category 2. If '1' is input then this will correspond to the structure defined in Data Category ELM1. If '2' is input then this will correspond to the structure defined in Data Category ELM2, etc. As the NODE data record is a request for output of the position/motion of the node number specified (2), structure number '0' (i.e. a fixed node) is illegal in this field and will produce an error, since zero structure indicates a fixed node.
(2) This is the node number whose position/motions are requested during the analysis. The position of this node on the structure (1) must be defined in Data Category 1.
Note that these motions are with respect to the position defined by (3) and (4).
(3)-(4) This structure number and its corresponding node number (4) define the reference point for the positions/motions defined by parameters (1) and (2).
Both these fields may be left blank, in which case the program will assume that the output at the position defined by (1) and (2) is with respect to the origin of the Fixed Reference Axes, i.e. the ABSOLUTE values.
If '0' is input as the structure number (3), together with a node number (4), the program will recognize that this node number (4) references the fixed position as defined in Data Category 1 in the Fixed Reference Axis System (FRA). Note that a non-zero structure number (3) must be followed by a valid node number (4) on that structure.
Information Output at Nodal Positions
The input of the NODE data record is designed to enable the user to request the positions/motions of any point on a structure with respect to any other point, whether on a structure or fixed in space (i.e. the difference between the positions/motions of two points). For each NODE data record, the program outputs the results described below. In the following table, Node 1 refers to the structure/node defined in fields (1) and (2) above, and Node 2 refers to the structure/node defined in fields (3) and (4).
Solver | Output | |||
---|---|---|---|---|
Aqwa-Line | The RAOs of Node 1.
Note that:
| |||
Aqwa-Librium | The positions of Node 1 relative to Node 2 at each static equilibrium position found. | |||
Aqwa-Drift, Aqwa-Naut | The positions of Node 1 relative to Node 2 at each step in the time history. If the ALLM data record is also used, the velocities and accelerations of Node 1 relative to Node 2 at each time step are also reported. | |||
Aqwa-Fer | The RAOs and significant motions of Node 1 relative to Node 2. |