4.8.3.20. GET_FFLEX_NODETVEL

GET_FFLEX_NODETVEL subroutine returns a velocity vector for a node of FFlex body. This is an auxiliary subroutine for Nodal_Force and Nodal_Force_Ext.

Table 4.85 Function Name
Language type	Subroutine
FORTRAN	call get_fflex_nodetvel (ifbody,NodeSeq,MKID,nMK,Vel,ErrFlg)
C/C++	get_fflex_nodetvel (ifbody,NodeSeq,MKID[2],2,Vel,&Errflg)

Table 4.86 Parameter information
Variable Name	Size	Description
ifbody	int	Sequential id of FFlex body defined in RecurDyn/Solver. This is a related argument with the 5^th argument of Nodal_Force_Ext subroutine.
NodeSeq	int	Node sequential id defined in RecurDyn/Solver. This is a related argument with the 6^th argument of Nodal_Force_Ext subroutine.
MKID	int[2]	An array of integer type. Each value should be zero or a marker id. 1^st value is defined as base marker. 2^nd value is defined as reference marker.
nMK	int	An integer variable for considering base and reference marker. If nMK is 0, then the subroutine returns a global velocity vector of NodeSeq. If nMK is 1, then the subroutine calculates a velocity vector considering base marker. If nMK is 2, then the subroutine calculates a velocity vector considering base and reference marker.
Vel	double[3]	An array of double precision type. The array size must be 3. 3 values mean a relative velocity vector. \(\frac{d}{dt}\left\{ \mathbf{A}_{r}^{T}({{\mathbf{r}}_{FFlexNode}}-{{\mathbf{r}}_{b}}) \right\}\) Where, \(\mathbf{A}_{r}^{{}}\) is a orientation matrix of the reference marker (=MKID[1]). \({{\mathbf{r}}_{FFlexNode}}\) is a global position vector of NodeSeq. \({{\mathbf{r}}_{b}}\) is a global position vector of the base marker (=MKID[0]).
Errflg	int	Error flag. If the result of this argument is -1 (means TRUE in Fortran logical value), there is no error. The others mean that there is an error.

Code Example

Refer to GET_FFLEX_NODEPOS.