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!EQUATION

Definition of constrained node groups

1st line

!EQUATION [, optional parameter]
Parameter
INPUT External filename (optional)
Parameter name Parameter value Description
INPUT <filename> External filename (optional); may also be used together with the 2nd and subsequent lines

2nd line and subsequent lines

(2nd line) NEQ, CONST

(3rd line and subsequent lines) nod1, DOF1, A1, nod2, DOF2, A2 ... (up to seven items per line)
Repeat thereafter
Variable Type Description
NEQ I Number of terms in the equation
CONST R Constant term of the equation (right-hand-side value)
nod1 I/C 1st node or node group
DOF1 I Constrained degree of freedom of the 1st node or node group
A1 R Coefficient of the 1st node or node group
nod2 I/C 2nd node or node group
DOF2 I Constrained degree of freedom of the 2nd node or node group
A2 R Coefficient of the 2nd node or node group

Notes

  • If a node or node group not defined by !NODE is specified, it is ignored and a warning message is displayed.
  • If nod1=nod2, it is ignored and a warning message is displayed.
  • When node groups are specified, an inconsistency in the number of nodes results in an error.
  • Degree-of-freedom numbers depend on the analysis type and element. An inconsistent degree of freedom is ignored and a warning message is displayed.

Example

!EQUATION
3
101, 1, 1.0, 102, 1, -1.0, 103, 1, -1.0
2
NG1, 2, 1.0, NG5, 2, -1.0