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!EQUATION

Definition of constrained node groups

First line

!EQUATION [, optional parameter]
Parameter
INPUT External file name (optional)
Parameter Value Description
INPUT <filename> External file name (optional); may also be used with the second and subsequent lines

Second and subsequent lines

(2nd line) NEQ, CONST

(3rd line and subsequent lines) nod1, DOF1, A1, nod2, DOF2, A2 ... (up to seven items per line)
Continue in the same format.
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 First node or node group
DOF1 I Constrained degree of freedom of the first node or node group
A1 R Coefficient of the first node or node group
nod2 I/C Second node or node group
DOF2 I Constrained degree of freedom of the second node or node group
A2 R Coefficient of the second 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