USET1

USET1 – Set of Degrees of Freedom for Residual Vector Calculation, Alternate Form

Defines a set of degrees of freedom.

Field	Contents
SNAME	Set name (Character, only U6, ZEROU6 are allowed)
C	Component number. (Integer zero or blank for scalar points, or up to 6 unique digits (0 < integer < 6) may be placed in the field with no embedded blanks for grid points. The components refer to the coordinate system referenced by the grid points.)
Gi	Grid or scalar point identification numbers. (Integer > 0, for THRU option, G1 < G2)

Comments

If the alternate format is used, all points in the sequence G1 through G2 are not required to exist, but there must be at least one boundary degree of freedom for the model or a fatal error will result. Any grids implied in the THRU that do not exist will collectively produce a warning message, but will otherwise be ignored.
If SNAME=ZEROU6, then the degrees of freedom are omitted from the set.
USET1 is applied to normal modes analysis subcases that have the case control RESVEC=YES specified. In such cases, residual vectors are calculated using the unit load method. The residual vectors are then exported together with the eigenvectors.
If SNAME is not U6 or ZEROU6, USET1 will be ignored.
When the I/O option SPSYNTAX is set to CHECK (the default) or MIXED, it is allowed that when grid lists are provided for a given component, that the grid references be either scalar points (SPOINT) or structural grid points (GRID) when the component is 0, 1 or blank; interpreting all of these as 0 for scalar points and as 1 for structural grids. When SPSYNTAX is set to STRICT it is required for grid/component pairs (G#/C#) that the component be 0 or blank when the grid references are to scalar points (SPOINT), and that the component be > 1 when the grid references are to structural grid points (GRID). When the component is greater than 1, the grid references must always be a structural grid (GRID).

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