NX Nastran DMAP Programmer's Guide - Kxcad.net

BNDSPC Processes constraints on superelement boundaries
BNDSPC
Processes constraints on superelement boundaries
Processes constraints and enforced displacements applied on superelement
boundaries.
Format:
BNDSPC SEMAP,USET,BGPDT,YS,YSD/
USET1,YS1/
SEID/NLOADS $
Input Data Blocks:
SEMAP Superelement map table.
USET Degree-of-freedom set membership table.
BGPDT Basic grid point definition table for the current superelement.
YS Matrix of enforced displacements.
YSD Accumulated matrix of enforced displacements from upstream
superelements.
Output Data Blocks:
USET1 USET updated with constraints from upstream superelements.
YS1 YS updated with enforced displacements from upstream
superelements.
Parameters:
SEID Integer-input-default=0. Superelement identification number.
NLOADS Integer-input-default=0. The number of subcase records contiguous
with respect to the MPC and SPC command in the first subcase of the
current boundary condition.
Remarks:
1. BNDSPC will perform one of three possible operations, depending on the
coordinate system alignment at the boundary:
a. Allow the SPC to be applied in the current superelement.
b. Move the constraint to a downstream superelement.
c. Issue a fatal error due to incompatible coordinate systems.
2. YS cannot be purged.
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