NX Nastran DMAP Programmer's Guide - Kxcad.net

SEMAP
Superelement Definition Table (Map)
4. The BITINFO in ENTRY=DWNCNCT indicates the downstream
superelement(s?).
Bit Number Downstream superelement is:
0 the residual structure
1 through NBRSE-1 the superelement(s) corresponding to the
INTIDX-th bit(s)
5. In ENTRY=GRIDMAP, bits are numbered left to right beginning with zero
and span LENTRY-1 words.
Bit number Meaning
0 grid is connected to the residual structure
1 through NBRSE-1 grid is connected to the superelement(s)
corresponding to the INTIDX-th bit(s)
NBRSE grid is a scalar point
NBRSE+1 grid is an incongruent boundary point
MAXBIT-IDBITS through MAXBIT internal superelement index (INTIDX) to
which grid is interior
6. where MAXBIT = NBPW*(LENTRY-1)-1, NBPW is the number of bits per
word, and "incongruent" indicates inconsistent coordinate systems on the
boundary point.
7. In RECORD=INFO The primary superelement exterior grids points are
sorted in the order of the secondary exterior grid points. Only if SEQSEP is
specified.
8. SELABEL is created by SEP1X only.
9. LENTRY is computed from IDBITS:
10. IDBITS is the minimum number of bits required to represent NBRSE.
IDBITS = int ( ln ( max (NBRSE,1)) + 1.01)
ln 2
ln 2
11. where ln is the natural logarithm and int is the integer function.
583