NX Nastran DMAP Programmer's Guide - Kxcad.net

DDR2
Computes displacements due to mode acceleration
{ ue} is placed in data block UEVF. Subroutines CALCV and SSG2A perform this
calculation. If supports are present, then:
a
ua Solve for { } :
a
{ Pl }
{ ua }
This is accomplished in subroutine FBSDRV. If supports are present, then:
a
a
Eq. 4-10
Eq. 4-11
Eq. 4-12
Eq. 4-13
otherwise, { ua} = { ul } .Subroutine SDR1B performs this calculation. If extra points
are present, then:
Note: If the problem type is transient, must be merged with and { }
.
P l
⎧ ⎫
→ ⎨----- ⎩P ⎬
r ⎭
u l
⎧ ⎫
→ ⎨----- ⎩P ⎬
r ⎭
[ Lll] [ Lll] T { ul } = { Pl }
a
{ ua} =
a
ul a
⎧{ } + [ D]
{ ur } ⎫
⎨------------------------------------------ ⎩ u
⎬
r ⎭
a
{ ud }
a
ua ⎧ ⎫
← ⎨----- ⎩u ⎬
e ⎭
a
ud a
{ } u · { d}
u ·· d
Eq. 4-14
879