Hi,
I'm a bit lost with the SPC sets.
I have to apply a time dependent displacement on a node (802 035 in my model). As I understand, the HM has to create a constraint on the same node to make the solver work. So in my model I have the general boundary conditions (embedded nodes including the excitation node) and this specific constraint due to the displacement excitation on the excitation node. My model .fem file thus contains :
SPC 1 7948 123456 0.0 $BC
SPC 1 7949 123456 0.0 $BC
SPC 1 7950 123456 0.0 $BC
SPC 1 7951 123456 0.0 $BC
SPC 1 7952 123456 0.0 $BC
SPC 1 7953 123456 0.0 $BC
SPC 1 7954 123456 0.0 $BC
SPC 1 802035 123456 0.0 $excitation node
I have another fem file tu run the study :
$$------------------------------------------------------------------------------$
$$ I/O Option
$$------------------------------------------------------------------------------$
TITLE=p21-pdb-slush_MTR_S2_11
METHOD(STRUCTURE)=1
SDISP(SORT2,PUNCH)=1
SPC=7
CPU=6
SCREEN OUT
output,HM,NONE
$$------------------------------------------------------------------------------$
$$ Case Control Cards $
$$------------------------------------------------------------------------------$
SUBCASE 1
LABEL NM_200hz
ANALYSIS MODES
DISPLACEMENT(H3D,MODAL,,,) =1
$$
$$
SUBCASE 2
LABEL MTR_S2
ANALYSIS MTRAN
RESVEC(APPLOAD)=YES
DLOAD=9
TSTEP=11
SDAMPING(STRUCTURE)=999
DISPLACEMENT(PUNCH,,,)=1
$$------------------------------------------------------------------------------$
$$ Bulk Data
$$------------------------------------------------------------------------------$
$$
$$
BEGIN BULK
PARAM,AUTOSPC,YES
PARAM,CHECKEL,NO
$PARAM,G,0.08
$$
$$
$-------2-------3-------4-------5-------6-------7-------8-------9------X
SPCADD,7,1
DLOAD,9,1.0,1.0,23,1.0,24,1.0,25
EIGRL,1,0.0,200.0,,,,,MASS
TSTEP,11,10000,0.001,2
TABDMP1,999,G
+,1.0,0.03,500.0,0.03,ENDT
$$
$$
$$
$-------2-------3-------4-------5-------6-------7-------8-------9------X
SPCD,20,802035,1,1.0
TLOAD1,23,20,,DISP,904043
$$
$$
$$
$-------2-------3-------4-------5-------6-------7-------8-------9------X
SPCD,21,802035,2,1.0
TLOAD1,24,21,,DISP,904044
$$
$$
$$
$-------2-------3-------4-------5-------6-------7-------8-------9------X
SPCD,22,802035,3,1.0
TLOAD1,25,22,,DISP,904045
$$
$$
INCLUDE 'signal_S2.dat' $excitation signal
INCLUDE 'mesh_Squeak.fem' $model file
ENDDATA
Do you think it's correct? Or I have to create 2 SPC sets in my model : general boundary conditions and constraint due to the excitation?
I hope I was clear,
Thank you
