*HEADING
: MODEL CHANGE ACOUSTICS TESTS  [ACIN2D2]
*PREPRINT,ECHO=YES,MODEL=YES,HISTORY=YES
*restart,write
*NODE, Nset=ODB_NSET
*NGEN,NSET=NALL
*ELEMENT,TYPE=AC2D4,ELSET=EALL
*ELGEN,ELSET=EALL
**************************************
*ELEMENT,TYPE=ACIN2D2,ELSET=INF
*ELSET,ELSET=SECOND
*MATERIAL,NAME=AIR
*DENSITY
1.293,
*ACOUSTIC MEDIUM,BULK MODULUS
*SOLID SECTION,MATERIAL=AIR,ELSET=EALL
*SOLID SECTION,MATERIAL=AIR,ELSET=INF
1., 0.,0.,0.
*IMPEDANCE PROPERTY,TYPE=C,NAME=BGT
*NSET,NSET=QA_TEST,GEN
*NSET,NSET=DRIV
**************************************
*Elset,Elset=ODB_ESET
SECOND, EALL
**
**
*Nset, Nset=ODB_NSET
ODB_NSET, NALL, QA_TEST, DRIV
**
**
*STEP
SECTOR USING INFINITE ELEMENT
*STEADY STATE DYNAMIC,DIRECT
*BOUNDARY
DRIV,8,,1.
*NODE PRINT,NSET=QA_TEST
POR,
*ENERGYPRINT
*OUTPUT,FIELD
*ELEMENTOUTPUT
ENER,INTEN,ELEN
*NODE OUTPUT
POR,
*OUTPUT,HISTORY
*NODE OUTPUT,NSET=QA_TEST
POR,
*ENDSTEP
**************************************
*STEP
DUMMY STEP TO EXECUTE CHANGE OF MODEL
*STATIC
1,1
*MODEL CHANGE,REMOVE
SECOND,
*OUTPUT,FIELD,VAR=PRESELECT
*ENDSTEP
**************************************
*STEP
SHORTENED SECTOR USING IMPEDANCE
*STEADY STATE DYNAMIC,DIRECT
*IMPEDANCE,OP=NEW
15,I3,BGT
*BOUNDARY
DRIV,8,,1.
*NODE PRINT,NSET=QA_TEST
POR,
*ENERGYPRINT
*OUTPUT,FIELD
*ELEMENTOUTPUT
ENER,INTEN,ELEN
*NODE OUTPUT
POR,
*OUTPUT,HISTORY
*NODE OUTPUT,NSET=QA_TEST
POR,
*ENDSTEP