*HEADING
IMPEDANCE PROPERTY  [AC3D4]
***************************
*PARAMETER
f=100.0
T=5/f
omega=2*3.14159*f
***************************
*NODE, Nset=ODB_NSET
*NGEN,NSET=ALL_NODES
*ELEMENT,TYPE=AC3D4,ELSET=ALL_ELEMENTS
*ELGEN,ELSET=ALL_ELEMENTS
*elset,elset=liner4
*elset,elset=liner6
*MATERIAL,NAME=AIR
*DENSITY
1.293,
*ACOUSTIC MEDIUM,BULK MODULUS
*SOLID SECTION,MATERIAL=AIR,ELSET=ALL_ELEMENTS
*IMPEDANCE PROPERTY,NAME=IMPED
*NSET,NSET=OUTPUT_NODES,GEN
*NSET,NSET=DRIVEN_NODES
**
*NSET, NSET=MID
*NSET, NSET=ODB_NSET
ODB_NSET, MID
*NSET, NSET=QA_TEST
ODB_NSET
**
*AMPLITUDE,NAME=SINE,DEF=PERIODIC
1,<omega>,0.0,0.0
0,1,0,0
*STEP
*DYNAMIC,EXPLICIT
,<T>
*BULK VISCOSITY
*IMPEDANCE
liner4,I4,imped
liner6,I2,imped
*BOUNDARY, AMP=SINE
DRIVEN_NODES,8,,1.
*OUTPUT,FIELD,NUMBER INTERVAL=1
*NODE OUTPUT
POR,
*NODE OUTPUT,NSET=QA_TEST
POR,
***OUTPUT,HISTORY,FREQ=1
***NODE OUTPUT,NSET=ODB_NSET
**POR,
*ENDSTEP