*HEADING
IMPEDANCE PROPERTY  [AC3D6]
***************************
*PARAMETER
f=100.0
T=5/f
omega=2*3.14159*f
***************************
*NODE, Nset=ODB_NSET
*NGEN,NSET=ALL_NODES
*ELEMENT,TYPE=AC3D6,ELSET=ALL_ELEMENTS
*ELGEN,ELSET=ALL_ELEMENTS
*ELSET,ELSET=LINER5
*MATERIAL,NAME=AIR
*DENSITY
1.293,
*ACOUSTIC MEDIUM,BULK MODULUS
*SOLID SECTION,MATERIAL=AIR,ELSET=ALL_ELEMENTS
*IMPEDANCE PROPERTY,NAME=IMPED
*NSET,NSET=RECRD,GEN
*NSET,NSET=DRIVEN_NODES
**
*NSET, NSET=MID
*NSET, NSET=ODB_NSET
ODB_NSET, MID
*AMPLITUDE,NAME=SINE,DEF=PERIODIC
1,<omega>,0.0,0.0
0,1,0,0
*STEP
*DYNAMIC,EXPLICIT
,<T>
*BULK VISCOSITY
*IMPEDANCE
LINER5,I5,IMPED
*BOUNDARY, AMP=SINE
DRIVEN_NODES,8,,1.
*OUTPUT,FIELD,NUM=1
*NODE OUTPUT
POR,
*OUTPUT,HISTORY,FREQ=1
*NODE OUTPUT,NSET=ODB_NSET
 POR,
*ENDSTEP