*HEADING
IMPEDANCE PROPERTY  [AC3D4]
***************************
*PARAMETER
f=100.0
T=5/f
omega=2*3.14159*f
***************************
*NODE, Nset=ODB_NSET
1, 
41,,10.
1001,1.
1041,1.,10.
2001,,,1.
2041,,10.,1.
3001,1.,,1.
3041,1.,10.,1.
*NGEN,NSET=ALL_NODES
1,41
1001,1041
2001,2041
3001,3041
*ELEMENT,TYPE=AC3D4,ELSET=ALL_ELEMENTS
    1,    1,    3, 2003, 1001
    2,    3, 2003, 1001, 1003
    3, 2003, 1001, 1003, 3003
    4,    1, 2003, 2001, 1001
    5, 2003, 2001, 1001, 3003
    6, 2001, 1001, 3003, 3001
*ELGEN,ELSET=ALL_ELEMENTS
1,20,2,6
2,20,2,6
3,20,2,6
4,20,2,6
5,20,2,6
6,20,2,6
*elset,elset=liner4
4, 
*elset,elset=liner6
6, 
*MATERIAL,NAME=AIR
*DENSITY
1.293, 
*ACOUSTIC MEDIUM,BULK MODULUS
1.42176e5, 
*SOLID SECTION,MATERIAL=AIR,ELSET=ALL_ELEMENTS
*IMPEDANCE PROPERTY,NAME=IMPED
0.0,2.332317E-3
*NSET,NSET=OUTPUT_NODES,GEN
1,41
*NSET,NSET=DRIVEN_NODES
41,1041,2041,3041
**
*NSET, NSET=MID
23, 1023, 33, 1033, 13, 1013
*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
0.000,
*IMPEDANCE,prop=imped
liner4,I4,
liner6,I2,
*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