*HEADING
ABAQUS/Explicit:SUBMODEL [AC3D4]
**********************************************
** The speed of sound c=sqrt(K/rho)=330m/s  
** The pressure wave will reach teh bottom nodes
** (and it will drive the pressure wave farther)
** in about t=8.0/c=0.024 sec
**********************************************
*PARAMETER
f=25.0
T=1.0/f
out_hist=T/100
omega=2*3.14159*f
******************
*NODE,NSET=BOT
1,0.0,8.5
101,0.5,8.5
201,1.0,8.5
1001,0.0,8.5,0.5
1101,0.5,8.5,0.5
1201,1.0,8.5,0.5
2001,0.0,8.5,1.0
2101,0.5,8.5,1.0
2201,1.0,8.5,1.0
*NODE,NSET=TOP
7,0.0,10.0
107,0.5,10.
207,1.0,10.
1007,0.0,10.0,0.5
1107,0.5,10.0,0.5
1207,1.0,10.0,0.5
2007,0.0,10.0,1.0
2107,0.5,10.0,1.0
2207,1.0,10.0,1.0
*NSET,NSET=QA_TEST
TOP,BOT
*NFILL,NSET=ALL
BOT,TOP,6,1
*NSET,NSET=RECRD
1,2,3,4,5,6,7
*ELSET,ELSET=LINER1
35,135,735,835
*ELSET,ELSET=LINER2
36,136,736,836
*ELEMENT,TYPE=AC3D4,ELSET=EALL
    1,    1,  101,  102, 1001
    2,  101,  102, 1001, 1101
    3,  102, 1001, 1101, 1102
    4,    1,  102,    2, 1001
    5,  102,    2, 1001, 1102
    6,    2, 1001, 1102, 1002
*ELGEN,ELSET=EALL
1,6,1,6, 2,100,100,2,1000,700
2,6,1,6,2,100,100,2,1000,700
3,6,1,6,2,100,100,2,1000,700
4,6,1,6,2,100,100,2,1000,700
5,6,1,6,2,100,100,2,1000,700
6,6,1,6,2,100,100,2,1000,700
*MATERIAL,NAME=AIR
*DENSITY
1.293, 
*ACOUSTIC MEDIUM,BULK MODULUS
1.42176E5, 
*SOLID SECTION,MATERIAL=AIR,ELSET=EALL
*SUBMODEL,EXT=0.025
BOT, 
*AMPLITUDE,NAME=SINE,DEF=PERIODIC
1,<omega>,0.0,0.0
0,1,0,0
*STEP
*DYNAMIC,EXPLICIT
,<T>
*IMPEDANCE
LINER1,I2
LINER2,I4
*BOUNDARY,SUBMODEL,STEP=1
BOT,8,8
*********************
*FILE OUTPUT,NUM=1
*NODE FILE
POR,
*********************
*OUTPUT,FIELD,NUM=1
*NODE OUTPUT,NSET=QA_TEST
POR,
*********************
*OUTPUT,FIELD,NUM=4
*NODE OUTPUT
POR,
*********************
*OUTPUT,HISTORY,TIME INTERVAL=<out_hist>
*NODE OUTPUT,NSET=ALL
POR,
*********************
*END STEP