*HEADING
[ACIN2DN, edge-surface impedances]
*preprint,model=yes,history=yes,echo=yes
********************************
*part,name=plates
*NODE, NSET=first
1, 1., 0., 0.,  1,0,0
2, 1., 1., 0.,  1,0,0
3, 1., 2., 0.,  1,0,0
4, 1., 3., 0.,  1,0,0
5, 1., .5, 0.,  1,0,0
6, 1.,1.5, 0.,  1,0,0
7, 1.,2.5, 0.,  1,0,0
*********************************
*NSET,NSET=ALLNODES
FIRST,
*element,type=b21,elset=mass
201,1,2
*element,type=b22,elset=mass
202,3,7,4
*surface,name=sm1
201,sneg
*surface,name=sm2
202,sneg
*BEAMSECTION,MATERIAL=METAL,ELSET=MASS,SECTION=RECT
0.05,0.05,
0., 0.,  -1.
3,
*end part
********************************
*part,name=aco
*NODE, NSET=first
1, 1., 0., 0.,  1,0,0
2, 1., 1., 0.,  1,0,0
3, 1., 2., 0.,  1,0,0
4, 1., 3., 0.,  1,0,0
5, 1., .5, 0.,  1,0,0
6, 1.,1.5, 0.,  1,0,0
7, 1.,2.5, 0.,  1,0,0
*NSET,NSET=ALLNODES
FIRST,
*NSET,NSET=QA_TEST
2,4
*element,type=acin2d2,elset=inf2
1,  2,1
*element,type=acin2d3,elset=inf3
2, 4,3,7,
*surface,name=acinE2
1,e1
*surface,name=acinS2
1,spos
*surface,name=acine3
2,e1
*surface,name=acins3
2,spos
***************************************
*SOLID SECTION,MATERIAL=AIR320,ELSET=INF2
1.0, 0.0,0.5,.0
*SOLID SECTION,MATERIAL=AIR320,ELSET=INF3
1.0, 0.0,2.5,.0
*endpart
***************************************
*assembly,name=assy1
*instance,name=PwithEdgeZ,part=plates
0.0,0.0,0.0
*end instance
*instance,name=withEdgeZ,part=aco
0.0,0.0,0.0
*end instance
*instance,name=PnoneEdgeZ,part=plates
0.0,-4,0.0
*end instance
*instance,name=noneEdgeZ,part=aco
0.0,-4,0.0
*end instance
*tie,name=quad4
withEdgeZ.acins2,PwithEdgeZ.sm1
noneEdgeZ.acins2,PnoneEdgeZ.sm1
withEdgeZ.acins3,PwithEdgeZ.sm2
noneEdgeZ.acins3,PnoneEdgeZ.sm2
*end assembly
*************************************
** MATERIAL IMPEDANCE FOR AIR320 IS 400.0
** THE ADMITTANCE FOR HALF THIS VALUE IS USED
**
*impedance property,name=HalfZmat
0.0, 0.005
*MATERIAL,NAME=AIR320
*DENSITY
1.25, 
*ACOUSTIC MEDIUM,BULK MODULUS
1.28E5,
*material,name=metal
*density
7800.0,
*elastic
200.0e9,0.3
*************************************
*STEP,inc=1000
*STEADYSTATEDYNAMICS,direct,frequency=linear
1.,200.,20
*simpedance,property=HalfZmat
assy1.withEdgeZ.acine2,
assy1.withEdgeZ.acine3,
*BOUNDARY,type=acceleration
ASSY1.PWITHEDGEZ.ALLNODES,1,1,1.0e-4
ASSY1.PNONEEDGEZ.ALLNODES,1,1,1.0e-4
*BOUNDARY
ASSY1.PWITHEDGEZ.ALLNODES,2,6,0.0
ASSY1.PNONEEDGEZ.ALLNODES,2,6,0.0
*OUTPUT,HISTORY,FREQUENCY=1
*NODE OUTPUT,NSET=WITHEDGEZ.QA_TEST
POR,
*NODE OUTPUT,NSET=NONEEDGEZ.QA_TEST
POR,
*OUTPUT,FIELD,FREQUENCY=99999
*ELEMENT OUTPUT
*END STEP