*HEADING
[ACIN2DN, edge-surface impedances]
*preprint,model=yes,history=yes,echo=yes
********************************
*part,name=plates
*NODE, NSET=first
*********************************
*NSET,NSET=ALLNODES
FIRST,
*element,type=b21,elset=mass
*element,type=b22,elset=mass
*surface,name=sm1
201,sneg
*surface,name=sm2
202,sneg
*BEAMSECTION,MATERIAL=METAL,ELSET=MASS,SECTION=RECT
*end part
********************************
*part,name=aco
*NODE, NSET=first
*NSET,NSET=ALLNODES
FIRST,
*NSET,NSET=QA_TEST
*element,type=acin2d2,elset=inf2
*element,type=acin2d3,elset=inf3
*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
*end instance
*instance,name=withEdgeZ,part=aco
*end instance
*instance,name=PnoneEdgeZ,part=plates
*end instance
*instance,name=noneEdgeZ,part=aco
*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=Half_Zmat
*MATERIAL,NAME=AIR320
*DENSITY
1.25,
*ACOUSTIC MEDIUM,BULK MODULUS
*material,name=metal
*density
7800.0,
*elastic
200.0e9,0.3
*************************************
*STEP,inc=1000
*STEADYSTATEDYNAMICS,direct,frequency=linear
*simpedance
assy1.withEdgeZ.acine2,Half_Zmat
assy1.withEdgeZ.acine3,Half_Zmat
*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