*HEADING
*node,nset=plate
*element,type=b21,elset=mass
*surface,name=sm1
1,sneg
*beam section, material=metal,elset=mass,section=circ
0.05,
**
**
*node
*element,type=ac2d4r,elset=ac2d
*element,type=acin2d2,elset=acin2d
*elset,elset=ac
ac2d,acin2d
*surface,name=ac2d
11,s1
*surface,name=acine
21,e1
**21,s3
*surface,name=ac2d42
11,s2
11,s4
*solid section,elset=ac,material=air
1.0,0.0,0.5,0.0
*tie,name=tie
ac2d,sm1
*impedance property,name=halfzmat
*material,name=air
*acoustic medium
*density
1.25
*material,name=metal
*elastic
2.e11,0.3
*density
7800.
*amplitude,definition=perio,name=TenPiHz
1,5.0,0.0, 0.0
0.0,1.0,0.0,0.0
**
**
*nset,nset=out
*step
*dynamic,explicit
,5.
*simpedance
acine,halfzmat
ac2d42,halfzmat
*boundary,type=acceleration,amplitude=tenpihz
plate,1,1,1.e-2
plate,2,6
*output,history
*node output, nset=out
por,
*end step