*node,nset=plate1
1,1.,0.,0.
2,1.,1.,0.
3,1.,0.,1.
4,1.,1.,1.
*element,type=s4r,elset=plate1
1,1,3,4,2
*surface,name=plate1
1,sneg
*shell section, material=metal,elset=plate1
0.05
**
**
*node,nset=plate2
101,1.,-2.,0.
102,1.,-1.,0.
103,1.,-2.,1.
104,1.,-1.,1.
*element,type=s4r,elset=plate2
101,101,103,104,102
*surface,name=plate2
101,sneg
*shell section, material=metal,elset=plate2
0.05
**
**
*node,nset=ac1
51,1.,0.,0.
52,1.,1.,0.
61,2.,0.,0.
62,2.,1.,0.
71,1.,0.,1.
72,1.,1.,1.
81,2.,0.,1.
82,2.,1.,1.
*element,type=ac3d8r,elset=ac1
11,61,81,82,62,51,71,72,52
*solid section,elset=ac1,material=ac
*surface,name=ac1
11,s2
*surface,name=ac1-sides
11,s3
11,s4
11,s5
11,s6
**
**
*node,nset=ac2
151,1.,-2.,0.
152,1.,-1.,0.
161,2.,-2.,0.
162,2.,-1.,0.
171,1.,-2.,1.
172,1.,-1.,1.
181,2.,-2.,1.
182,2.,-1.,1.
*element,type=ac3d8r,elset=ac2
111,161,181,182,162,151,171,172,152
*solid section,elset=ac2,material=ac
*surface,name=ac2
111,s2
*surface,name=ac2-sides
111,s3
111,s4
111,s5
111,s6
**
**
*element,type=acin3d4,elset=acin1
21,61,62,82,81
*solid section,elset=acin1,material=ac
1.0,0.,0.5,0.5
*surface,name=acin1-edges
21,E1
21,E2
21,E3
21,E4
**
**
*element,type=acin3d3,elset=acin2
121,161,182,181
122,161,162,182
*solid section,elset=acin2,material=ac
1.0,0.,-1.5,0.5
*surface,name=acin2-edges
121,E1
121,E2
122,E2
122,E3
**
**
*tie,name=t1
ac1,plate1
*tie,name=tie2
ac2,plate2
**
**
*impedance property,name=half_zmat
0.0,0.005
*material,name=ac
*acoustic medium
1.28e5
*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=output
ac1,ac2
**
*step
*dynamic,explicit
,5.
*simpedance,prop=half_zmat
acin1-edges,
acin2-edges,
ac1-sides,
ac2-sides,
*boundary,type=acceleration,amplitude=tenpihz
plate1,1,1,1.e-2
plate2,1,1,1.e-2
plate1,2,6
plate2,2,6
*output,history
*node output, nset=output
por,
*end step