*HEADING
** 
*PREPRINT, ECHO=NO, MODEL=NO, HISTORY=NO
*NODE,NSET=BEAMS,SYSTEM=C
      25001,4.0,90.0,0.0
      25071,4.0,-90.0,0.0
********************************
*NODE,NSET=STIFFNER
55,0.0,-2.0
65,1.0,-2.0
75,3.0,-1.1
*****
*NGEN,NSET=BEAMS,LINE=C
 25001,25071,1,,0,0,0,0,0,-1
*NSET,NSET=OUT
 25001, 25071, 25036,75
*NSET,NSET=P_OUT
1,21,41,1001,1021,1041 
****************************
*NODE,NSET=INNER,SYSTEM=C
1,4.0,90.0,0.0
41,4.0,-90.0,0.0
*NGEN,NSET=INNER,LINE=C
1,41,1,,0,0,0,0,0,-1
*****************************
*NODE,NSET=OUTER,SYSTEM=C
2001,8.0,90.0,0.0
2041,8.0,-90.0,0.0
*NGEN,NSET=OUTER,LINE=C
2001,2041,1,,0,0,0,0,0,-1
*****************************
*NFILL,NSET=ACOUSTIC
INNER,OUTER,20,100
**********************************
*ELEMENT,TYPE=B21,ELSET=BEAMS
2001, 25001,25002
*ELGEN,ELSET=BEAMS
2001,70,1,1
*ELEMENT,TYPE=B21,ELSET=STIFFNER
3001,55,65
4001,65,25060
5001,75,25048
6001,75,25040
******************
*ELEMENT, TYPE=AC2D4,ELSET=ACOUSTIC
1,1,2,102,101
*ELGEN, ELSET=ACOUSTIC
1,40,1,1,20,100,40
****************************
*ELGEN,ELSET=SECONDARY
1,40,1,1
*SURFACE,TYPE=ELEMENT,NAME=SECONDARY
SECONDARY,S1
*SURFACE,TYPE=ELEMENT,NAME=MAIN
BEAMS,SPOS
*TIE,NAME=COUPLING
SECONDARY,MAIN
************************************
*MATERIAL,NAME=WATER
*DENSITY
1000.0, 
*ACOUSTIC MEDIUM,BULK MODULUS
2.25E9,
*SOLID SECTION,MATERIAL=WATER,ELSET=ACOUSTIC
0.1,
*******************
*BEAM SECTION,MATERIAL=MAT1,ELSET=BEAMS,SECTION=RECT
0.1,0.1
*BEAM SECTION,MATERIAL=MAT1,ELSET=STIFFNER,SECTION=RECT
0.1,0.1
*MATERIAL,NAME=MAT1
*ELASTIC
207E9,0.3
*DENSITY
7800
*************************
*ELSET,ELSET=OUTER,GENERATE
761,800,1
*SURFACE,NAME=OUTER
OUTER,S3
****************************
*STEP,INC=1000
*Frequency, eigensolver=ams, acoustic coupling=proj, normalization=MASS
, , 600.,
*OUTPUT,FIELD,FREQ=0
*restart, write
*END STEP
************************
*step
*steadystatedynamics,interval=range
1.0,300,200
***SIMPEDANCE,NONREFLECTING=CIRC,OP=NEW
**OUTER,8.0
*cload
65,2,100.0
*output,history
*node output,nset=stiffner
uT,
*endstep