*HEADING
**
*PREPRINT, ECHO=NO, MODEL=NO, HISTORY=NO
*NODE,NSET=BEAMS,SYSTEM=C
********************************
*NODE,NSET=STIFFNER
*****
*NGEN,NSET=BEAMS,LINE=C
*NSET,NSET=OUT
*NSET,NSET=P_OUT
****************************
*NODE,NSET=INNER,SYSTEM=C
*NGEN,NSET=INNER,LINE=C
*****************************
*NODE,NSET=OUTER,SYSTEM=C
*NGEN,NSET=OUTER,LINE=C
*****************************
*NFILL,NSET=ACOUSTIC
INNER,OUTER,20,100
**********************************
*ELEMENT,TYPE=B21,ELSET=BEAMS
*ELGEN,ELSET=BEAMS
*ELEMENT,TYPE=B21,ELSET=STIFFNER
******************
*ELEMENT, TYPE=AC2D4,ELSET=ACOUSTIC
*ELGEN, ELSET=ACOUSTIC
****************************
*ELGEN,ELSET=SLAVE
*SURFACE,TYPE=ELEMENT,NAME=SLAVE
SLAVE,S1
*SURFACE,TYPE=ELEMENT,NAME=MASTER
BEAMS,SPOS
*TIE,NAME=COUPLING
SLAVE,MASTER
************************************
*MATERIAL,NAME=WATER
*DENSITY
1000.0,
*ACOUSTIC MEDIUM,BULK MODULUS
*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
*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
***SIMPEDANCE,NONREFLECTING=CIRC,OP=NEW
**OUTER,8.0
*cload
65,2,100.0
*output,history
*node output,nset=stiffner
uT,
*endstep