*HEADING
: MODEL CHANGE ACOUSTICS TESTS  [AC2D6]
*PREPRINT,ECHO=YES,MODEL=YES,HISTORY=YES
*NODE, Nset=ODB_NSET
1, 
41,,10.
1001,1.
1041,1.,10.
300,0.5,0.5
309,0.5,9.5
*NGEN,NSET=NALL1
1,41
*NGEN,NSET=NALL2
1001,1041
*NGEN,NSET=NALL3
300,309
*NFILL,NSET=NALL
NALL1,NALL2,2,500
*ELEMENT, TYPE=AC2D6,ELSET=EALL
  200,    1, 1001, 1005,  501, 1003,  300,
  201, 1005,    5,    1,  505,    3,  300,
  202,    5, 1005, 1009,  505, 1007,  301,
  203, 1009,    9,    5,  509,    7,  301,
  204,    9, 1009, 1013,  509, 1011,  302,
  205, 1013,   13,    9,  513,   11,  302,
  206,   13, 1013, 1017,  513, 1015,  303,
  207, 1017,   17,   13,  517,   15,  303,
  208,   17, 1017, 1021,  517, 1019,  304,
  209, 1021,   21,   17,  521,   19,  304,
  210,   21, 1021, 1025,  521, 1023,  305,
  211, 1025,   25,   21,  525,   23,  305,
  212,   25, 1025, 1029,  525, 1027,  306,
  213, 1029,   29,   25,  529,   27,  306,
  214,   29, 1029, 1033,  529, 1031,  307,
  215, 1033,   33,   29,  533,   31,  307,
  216,   33, 1033, 1037,  533, 1035,  308,
  217, 1037,   37,   33,  537,   35,  308,
  218,   37, 1037, 1041,  537, 1039,  309,
  219, 1041,   41,   37,  541,   39,  309,
*ELSET,ELSET=SECOND,GENERATE
210,219
*MATERIAL,NAME=AIR
*DENSITY
1.293, 
*ACOUSTIC MEDIUM,BULK MODULUS
1.42176E5, 
*SOLID SECTION,MATERIAL=AIR,ELSET=EALL
*NSET,NSET=RECRD,GEN
1,21
*NSET,NSET=DRIV
1, 
**************************************
*Elset,Elset=ODB_ESET
SECOND, EALL
**
**
*Nset, Nset=ODB_NSET
ODB_NSET, NALL, RECRD, DRIV
**
**
*STEP
*STEADY STATE DYNAMIC,DIRECT
1., 
*IMPEDANCE
219,I1,
*BOUNDARY
DRIV,8,,1.
*NODE PRINT,NSET=RECRD
POR,PPOR
*NODE FILE,NSET=RECRD
POR,PPOR
*OUTPUT,FIELD,VARIABLE=PRESELECT,OP=ADD,FREQUENCY=9999
*OUTPUT,FIELD, OP=ADD
*NODE OUTPUT,NSET=RECRD
POR,
*OUTPUT,HISTORY,OP=ADD
*NODE OUTPUT,NSET=RECRD
POR,
*ENDSTEP
**************************************
*STEP
*STATIC
1,1
*MODEL CHANGE,REMOVE
SECOND,
*ENDSTEP
**************************************
*STEP
*STEADY STATE DYNAMIC,DIRECT
1., 
*IMPEDANCE,OP=NEW
209,I1,
*BOUNDARY
DRIV,8,,1.
*NODE PRINT,NSET=RECRD
POR,PPOR
*NODE FILE,NSET=RECRD
POR,PPOR
*OUTPUT,FIELD, OP=ADD
*NODE OUTPUT,NSET=RECRD
POR,
*OUTPUT,HISTORY,OP=ADD
*NODE OUTPUT,NSET=RECRD
POR,
*ENDSTEP