*HEADING
ECA8AFE1T: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED 1-ELEMENT MESH  [ACAX8(T)]
*NODE, Nset=ODB_NSET
*NGEN,NSET=LEFT
*NGEN,NSET=RIGHT
*NGEN,NSET=BOT
*NGEN,NSET=TOP
*NGEN, Nset=ODB_NSET
**		QUADRILATERAL ELEMENT DEGENERATED TO TRIANGLE
*ELEMENT,TYPE=ACAX8,ELSET=ALL
*SOLID SECTION,MATERIAL=ALL,ELSET=ALL
*MATERIAL,NAME=ALL
*DENSITY
 1.,
*ACOUSTIC MEDIUM,BULK MODULUS
**
** Sets added by addodb
**
*Elset,Elset=ODB_ESET
ALL,
**
**
*Nset, Nset=ODB_NSET
ODB_NSET, LEFT, RIGHT, BOT
TOP,
**
**
*STEP
*FREQUENCY, eigensolver=lanczos, SIM=NO
9, , ,-1.E7
*MODAL FILE
*OUTPUT,FIELD,VARIABLE=PRESELECT,OP=ADD,FREQUENCY=9999
*OUTPUT,FIELD, OP=ADD
*MODAL OUTPUT,VARIABLE=ALL
*OUTPUT,HISTORY,OP=ADD
*MODAL OUTPUT,VARIABLE=ALL
*ENDSTEP