*HEADING
EC3KAFE1: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED 1-ELEMENT MESH  [AC3D20]
*NODE, Nset=ODB_NSET
*NGEN,NSET=LEFT
*NGEN,NSET=RIGHT
*NGEN,NSET=BOT
*NGEN,NSET=TOP
*NGEN, Nset=ODB_NSET
*ELEMENT,TYPE=AC3D20,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
9, , ,-1.E7
**Result mode shapes
*OUTPUT,FIELD,VARIABLE=PRESELECT,FREQUENCY=9999
*OUTPUT,HISTORY
*MODAL OUTPUT,VARIABLE=ALL
*ENDSTEP