*HEADING
 FREE VIBRATION OF SPRING-DASHPOT-MASS SYSTEM  
*NODE,NSET=FILE
 1,10.
*ELEMENT,TYPE=DASHPOT1,ELSET=D
1,1
*DASHPOT,ELSET=D
 1, 
0.12, 
*ELEMENT,TYPE=SPRING1,ELSET=S
2,1
*SPRING,ELSET=S
 1, 
 30., 
*ELEMENT,TYPE=MASS,ELSET=M
3,1
*MASS  ,ELSET=M
0.02588, 
*STEP
  STRETCH OUT
*STATIC
1.E10,1.E10
*BOUNDARY
 1,1,1,1.
 1,2,3
*ENERGY PRINT,FREQUENCY=2
*EL PRINT,FREQUENCY=2,SUMMARY=NO
S , E
*NODE PRINT,FREQUENCY=2,SUMMARY=NO
U1 , V1 , A1 , CF1 , RF1
*ENERGY FILE,FREQUENCY=10
*NODE FILE,NSET=FILE
U , V , A
*END STEP
*STEP,INC=200
  RELEASE INITIALLY STRETCHED SYSTEM
*DYNAMIC,HAFTOL=10.
 5.E-4,.7
*BOUNDARY,OP=NEW
 1,2,3
*END STEP