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A mass is attached to a linear spring. Period of vibration is determined. Example 17 from Introductory Manual for LS-DYNA Users by James M. Kennedy.

Keywords

*BOUNDARY_SPC_NODE
*CONTROL_TERMINATION
*CONTROL_TIMESTEP
*DATABASE_BINARY_D3PLOT
*DATABASE_HISTORY_NODE
*DATABASE_NODOUT
*ELEMENT_DISCRETE
*ELEMENT_MASS
*END
*KEYWORD
*MAT_SPRING_ELASTIC
*NODE
*PART
*SECTION_DISCRETE
*TITLE

Reduced Input

*KEYWORD
*TITLE
Natural Frequency of a Linear Spring-Mass System
*CONTROL_TERMINATION
  0.150000         0       0.0       0.0       0.0
*CONTROL_TIMESTEP
 1.000e-04 1.000e-04         0       0.0       0.0         0         0         0
       0.0         0         0
*DATABASE_NODOUT
  0.000100
*DATABASE_BINARY_D3PLOT
  0.001000
*DATABASE_HISTORY_NODE
         1
*PART
         1         1         1
*SECTION_DISCRETE
         1         0       0.0       0.0       0.0       0.0
       0.0       0.0
*MAT_SPRING_ELASTIC
         1      5.00
*ELEMENT_DISCRETE
*ELEMENT_MASS
*NODE
*BOUNDARY_SPC_NODE
         2         0         1         1         1         1         1         1
*END

Figures

figure_screw_0ms.png

figure_screw_60ms.png

Animated Result

spring3

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