**  Pendul dimension mm, gram, second
*Node
*Element, Type=C3D8, Elset=Pendul
*Nset, Nset=PendulBack
*Nset, Nset=Origon
*Material, Name=Steel
*Density
7800E-06
*Elastic
210000, 0.3
*Solid section, Elset=Pendul, Material=Steel
**   ---  Using a stiff spring as connecting rod
*Element, Type=springa, Elset=Espring
*Spring, Elset=Espring
10.E+06
**   ---   Lock the Penduls mass moment of initia
**   ---   + movement in Z-plane
**node,dir,fact,node,dir,fact ......... = 0
*Equation
** Lock the pendul arm at the center of pendul
**
*Step, Nlgeom, Inc=11000
*Dynamic, Explicit
0.01, 0.5, 1E-04, 0.005
**
*Boundary, op=New
Origon, 1, 3, 0.
PendulBack, 3, 3, 0.
**
*Dload, op=New
Pendul, Grav, 9820, 0, -1, 0
**
*Node file
RF, U, V
*El file
S, E, ENER
*End step