Learning Forum

[S1d996]

Im doing a 3d simulation of a rod which involves 6DOF udf file in which the mass, external force and moment of inertia are involved.

Im applying the external force in the upward direction i.e; +ve Y Direction and gravitational acceleration in the downward direction i.e; -ve Y Direction. The outcome of the simulation is that the rod is moving downwards. The crossed checked the Applied External Force in +Y direction which is equal to  1g force

UDF FILE USED FOR SIMULATION:

DEFINE_SDOF_PROPERTIES(rod, prop, dt, time, dtime)

{

   prop[SDOF_MASS]       = 3.504 ;

   prop[SDOF_IXX]        = 2.110618;

   prop[SDOF_IYY]        = 1208.578814;

   prop[SDOF_IZZ]        = 1208.786357;

   prop[SDOF_IXY]        = 0.00085;

   prop[SDOF_IXZ]        = 0.000124156;

   prop[SDOF_IYZ]        = -0.000024;

     if(time = 0 && time < 1.0)

       {

         prop[SDOF_LOAD_F_Y] += 34.37424;

         prop[SDOF_LOAD_M_X] += 0.00000;

prop[SDOF_LOAD_M_Y] += 0.00000;

prop[SDOF_LOAD_M_Z] += 0.00000;

 

   }

      

   printf ("nrod: updated 6DOF properties");

}

and later I increased the Force to 2g and still the rod is moving downwards.

Can anyone help with the problem?

Thanks in advance

SID