Learning Forum

[Audy Maulizar]

For my research, I will have to do a transient dynamic analysis on a structure that is loaded with a load with a magnitude that changes with the structural displacement and velocity at each time step. So for example the load function is Fy(t) = 1000*y*sin(100*vy), where y is the displacement in the y direction and vy is the velocity in the y direction. I plan to assign the loads as nodal forces so that ANSYS would extract the value of y and vy at those nodes at a time step to be used to calculate Fy(t) at the next time step. I wonder if it was possible to do from the GUI or do I have to write an APDL script for that? 

[Dennis Chen]

you will need APDL code.     This kind of stuff is much better suited in LS-Dyna in my opinion as you can write your own functions to define loads that's in a language similar to C or Fortran (uses some of the similar mathematical expressions).   An example is below.   

I take every chance to advocate for LS-Dyna :D

*BOUNDARY_PRESCRIBED_MOTION_SET
$# nsid dof vad lcid sf
 1 1 0 1
 1 3 0 2
*DEFINE_FUNCTION
1,x-velo
x(t)=1000*sin(100*t)
*DEFINE_FUNCTION
2,z-velo
a(t)=x(t)+200 

[Audy Maulizar]

Is it possible to do this in ANSYS Mechanical? I already created the model in Mechanical and if possible I'd like to use the existing model.