How to properly trace a python script working in a transient analysis or not?

- January 9, 2022 at 3:16 pm
  
  Baloch
  Subscriber
  
  Dear All,
  I am using a python script to control longitudinal spring in transient analysis. How I can make it sure whether the script is working or not? Because when I run the problem and looking into solver output there is no information in the solver out put about the script.
- January 10, 2022 at 7:49 am
  
  ErKo
  Ansys Employee
  
  Hi
  
  I would try to run a simple test case (as shown below), where you use this script, and thus expect a certain behaviour.
  
  So say the spring changes stiffness halfway through the analysis (say from 1 N/mm to 2 N/mm at time 9.5 sec.) then in the spring probe for the spring which is just attached to a block which is being pulled by a constant displacement (1 mm), we should see the force in the spring doubling from 1 N to 2 N, just as shown below so that is a simple example on how to see that the script (apdl to have time dependent stiffness) works.
  Of course one can create many different type of tests so this is just a simple one for reference, and in order to explain how one can check if a script does what it is supposed to do.
  
  All the best
  
  Erik
- January 12, 2022 at 1:51 pm
  
  Baloch
  Subscriber
  
  Dear
  If possible can you share a snap of the apdl script you used?
- January 12, 2022 at 2:57 pm
  
  ErKo
  Ansys Employee
  
  Hi
  
  See this post where the snippet is shown - the only difference here is tha the *dim array kfreq should be a function of time not frequency,
  so the array is ktime called say and defined as:
  *DIM,ktime,table,5,1,,TIME
  RMODIF,_sid,1,%ktime%
  
  Of course you need to assign the appropriate values to ktime just as is done in that post for kfreq - of course you need your own time and stiffness values, this is just for reference.
  For more info see the *DIM, and RMODIF commands.
  
  All the best
  
  Erik