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Ansys Learning Forum › Forums › Discuss Simulation › LS Dyna › Application of base acceleration to a spring-mass system › Reply To: Application of base acceleration to a spring-mass system

April 11, 2023 at 6:14 pm
Tonmoy
Subscriber

 

Thank you for your reply Dr. Koutras. I will work to fix the implicit then.

I have two more questions about the problem:

 

  • the analysis did not “perfectly” overlapped even using 1/20*T. Should I also consider that as “okay”?

 

 

  • When should I use the keyword deck *BOUNDARY_PRESCRIBED_MOTION rather than *LOAD_BODY_X? As in my small experience, I have seen that using the former deck (setting VAD=1) the whole system moves away from the initial coordinates, so I get a response which increases as the time increases.
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