Learning Forum

[Mimi Chen]

Hi Erik,

Thanks for your reply.

I understand that the transient structural and the rigid body dynamics use completely different solver, and that transient strcutural can simulate impact, shock loads, etc., while rigid body dynamics cannot. But for my use case, I can use both transient structural and rigid body dynamics right? And the results should be the same using the two? 

I tried to do a simpler simulation of 4-bar-linkage using both transient structural and rigid body dynamics, shown in the screenshot below for results comparison:

As shown in the comparison, I used the same settings for everything, but the results using two different solvers are completely different: Max stress 151.99 Pa for rigid body dynamics and 15693 Pa for transient structural, I don't understand why this happens? Do you have a clue?

Moreover, coming back to the topic of my original question, I checked the submodeling video, and find it not so relevant to what I asked about. As I understood, submodeling is something like running a "coarse" parent analysis first on a large assembly, then run a "finer" analysis in a specific part. However, what I wanted to ask is to solve step 1: sit to stand, then use the result from step 1 directly to solve step 2, so whenever I want to change a parameter in step 2, I don't have to re-run step 1 again. These two steps are basically using the same mesh and not a finer mesh, just two differen actions. I hope this explanation is clearer. Is this possible?

Thank you and best regards,

Mimi