Hi Radu,
Thank you for your response! It makes sense that collision detection and the additional physical aspects in Chrono complicate the implementation of adaptive step-size control. I’ll be following the future developments regarding implicit time integrators and time adaptivity. I’m also happy to help with testing whenever the updates become available. Thanks again for the explanation and for sharing your plans! Best regards, Stefan Radu Serban schrieb am Samstag, 30. November 2024 um 11:16:11 UTC+1: > Stefan, > > > > This is because a Chrono simulation is possibly more than just multibody > dynamics. The necessary error estimates for step size control would need to > take into account all potential physics. Furthermore, most simulations of > interest involve collision and contact. The collision detection is best > done at constant time steps and that introduces additional constraints on > the integration step size. > > What I did implement in HHT is a simple time adaptivity within the Chrono > step size (controlled by the user and defining the frequency for collision > detection). Granted, that doesn’t work always that great. > > Having said that, we plan on making some (somewhat unrelated) changes to > the implicit time integrators and I will then revisit the time adaptivity > issue as well. > > > > --Radu > > > > > > *From:* [email protected] <[email protected]> *On > Behalf Of *Stefan Oberpeilsteiner > *Sent:* Thursday, September 26, 2024 10:33 PM > *To:* ProjectChrono <[email protected]> > *Subject:* [chrono] Step-size selection in HHT Timestepper > > > > I spent some time studying the HHT time stepping and I am wondering why > the step-size selection published in „On the Use of the HHT Method in the > Context of Index 3 DAE of MBD“ 2005 is not used within Project::Chrono. Is > there any special disadvantage that comes with this step-size selection > method. > > > > Stefan > > -- > You received this message because you are subscribed to the Google Groups > "ProjectChrono" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/projectchrono/80627c22-65f1-479b-812d-efe2f6afc6cdn%40googlegroups.com > > <https://urldefense.com/v3/__https:/groups.google.com/d/msgid/projectchrono/80627c22-65f1-479b-812d-efe2f6afc6cdn*40googlegroups.com?utm_medium=email&utm_source=footer__;JQ!!Mak6IKo!JwbdbYbo1jHgWRtJOUzLJ_yzGCA3mRUPNFJzsb6Aa88DBzgmMZhasbIo8eDMtDbaxojtnf_aKZ3q9QJlU1EbL_we4Q$> > . > -- You received this message because you are subscribed to the Google Groups "ProjectChrono" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/projectchrono/8929fa38-f772-4dc2-acc1-16c0d3917632n%40googlegroups.com.
