Hello Radu Awesome. That completely makes sense. I will defnitely check out those books for parameters and going more into theory of it. Thank you!
On Friday, March 3, 2023 at 5:33:59 AM UTC-4 Radu Serban wrote: > HJ, > > > > Keep in mind that SCM is just a framework that generalizes the > semi-empirical Bekker theory to arbitrary terrain topography and impactor > geometry. As such, in terms of modeling a particular type of soil, you > will need to look for appropriate parameter values which typically come > from bevameter experiments. Look for example in the book by Wong, or any > other source for such parameters. > > > > The FEA deformable soil model in Chrono::Vehicle is not really maintained > (it builds and should work, but we have not used it for any relevant > simulations). That modeling approach is computationally quite expensive, > relies on parameters that are difficult to come by, and (unlike granular > dynamics or the CRM approach that Dan mentioned) cannot capture larger soil > deformations. If you are interested in an FEA-based approach, look also at > work by Yamashita and Sugyiama on hybrid FEA-DEM formulation (by the way, > their terramechanics code can be coupled to Chrono vehicle simulations > through the Chrono::Vehicle co-simulation framework). > > > > But I second Dan’s suggestion to look at the deformable soil formulations > available in Chrono, in the order SCM, CRM, DEM. > > > > --Radu > > > > *From:* [email protected] <[email protected]> *On > Behalf Of *hj > *Sent:* Thursday, 2 March 2023 16:44 > *To:* ProjectChrono <[email protected]> > *Subject:* Re: [chrono] Wheeled vehicle simulation on deformable terrain? > > > > Hello Dan > > > > Thank you very much for your comprehensive reply and sending the papers. > The papes are very interesting works. I will definitely go with the > order that you mentioned for using different methods. I just have a couple > of follow up question. > > > > What do you mean by " we don't have FEA model for terrain" ? what is the > main limitation of FEADeformableterrain class ? And is there any paper you > guys published for the mud modeling using SCM that I can have a look? > > > > Thank you and Regards > > On Wednesday, March 1, 2023 at 8:24:15 PM UTC-4 Dan Negrut wrote: > > Hi hj, > > You want to use SCM as much as possible. We used it in the past for mud > and almost rigid terrain (small sinkage). It’s pretty much an empirical > approach. In general, SCM can run at Real Time Factor close to 1 (that is, > real time). > > We do not have a FEA model – the Chrono continuum terrain model is solved > with SPH and it’s called Continuous Representation Model (CRM). CRM is your > next fastest choice, RTF is anywhere from 50 to 200. > > If you go to DEM, the RTF probably is going to reach into 1000. > > So, if you want to generate training data and need to get tons of data, > try, in this order, SCM, CRM, DEM. > > See here > <https://asmedigitalcollection.asme.org/computationalnonlinear/article-abstract/doi/10.1115/1.4056851/1156640/Real-time-Simulation-of-Ground-Vehicles-On?redirectedFrom=fulltext>, > > and here > <https://www.authorea.com/doi/full/10.22541/au.167355891.12085319/v1>, > for recent papers on this topic. For DEM, we’ll have a paper out soon, but > for an older version, see here <https://www.mdpi.com/2227-9717/9/10/1813>. > > Good luck. > > Dan > > --------------------------------------------- > > Bernard A. and Frances M. Weideman Professor > > NVIDIA CUDA Fellow > > Department of Mechanical Engineering > > Department of Computer Science > > University of Wisconsin - Madison > > 4150ME, 1513 University Avenue > > Madison, WI 53706-1572 > > 608 772 0914 <(608)%20772-0914> > > http://sbel.wisc.edu/ > > http://projectchrono.org/ > > --------------------------------------------- > > > > *From:* [email protected] <[email protected]> *On > Behalf Of *hj > *Sent:* Wednesday, March 1, 2023 2:52 PM > *To:* ProjectChrono <[email protected]> > *Subject:* Re: [chrono] Wheeled vehicle simulation on deformable terrain? > > > > Hi > > > > I had a question about using deformable terrain in Chrono. Maybe it's not > chrono-specific but I aappreciate if I can have a feedback. I have a few > research goals that I'd like to use Chrono for. Right now my work is to get > data from tire (for now just tire and then the vehicle ) on deformable > terrain to train RL or ML models. I started with SCM and rigid tire and my > goal is to have data from different "types" of terrain such as soft and > hard soil, snow, gravel, mud , etc. My question is for what type of terrain > you think SCM would work the best to have the model close to real life? And > for what type of terrain, I "have to" use DEM and granular terrain modeling > methods? And for what type of terrian you think it's better to use FEA > terrain? I appologize if my question is too long but I appreciate any > feedback! > > > > Regards > > > > On Thursday, January 26, 2023 at 3:12:45 PM UTC-4 Radu Serban wrote: > > Yes, of course you can use wheeled vehicles on deformable terrain. > > There are demos in the Chrono distributions that illustrate that. Which > particular deformable terrain formulation are you interested in? > > Finally, would you please let us know where in the tutorials is mentioned > that only tracked vehicles work with deformable terrain?! > > > > --Radu > > > > *From:* [email protected] <[email protected]> *On > Behalf Of *hj > *Sent:* Thursday, 26 January 2023 19:43 > *To:* ProjectChrono <[email protected]> > *Subject:* [chrono] Wheeled vehicle simulation on deformable terrain? > > > > Hello > > > > I've been reading the chrono tutorial about deformable surface modeling. I > was wondering if there is any way I can use Chrono for simulation of > wheeled vehicle on a deformable terrain? It is mentioned in the tutorials > that deformable terrain models only work with tracked vehicles! > > > > > > I appreciate any feedback ! > > > > Thank you > > -- > 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/67c948f8-4d62-43cb-8b2d-bf4e59d0347fn%40googlegroups.com > > <https://groups.google.com/d/msgid/projectchrono/67c948f8-4d62-43cb-8b2d-bf4e59d0347fn%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > -- > 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/48ed9365-641b-4a3a-918d-7e54721ae2can%40googlegroups.com > > <https://groups.google.com/d/msgid/projectchrono/48ed9365-641b-4a3a-918d-7e54721ae2can%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > -- > 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/00d9de13-79a5-4001-9943-e14c234f28d0n%40googlegroups.com > > <https://groups.google.com/d/msgid/projectchrono/00d9de13-79a5-4001-9943-e14c234f28d0n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "ProjectChrono" group. 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