HJ, First, please keep these conversations on the Chrono user mailing list.
Well, the statement you quoted is pretty clear. It doesn’t say that a wheeled vehicle cannot be used with deformable terrain, but just that certain tire models are not compatible with a deformable terrain. These tire models (Pacejka, TMeasy, Fiala) were developed and meant for rigid terrain; and in fact, pretty smooth rigid terrain at that. Note that we didn’t come up with these tire models, but just implemented them in Chrono. They are standard tire models that are widely used for *on-road* vehicle simulations. As for which Chrono deformable terrain formulation to use, I would not recommend FEA. That is not what we commonly use, it’s a pretty inefficient way of modeling soil deformation, and is quite limiting. I would certainly start with SCM because it’s simpler and fast. If you want something higher-fidelity, I suggest looking at the continuum representation of deformable terrain provided through Chrono::FSI (although that will require an NVIDIA GPU). As I indicated on the tutorial page you linked to, for now you will have to stick with a rigid tire or an FEA tire. Again, for simplicity and efficiency, I recommend using a rigid tire for now. --Radu From: hj <[email protected]> Sent: Friday, 27 January 2023 14:57 To: Radu Serban <[email protected]> Subject: Private message regarding: [chrono] Wheeled vehicle simulation on deformable terrain? Thank you vey much for clarifying Radu. Yes I actually saw the tutorials but the part that confused me was from https://api.projectchrono.org/vehicle_terrain.html that is says : "Note however that these quantities are relevant only for the interaction with the so-called semi-empirical tire models<https://api.projectchrono.org/wheeled_tire.html#vehicle_tire_empirical>. As such, they are not used for the case of deformable terrain (SCM, granular, or FEA-based) which can only work in conjunction with rigid<https://api.projectchrono.org/wheeled_tire.html#wheeled_tire_rigid> or FEA<https://api.projectchrono.org/wheeled_tire.html#wheeled_tire_fea> tire models and with tracked vehicles (as they rely on the underlying Chrono collision and contact system)." So I just wanted t omake sure. I think I'll go with FEA or SCM terrain. Thank you 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/PH0PR06MB82379D1337A5142664B92AB1A7CC9%40PH0PR06MB8237.namprd06.prod.outlook.com.
