Hi Stefan, the Pacejka tire model in chrono is just outdated. While it is nearly feature complete, it lacks stability. Another problem is the data input routines. It pretends to read tiem orbit files (Adams/Car), but expects the data entries to be in a certain order. It is very likely that nonsense input is read from a valid Adams/Car tire file, as long as you don't reorder the data lines, I guess nobody is eager to do that.
If you want to use a Pacejka tire model in chrono, use Pac02. Pac02 hasn't all features possible, but it works and doesn't crash chrono vehicle simulations. For a benchmark project we needed a Pacejka89 (Adams/Car) model. This model has a very clear implementation structure, this structure was the also taken for Pac02. The slip definitons differ of course, as do the formulae. Pac02 and Pac89 are comparable in simulation accuracy. Pac02 can be easily rescaled to different tire load levels due to its skaling factors, so it is more flexible to use. stefan schrieb am Dienstag, 16. August 2022 um 10:43:57 UTC+2: > Hello, > > The pacjka tire models expressed in the manual > <https://api.projectchrono.org/wheeled_tire.html> are Pac89 and Pac02, > But I found pacjak tire model in HMMWV vehicle, and the simulation results > derived from Pac02 and Pacjka model are obviously different, I don't know > which model is better for vehicle simulation and which derived simulation > result is closer to the real one. Otherwise, could you tell me the > difference between Pacjka model and Pac02 model from the implementation > principle. > -- 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/9a7ad29e-7185-4488-8979-752f5513c133n%40googlegroups.com.
