Hi Thorsten, the MFTire class was a c++ port of the Matlab tool. It contained a lot of features, nearly all proposed bei Hans Pacejka in his book. The original authors know, that many of these features or not used by anybody. They made analyses of the commercial MFTire solutions used e. g. in ADAMS for this and privided a switch to deactivate those features. We decided not to maintain code that nobody ever is going to use, that is the main reason to drop c++-MFTire as tire model in chrono. The c++ port was extremely buggy, that showed a test a test with a validated vehicle model (Fed-Alpha) equipped with validated Pacejka 2002 tire files (donated by Goodyear). Btw. our former Pac02 model worked well with it! We decided to rewrite it yet, to give it a more readable structure and to implement a parser for ADAMS/Car compatible *.tir files. It should be easier to use now.
We definitely don't have all possible functions implemented. Only steady state and combined forces can be used. Inflation pressure dependent data sets can be probably used but have not been tested, because we don't have validated example files for it. So if you have fitted tire parameters for your race car, you should Pac02 in chrono give a try. Best, Rainer [email protected] schrieb am Freitag, 5. Januar 2024 um 23:12:01 UTC+1: > Hi all, > > I am currently trying to simulate a racing car in Project Chrono. As such > the tire simulation is very important to me. I fitted a magic formula v61 > model to my experimental data and while browsing through the pull requests > I found that there is/was a MFTire class for the versions 61 and 62 of the > magic formula in Chrono. Since I didn't find this code in the current main > branch I did a little deep dive and found out that the corresponding class > was deleted in 4f7c0ea8f6b10896459c1867551858706f083632 on the 8th of June > 2023 in the process of reworking the Pacejka2002 tire. I was a little > confused by this since I thought that the MF version 61 and 62 are way > newer than 2002 (imo 2008 atleast). Therefore I wanted to ask whether the > Pac2002 tire contain all the formulas for the current MF versions or what > the process was behind removing this class. > > Sincerely, > Thorsten > -- 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/34f8c9a5-8083-4da5-89e6-52b683f271cdn%40googlegroups.com.
