Hi Radu and Rainer, Thank you for pushing some changes for me to test, and sorry for the delayed response. The fix (I am using the 8.0.0 release tag) definitely smoothed out noise on one of the plots (longitudinal slip, slip angle, camber_angle), but I was expecting a sinusoidal shape for the slip angle rather than a flat line. The tire force seems to still have about the same degree of noise. See the below plots. [image: f1.png][image: f2.png]
I'll play around with it some more this week and let you know if the results make sense. Also, I encountered an error with the renderer (likely due to me using it in an odd way) and opened a PR: https://github.com/projectchrono/chrono/pull/435 On Monday, December 19, 2022 at 12:30:31 PM UTC-5 Radu Serban wrote: > James, > > Rainer’s fix worked in an indirect way. I pushed some changes that should > address the issue you reported. Please let me know if the results are now > more as you expect them. > > --Radu > > > > *From:* [email protected] <[email protected]> *On > Behalf Of *[email protected] > *Sent:* Friday, 16 December 2022 08:51 > *To:* ProjectChrono <[email protected]> > *Subject:* [chrono] Re: High frequency noise in virtual tire test rig > > > > Hi James, > > > > the HMMWV wheel had inertia parameters, which were too low in this > context. They have been replaced by estimated values based on physics. > > Please pull the last chrono changes and try again. > > > > Best > > > > Rainer > > James Baxter schrieb am Montag, 12. Dezember 2022 um 03:20:55 UTC+1: > > bumping this back to the top since I haven't received any response yet and > am still facing this issue. > > On Monday, November 28, 2022 at 10:25:41 AM UTC-5 James Baxter wrote: > > When plotting the output data from the virtual tire test rig ( > https://api.projectchrono.org/7.0.0/wheeled_rig.html#wheeled_rig_tire), I > observe high frequency noise on the outputs. See the attached plots. > > > > Is this to be expected? Can it be mitigated through different solver > settings? > > > > All solver / timestep settings are unchanged from the demo file showing > how to use the test rig: > > - BARZILAIBORWEIN solver > > - 150 max iterations > > - 4.0 max penetration recovery speed > > - step_size 1e-3 > > - tire_step_size 1e-4 > > > > Thanks, > > James > > > > > > -- > 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/e52e6334-9ec7-4a7b-a093-c6085e66839cn%40googlegroups.com > > <https://groups.google.com/d/msgid/projectchrono/e52e6334-9ec7-4a7b-a093-c6085e66839cn%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/631aaf4a-c661-464d-903a-52f09e853401n%40googlegroups.com.
