Ji Li, A step size of 20 ms is too large for stable vehicle dynamics simulation.
I just tried your code with my setup, and I get an RTF of around 0.7. It looks like you are using a relative recent version of the code in the main development branch, so I can only assume this has something to do with your platform. You are using quite old versions of Ubuntu and GCC. Can you upgrade and see if that helps? --Radu From: [email protected] <[email protected]> On Behalf Of ji li Sent: Friday, 28 October 2022 07:21 To: ProjectChrono <[email protected]> Subject: Re: [chrono] Speed up simulation update times Hello Radu and Dan: Thank you for your reply。 The information for these questions is as follows: my configuration： ubuntu 16.04, CPU i7-9700k, gcc --version: 5.5.0 , vscode 2022， use default solver, I both run the code On Release and Debug. The problems I run the demo_VEH_Sedan.cpp( removed visualization code) are follows: 1. the step size I set 2ms, while The my_sedan advance spend 100.29ms on Release and Debug. 2. When I changed the step size to 20ms, the speed increased to nan rapidly and the system crashed in a short time. [cid:[email protected]] The modified demo_VEH_Sendan.cpp is shown in the attached file. 在2022年10月28日星期五 UTC+8 07:52:39<Dan Negrut> 写道： Do you mean “Sedan”? Also, for that RTF, can you share the value of the integration time step, who built the solver, what hardware it was run on. If you mean Sedan, Chrono can run that relatively easily in real time, see for instance here: https://uwmadison.box.com/s/39107d2577slfg2c54j6xeu5z5va0zes. 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<tel:(608)%20772-0914> http://sbel.wisc.edu/ http://projectchrono.org/ ------------------------------------------------- From: [email protected] <[email protected]> On Behalf Of ji li Sent: Thursday, October 27, 2022 11:01 AM To: [email protected] Subject: [chrono] Speed up simulation update times Hello， Recently, when I was doing a Dedan simulation, I found that the value of RTF was too large, about 50.23 . I want to know that how to speed up the time of advance. In addition, I would like to know if this simulation step size can be modified？ If the step size is 0.02 s, the system will crash. -- 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/CAGrNw3cdf8siD8b8nf0m%2BEAdhfzwGfWXRfuAytaoV0m8-W813Q%40mail.gmail.com<https://groups.google.com/d/msgid/projectchrono/CAGrNw3cdf8siD8b8nf0m%2BEAdhfzwGfWXRfuAytaoV0m8-W813Q%40mail.gmail.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]<mailto:[email protected]>. To view this discussion on the web visit https://groups.google.com/d/msgid/projectchrono/22bf1182-40cd-4fc8-b591-347e1df36730n%40googlegroups.com<https://groups.google.com/d/msgid/projectchrono/22bf1182-40cd-4fc8-b591-347e1df36730n%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/PH0PR06MB82373A1C5492FB377C050E66A7329%40PH0PR06MB8237.namprd06.prod.outlook.com.
