Where I can set the friction coefficient for a road defined by crg.* ? I searched the documentation OpenCRG, however there was only a note about the possibility to set it but there in no keyword mentioned.
Here is an excerpt from CRG roads from Adams Online help (under CRG help).
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By default the friction on the CRG road is one: The interaction forces predicted by the tire model are scaled with a factor one. It is possible to define specific road friction scaling factors by supplying Adams Tire a second '.crg formatted file' that contains friction scaling factors (instead of road height values).
This '.crg formatted file' should have the same name as the .crg file with the road height values, but the extension of the file should read .crgf.
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This excerpt from online help means that you need to supply another .crgf file that will have your friction definitions. This means when a <road_name>.crg file is selected for the simulation, the code will look for a second file called <road_name>.crgf. If that exists, it will be opened as well and the friction values will be read from this file.
I am attaching two files here for reference. You can compare them to understand the difference on how the CRGF file defines the friction. Thanks.
Than you for your files. Does this work also for curved road? I tested a curved road but the simulation ends with the following error "Road friction is zero!". I attached the tested files. Is there any format request.
Although the doc of OpenCRG almost didnt introduce the friction setting, but there is demo .m that can guide us to change and create the different friction .
Thank you for the file. Is it possible to do this without MATHLAB? If I understood correctly this operates with Binary files only. It would be easier for me to modify the default scale factor from 1 to some other value as I do not need different friction on different road elements, but it is not clear for me where to find it
just for completeness: the crg documentation ist not 100% correct. The road friction factor (no matter how it is defined) does *not* just scale the tire forces. Rather, it modulates the stiction / sliding friction characteristics between road surface and tread rubber, which in turn might have a *very* nonlinear and dynamic impact on hub forces. This holds at least for all physics-based tire models.
Finally, I was able to run the simulation with friction using *.crg and *.crgf, however the friction modification has no effect on the results, which is very strange .
