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Longitude Tire Force: low-mu to high-mu road

Hi Everyone.

I am a bit stuck.

I am running a straight line ADAMS/Car full vehicle model. The vehicle is travelling on low-mu=0.1 and then enters high-mu=0.9. I am tracking the longitude tire force. While on the low-mu the tires are slipping.

I run two load cases (LC#1 , LC#2). LC#2 is the same as LC#1 except the vehicle enters the high-mu with a higher vehicle speed, higher wheel speed and more tire slip. Roughly same tire normal force.

The results predict that the longitude tire force magnitude is roughly the same between LC#1 and LC#2 shortly after entering the high-mu road. I would expect that LC#2 would have a larger tire longitudinal force since it enters the high-mu road with a higher vehicle speed, higher wheel speed and higher wheel slip.

I also reran using PAC89 and see the same trend.

Would the ADAMS/Tire be able to differentiate these two situations and generate larger longitudinal force if the vehicle hits a high-mu road with greater speed...what am I missing?

joe.

0 jsph_inc over 1 year ago in reply to Jesper Slattengren

Thanks for the help Jesper. After looking into it some more, the wheels have a very large slip from the full throttle on ice. When plotting long tire force vs slip it confirms the long force has saturated at this high slip. Was just counter-intuitive initially when initially seeing the results...but makes more sense to me now.

Thanks again,

joe.
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0 Jesper Slattengren over 1 year ago in reply to jsph_inc

Reminds me of an old friend who, during a winter test session in Northern Sweden, pointed out to a famous European sportscar manufacturer that when they thought they were testing driveline performance on ice by giving full throttle from stand-still, in reality they only tested the tires. 25 Nm would have been enough to break free the tire grip on that surface.
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