How much do the slip angle differ from the toe angle in a Truck?

[ysh23]

Say a truck has 0.1 degree of Toe, driving at 80 km/hr in a straight line.

Would it be safe to assume that the Slip is 0.1 degree? I used vehicle dynamics theory Kiencke and personally do not think it is the case see attached image.

Curious about your ideas.

Thank you,
Yosef

http://files.engineering.com/getfil...45-aee5-bd1f7d652992&file=questions_forum.bmp

 

[ysh23]

Direct link to the attachment

http://i.imgur.com/8ffZF.png

 

[GregLocock]

Yes in a straight line on a flat road with no steer te slip angle =toe angle. Your picture explains nothing to me.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?

 

[ysh23]

Hey Greg,

Thanks a lot for the reply, appreciate it. I have added an explanation and 3 hypothesis for more clarity.

The picture on the right is supposed to show a truck with two different toe angles δ. The pictures to the right show the slip angle α and toe angle δ zoomed in on the upper left wheel.

Hypothesis:
In reality when the two toe angles are different, the resultant speed vector of the whole vehicle is not straight and as a result the toe and slip is not equal.

Hypothesis 2:
When simulating, it is ok to consider slip = toe angle since in reality the difference between the two angles are very small.

Hypothesis 3:
Slip and toe angle in straight driving are between 0.08 and 0.2 degrees.

Regards,
Yosef