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# A question about longitudinal tire slip ratio

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## A question about longitudinal tire slip ratio

(OP)

The traction force is generated between the tire and road, it has relation with slip ratio, simply,  F=Cs, s is slip ratio, which is defined as as a difference between the tire tangential speed and the speed of the axle relative to the road. Question here is how we can find these two velocity in the same time.
Replies continue below

### RE: A question about longitudinal tire slip ratio

Use a correvit to measure true road speed and a tone wheel on the axle to find the axle speed and a laser height probe to measure the true rolling radius

Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

### RE: A question about longitudinal tire slip ratio

(OP)
Thank GregLocock for your quick reply.  But how can some vehicle dynamic software, such as Adams-car and car-sim , determine the longitudinal tire slip ratio.

### RE: A question about longitudinal tire slip ratio

If you know the longitudinal force at the CP, and the vertical force, then you have a look up chart based on the tyre characteristics which tells you the slip ratio. That chart is compiled more or less as I explained above, with the addition of some load-measuring systems.

Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

### RE: A question about longitudinal tire slip ratio

Ordinally the slip is computed by tire forward speed Vx, the angular speed revolution rou. And effective rolling radius re.
Slipratio=(Vx-re*rou)/Vx
you can get Vx,re and rou from the Software before you use your tire model.
the tire model just tells the relationship between longitudinal force and slip ratio.

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