Pacejka tire coefficients

[Charlie]

Can anyone tell me what the B13 longitudinal coefficient is used for? I have that many coefficients in the model but I don't see it used in any calculations. Some sample models only go to B12.

email or PM is fine

Thanks

[Charlie]

Can anyone tell me what the B13 longitudinal coefficient is used for? I have that many coefficients in the model but I don't see it used in any calculations. Some sample models only go to B12.

email or PM is fine

Thanks

[ben]

Which Pacejka model? I believe there are different ones. I've got his book so I could check and post back tomorrow.

Ben

[IsheeM]

Pardon my ignorance, but what is a Pacejka model and this B12 and B13 stuff?
Thanks

[Igor]

Pacejka is a former professor from Delft University who created the "magic tire formula". This formula describes the tire model pretty accurately and is used by everyone in the world who is into tires.
His book Tire and Vehicle Dynamics is considered the bible by many.

Igor

[Charlie]

Pacejka 94

thanks

[Buckingham]

Most versions of the "Magic Formula Tyre Model" have a slightly different number of coefficients, and sometimes the meaning of those coefficients can vary from model to model. For example B4 might mean one thing in the '94 model, and another thing in a different model. This also means that the calculations for each model are unique to that model. Make sure you are using the '94 calculations for your '94 coefficients.

Do you have the correct number of coefficients in your data/calculations for your lateral force and aligning torque models?

Donavan Haidinger
University of Wisconsin - Madison

[Charlie]

No I don't, and I think you are correct because my calculations are not working with the formulas I have. I am just working on a longitudinal model right now.

I have ordered Pacejka's book, but it will be at least 2 weeks before it arrives (even with rush shipping!). If anyone has the Pacejka94 formulas I would definitely appreciate it.

I'm not even sure the 94 formulas are in the book, but at least I'll be better informed.

[Charlie]

Thanks for the offers of help. Apparently Pacejka is not even responsible for the Pacejka94 model (or any of them apparently). Here is a disclaimer I found:

<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>The formulae used in the Pacejka '89 and Pacejka '94 tire models are derived from publications by Dr. H.B. Pacejka, and are commonly referred to as the Pacejka method in
the automotive industry. Dr. Pacejka himself is not personally associated with the development of these tire models, nor does he endorse them in any way. <HR></BLOCKQUOTE>

The Pacejka94 formulas can be found in "The Magic Formula Tyre Model. Proceedings of the 1st International Colloquium on Tyre Models for Vehicle Dynamics Analysis, Swets & Zeitlinger B.V., Amsterdam/Lisse, 1993."

[Buckingham]

No, The formulas (which you are looking for) will not be in his book, and yes, you will be better informed for having read it.

Let me know if you end up finding the answer in the colloquium proceedings. After a few hours in the basement of the engineering library I never found the proceedings.

Donavan Haidinger
University of Wisconsin - Madison

[Charlie]

Yeah, You can buy the proceedings here:

http://www.amazon.com/exec/obidos/ASIN/9026513321/qid%3D1089316360/sr%3D11-1/ref%3Dsr%5F11%5F1/104-5718358-0223162

They actually have on in stock!

However, I just plunked down the same amount for his book, so it will have to wait a bit.

[kimmo]

If you have acces to ADAMS you can find the formulas for the pacejka '94 model in the ADAMS/tire guides.

kimmo eggers