Markovian arrival process

Hans Bastiaan Pacejka (Rotterdam, 1934) is an expert in vehicle system dynamics and particularly in tire dynamics, fields in which his works are now standard references. He is Professor emeritus at Delft University of Technology in Delft, Netherlands.

The Pacejka "Magic Formula" tire models

Magic Formula Curve

Pacejka has developed a series of tire design models over the last 20 years. They were named the 'magic formula' because there is no particular physical basis for the structure of the equations chosen, but they fit a wide variety of tire constructions and operating conditions. Each tire is characterized by 10-20 coefficients for each important force that it can produce at the contact patch, typically lateral and longitudinal force, and self-aligning torque, as a best fit between experimental data and the model. These coefficients are then used to generate equations showing how much force is generated for a given vertical load on the tire, camber angle and slip angle.

The Pacejka tire models are widely used in professional vehicle dynamics simulations, and racing car games, as they are reasonably accurate, easy to program, and solve quickly. A problem with Pacejka's model is that when implemented into computer code, it doesn't work for low speeds (from around the pit-entry speed), because a velocity term in the denominator makes the formula diverge. An alternative to Pacejka tire models are brush tire models, which can be analytically derived, although empirical curve fitting is still required for good correlation, and they tend to be less accurate than the MF models.

The general form of the magic formula is: $R(k)=d\cdot sin\{c\cdot arctan[b(1-e)k+e\cdot arctan(bk)]\}$ where b, c, d and e represent fitting constants and R is a force or moment resulting from a slip parameter k.

See also

• Important publications in vehicle dynamics
• Bicycle and motorcycle dynamics

Bibliography

• Pacejka, H. B., The wheel shimmy phenomenom: A theoretical and experimental investigation with particular reference to the nonlinear problem (Analysis of shimmy in pneumatic tires due to lateral flexibility for stationary and nonstationary conditions), Ph.D. Thesis, Delft University of Technology, Delft, 1966.
• Bakker, E. ; Nyborg, L. ; Hans B. Pacejka Tyre modelling for use in vehicle dynamics studies 1987 Jan. Society of Automotive Engineers, Warrendale, PA.
• PWA Zegelaar, HB Pacejka The in-plane dynamics of tires on uneven roads Vehicle System Dynamics, 1996 - ocp.tudelft.nl
• Pacejka, H. B. Tire and Vehicle Dynamics, Butterworth-Heinemann, Oxford, 2002.

References

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.

External links

• Pacejka's works

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