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Road vehicle modeled with Magic Formula


Introduction

The behaviour of the creep forces between a air-filled rubber tire and ground is more complex than the creep forces between wheel and rail. The behaviour of a rubber tire is different than a steel tire. A road vehicle can steer freely, it doesn't need to follow a certain track. A wheel made of steel is very stiff in all directions. In an air-filled rubber tire, the flexibility in the rubber walls must be taken into account.
However, the properties of a rubber tire can measured in a test rig, and the data can be used as input data to the Magic Formula tire models


Download the example


Input data model

The model describes a car standing in 4 wheels. The two leading wheels steers in a sinusoidal motion. The frequency of the steering wheels motions is varied from 0.05[Hz] up to 2.0[Hz].


Input data files

All cases can be run with script ./RunAll.bat.

Animate the simulations in program Glplot.


Results


The steering wheel moves in a sinusoidal motion of 0.10[Hz]:


As can be seen in the video above, the vehicle follows the steering motion of the front wheels.



The steering wheel moves in a sinusoidal motion of 2.00[Hz]:


In this video the steering motion is too fast. The vehicle is not able to follow the steering motion of the wheels.