The tires have a key role in the dynamics of a vehicle through them we have the vehicle's interaction with the asphalt, and are home to all the main forces exchanged with it. In literature, many physical models have been proposed for them, but for our purpose realtime simulation we have identified these possible candidates:
- model Pacejka
- brush model
- spring model
The first is the most widely used by most current simulations, is an empirical model based on experimental observations of some correlations between the quantities characterizing the behavior of a gomma.E 'based on' approximated curves of some of the tire behavior (such as lateral force / slip angle) by interpolation. The coefficients of interpolating polynomials are obtained by means of "magic formulas" from some physical parameters. The advantage is that at runtime everything is reduced to a simple lookup in a table, because the job of calculating the coefficients can be easily done offline and store the in all pre-calculated tables.
The last two models attempt to explain the physical phenomenon of the adhesion rubber-asphalt and calculate the forces at play. In fact, you must divide the tire sectors (or segments) and apply the formulas to each of them. From the standpoint of use in real-time are much heavier than Pacejka, in fact every frame must calculate all the forces and iterate this calculation for each area. But to simulate some important aspects such as elastic deformation of the shoulder of the tire, the temperature distribution on the tread, etc ...
To explore the question, please read the appropriate topics in the forum and to participate actively adding opinions, technical information etc ...
The last two models attempt to explain the physical phenomenon of the adhesion rubber-asphalt and calculate the forces at play. In fact, you must divide the tire sectors (or segments) and apply the formulas to each of them. From the standpoint of use in real-time are much heavier than Pacejka, in fact every frame must calculate all the forces and iterate this calculation for each area. But to simulate some important aspects such as elastic deformation of the shoulder of the tire, the temperature distribution on the tread, etc ...
To explore the question, please read the appropriate topics in the forum and to participate actively adding opinions, technical information etc ...
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