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Measurement of geometric outputs and verification of mathematical models  

The TRITOP optical system can be used also for verification of mathematical models created e.g. by multi-body programs. This is done by comparing outputs of such models with the same outputs measured on the real object (car). In case of verification of suspension models, key parameters (model outputs) that have to be used to compare with measurements are:

  • Toe-in and toe-out
  • Wheel camber
  • Kingpin inclination, caster angle
  • Ackerman steering geometry
  • Axles symmetry

If these values are calculated for static (driving) position of the car’s body and the wheel, then we refer to this as suspension geometry. If we also calculate changes of these parameters in dependence on relative wheel displacement against the car’s body, or in dependence on steering angle, we analyze kinematic characteristics.

Measurements of kinematic characteristics of suspension and geometry of wheels by TRITOP are done as follows. Coded points of the TRITOP system are placed on the wheel rim. Other points are placed on the car’s chassis or body. Multiple measurements are done that make it possible to determine the plane and center of the wheel (unit vector of the wheel is used here). In this way, suspension geometry can be obtained, as well as kinematic characteristics – when measurements are done in several height levels of the car’s body and various steering angles.

This procedure may be used only for verification of the model, but also for the analyses of suspension kinematic characteristics of the wheel without the use of the model.

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