Samenvatting

This thesis introduces a cost-effective methodology for estimating tire contact patch forces and moments at wheel centre using axial force measurements from suspension linkages. The primary aim is to reconstruct these dynamic quantities, eliminating reliance on expensive wheel force transducers (WFTs) typically used in vehicle dynamics testing.

A mechanical relationship between the axial forces in suspension members and the resulting at the tire contact patch forces and moments at the wheel centre was first established. Building upon this, a kinematic model was developed to extend applicability to dynamic driving conditions. A MATLAB-based computational framework was then implemented to estimate tire contact patch forces and wheel-centre moments, serving as an intermediate step toward complete contact patch force reconstruction.

To validate the model, finite element analysis (FEA) and static testing were conducted. A prototype measurement system, featuring strain gauge-based load cells and a compact data acquisition unit, was integrated into the MORE trailer for dynamic testing. The system was benchmarked against a reference WFT, showing strong correlation in vertical and longitudinal forces. Discrepancies in lateral forces and moments particularly during transient events were observed and could be attributed to assumptions, compliance, and cross-axle interactions.

Despite these limitations, the prototype system demonstrated reliable operation, low signal noise, and no sensor saturation. These findings support the feasibility of using suspension-based sensing to estimate forces at tire contact patch and moments at the wheel-centre. With further refinement, this approach offers a scalable and practical solution for tire contact patch force estimation in research.