The non-linear tire slip behavior, characterized by a friction maximum and its subsequent decline, means that the wheel system is only conditionally stable. Under certain operating conditions, self-excited vibrations might occur. Typical examples of this are longitudinal vibrations of the drivetrain (sometimes also referred to as power hop) and lateral vibrations of the tire during extreme understeer or oversteer. Various measurement and modeling methods have recently been developed to investigate this phenomenon. This presentation provides an overview of these methods and shows how testing procedures and modeling can complement one another and be combined to investigate these self-excited vibrations on a HIL system.

• Tire-road interaction
• Self-excited oscillations
• Simulation
• Testing
• Hardware-in-the-loop (HIL)