The road noise performance is the consequence of strong interactions between the tires and the vehicle. In the scope of a vehicle project, the car maker and the tire manufacturer want to early identify the best tire for the vehicle. But evaluating the tire solutions without having the physical vehicle is a strong challenge, especially in the scope of reducing costs and delay in development steps. Some recent works show that the tire parameters which influence the structure borne road noise are mainly the FZ force and the MX torque at the wheel center. This paper deals with a criterion able to rank tire solutions in interior noise in the [80-400 Hz] frequency band, that takes into account the tire rolling on a rough surface. The inputs are the FZ force and the MX torque generated by the ground/tire interaction and transmitted to the wheel center. Even if this new criterion can be used with measured data, the narrow frequency band of tire test rigs is often a barrier. In order to breakdown that limit, a numerical sub structured tire + wheel + cavity model was developed by Michelin taking into account the rolling effects. This numerical model combined with a simple ground excitation model generates the FZ force and the MX torque at the wheel center which will then be used as inputs for the structure borne road noise criterion. This numerical approach is a step forward to control the interior noise spectrum at the early stage of a vehicle project. Nevertheless, some new technical challenges already appear, that will need to be further discussed: comprehension of the ground excitation in the contact patch and technologies to obtain some accurate experimental forces and torques at wheel center.
Tire-alone criterion for structure borne road noise performance
Reifenabhängige Kriterien für den Körperschall der Fahrbahn
2012
13 Seiten, 10 Bilder, 2 Tabellen, 9 Quellen
Aufsatz (Konferenz)
Englisch
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