Die Magic Formula und das SWIFT Reifenmodell sind bekannte semi-empirische Reifenmodelle für fahrdynamische Simulationen. Bisher ist die Identifizierung aller Modelparameter für jeden Luftdruck die einzige Möglichkeit um Luftdruckveränderungen zu berücksichtigen. Da das eine zeitraubende und demzufolge teure Aktivität ist, sind TNO und die TU Eindhoven eine Studie gestartet um die Magic Formula und das SWIFT Reifenmodell zu erweitern, damit Luftdruckveränderungen berücksichtigt werden können. Dieser Beitrag geht ein auf den Einfluss von Luftdruckveränderungen auf die quasistatischen Kraftübertragungseigenschaften und auf die quasistatischen Eigenschaften des Reifens auf kurze Fahrbahnunebenheiten.
The Magic Formula and SWIFT tyre models are well-known tyre models that are widely used in vehicle dynamic simulations. Both the Magic Formula and the SWIFT tyre model are semi-empirical tyre models, which means that for parameter identification several tyre measurements have to be carried out. Up to now, the only way to account for inflation pressure changes is to identify all model parameters for each inflation pressure that has to be considered. Research at TNO and Eindhoven University of Technology was started to extend the Magic Formula and SWIFT tyre model so that tyre inflation pressure changes can be accounted for. This paper describes the research that was conducted to extend the Magic Formula expressions for inflation pressure changes. Furthermore, it focuses on the influence of inflation pressure changes on the enveloping properties of the tyre. To obtain insight in which Magic Formula characteristics should be extended to include the influences of inflation pressure changes, both a physical brush tyre model and measurement results from the TNO Tyre Test Trailer have been used. For investigating the influence of tyre pressure changes on the enveloping properties of a tyre, experiments were carried out at the Flat Plank test facility of Eindhoven University of Technology. With the proposed Magic Formula extensions it is possible to simulate the effect of inflation pressure changes in a limited range of typically 1 bar. Besides the benefit that the tyre force and moment characteristics at different inflation pressures can be obtained with only nine additional parameters, instead of the about 100 Magic Formula parameters that are required for each new Magic Formula fit, it is also possible to obtain the force and moment characteristics for inflation pressures that are not measured via interpolation. This last aspect is considered important for vehicle handling optimisation.
Extending the Magic Formular and SWIFT tyre models for inflation pressure change
Erweiterung von Magic Formula und SWIFT-Reifenmodell für Luftdruckveränderungen
2005
25 Seiten, 20 Bilder, 2 Tabellen, 17 Quellen
Conference paper
English
Extending the Magic Formula and SWIFT tyre models for inflation pressure changes
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