Modèle de contact dynamique pneumatique chaussée par approche multi-aspérités : application au bruit de roulement

Guillaume Dubois 1
1 EASE/Acoustique
IFSTTAR/IM - Département Infrastructures et Mobilité
Abstract : The tyre/road noise plays a significant role in the road traffic noise pollution. It is generated by complex mechanisms influenced by several parameters such as the road texture, the contact geometry and the tyre characteristics. The present work deals with the numerical study of tyre/road contact for rolling noise prediction and focuses on the road texture influence. The contact problem is solved using a Two-scale Iterative Method (TIM) based on a multi-asperity approach of the road surfaces. The tyre is modelled by a viscoelastic half-space and characterised by standard rheologic models (Zener or generalised Maxwell). In order to use the TIM for tyre/road contact, a partitioning method of the road surface is developed, allowing a global description based on contact laws on each asperity. In comparison with classical methods, the TIM gives the same results but it is less time-consuming. Thus it allows to study the contact problem for a large zone. The introduction of the viscoelasticity of the tyre causes a decrease of the contact area independent of the vehicle speed, in agreement with experimental results. The introduction of tyre vibration in the contact model influences the apparent contact area and the contact forces level, but the results highlight the need for an experimental validation of the dynamic effects on tyre/road contact. Finally, the contact parameters allow to quickly obtain a rough estimation of the low-frequency noise (315-1000 Hz). The contact forces obtained using the elastic TIM are strongly correlated with the low-frequency noise until 1000 Hz for two tyre configurations (slick and standard patterned). Thus a statistical hybrid method is developed in order to estimate the tyre/road noise at low-frequency, giving encouraging results.
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Guillaume Dubois. Modèle de contact dynamique pneumatique chaussée par approche multi-aspérités : application au bruit de roulement. Acoustique [physics.class-ph]. Ecole Centrale de Nantes (ECN), 2012. Français. ⟨tel-00755561⟩

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