In order the tire industry to fulfill the performance targets set by the automotive tire applications and their conflicts, new methods for the assessment and optimization of the tire behavior are continuously being sought. Due to the structural complexity of the modern tire it is not always easy a physical interpretation of the interaction between variations of the tire localized mechanical properties and the resulting macroscopic performance differences. Thus, robust but simplified criteria based on the involved physical mechanisms are developed and applied. In the present work the interior noise performance of the tire is examined as a function of the viscoelasticity derived energy dissipation mechanism at a virtual level. A modal decomposition method was used as an analysis tool adding as an intermediate physical interpretation step the effect of the construction modifications on the modal characteristics. The application of the so called Modal Strain Energy Method for the simplification of the complex stiffness derived damping matrix by the projection of that to the modal space corresponding to the un-damped system was proposed. It was found that the diagonality assumption is valid for the majority of the strain controlled modes of the tire. Accordingly, the main diagonal terms of the modal damping matrix were used for the derivation of the hysteretic modal damping coefficients. Having assigned the energy dissipation associated with each mode to a single criterion, the tire modes were ranked according to their contribution to the spindle vibration as an indication of their vehicle interior noise impact. Thus, the mode shape spindle displacement component under unsuspended boundary conditions was proposed as a method of identification of the critical for interior noise modes. Performing a simplified virtual test of a tire rolling on a harmonic surface and coupling its spindle degrees of freedom to a stiffness foundation reaction force sensor, the contribution of the above modes to the monitored spindle reaction force was used for the verification of the concept. Having derived simplified but robust criteria both for the assessment of the modal energy dissipation and the identification of the critical modes for the vehicle interior NVH (noise, vibration, and harshness) performance, the method was applied for the analysis of the interior noise performance of three simplified examples of damping distribution across the tire cross section. The ranking of the monitored spindle reaction forces was found in good correlation to the ranking of the hysteretic modal damping coefficients, supporting the validity of the analysis method as a simplified, comparative, tire stand-alone criterion of the interior noise performance during the design development phase of a tire.


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    Titel :

    The assumption of tire damping proportionality and its impact on the simulation of vehicle interior noise


    Beteiligte:


    Erscheinungsdatum :

    2013


    Format / Umfang :

    20 Seiten, 10 Bilder, 9 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Datenträger


    Sprache :

    Englisch




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