Numerical and Experimental Modal Analysis of a Pneumatic Kart Tyre
ISAAC
Type de document
RAPPORT DE STAGE
Langue
anglais
Auteur
ISAAC
Résumé / Abstract
Tyre/road noise is a major source of pollution for light vehicle at speed of above 50km/h. To understand the nature of this noise and proffer solutions to the response of tyres when excited by a force, it is imperative to understand the modal response of the tyre. This modal response includes the natural frequencies, damping ratios and modal shapes. To achieve these, a kart tyre is adopted because of its simplified material constituents and its future integration on a test bed for tyre/road contact at the Environmental Acoustic Laboratory of Ifsttar. Modal parameters were obtained by both numerical and experimental methods. A finite element tool Abaqus 6.12.1 was used to obtain results for the numerical modal analysis. Three kinds of materials properties were modeled for the tread which are elastic, viscoelastic and hyperelastic properties in the case of small deformations. Modal shapes, natural frequencies and frequency response functions were obtained while the damping ratios were calculated. Simultaneously, the modal analysis of a slick kart tyre was performed
experimentally by the test bed. Frequency response functions were extracted, damping ratios were analytically obtained and the modal shapes were obtained from another experimental project. The predicted numerical solutions were compared with the experimental results and it was concluded that the experimental results validated the numerical solutions. Comparison of the viscoelastic model gives a very good agreement with the experiment when measured at the excitation point while the elastic model almost reproduces the same results of the experiment when measured at a transfer point.
