Soutenance de thèse : Bharath ANANTHARAMAIAH

Modelling of tyre noise for unpleasantness evaluation

Doctorant : Bharath ANANTHARAMAIAH

Laboratoire INSA : LVA

Ecole doctorale : ED162 Mécanique, Énergétique, Génie civil, Acoustique

The main aim of the current work is to explore the factors that influence the noise generated by tyres, especially its unpleasantness, in order to enhance the perception of a car noise at low speeds. The major outcome of this work is to develop a simulation or finite element (FE) tool that allows the prediction of generated tyre noise and perception of its unpleasantness. This creates a pathway to leverage tyre noise for the enhancement of pedestrian safety, especially from a vehicle passing by at relatively low speeds. The tyre FE model development process presented in this work includes tyre rubber and plies material characterisation. These properties are used in simulations to model tyre static and dynamic behaviour. From these simulations the noise transfer functions (NTFs), and thus impulse responses (IRs), due to impact on treads at tyre-road contact patch, are determined. Rolling forces on each tread of a rolling tyre are determined and convolved with corresponding impulse responses. Further, these are concatenated to develop tyre rolling noise for various tyre inflation pressures and rolling speeds. The power spectral densities of generated noise/audio files are correlated with that of tests. Finally, both test and simulated rolling audio files are subjected to listening tests to grade their unpleasantness. Results confirmed good reliability and sensitivity in the FE tool  developed in this work for the change in unpleasantness in the noise due to variations in the tyre speeds. However, the same stood inconclusive for various inflation pressures of the tyre.