P. Kindt, Structure-Borne Tyre/Road Noise Due to Road Surface Discontinuities, 2009

Abstract

The passengers of a vehicle that is crossing a road surface discontinuity, such as a joint in a concrete road surface, railroad crossing, cobbled road, etc., are subjected to transient vibrations and noise. The amplitude and frequency content of the vibrations and noise inside the vehicle have a strong influence on the perceived comfort and quality of the vehicle. In addition, while crossing a road discontinuity, the noise exterior to the vehicle reaches a significant peak level which causes annoyance to exterior observers. The main objective of this dissertation is to obtain a thorough understanding of the structure-borne tyre/road noise generation due to a discontinuity in the road surface. To achieve this goal, rolling tyre vibrations, noise radiation and dynamic spindle forces are experimentally analyzed on an innovative laboratory test setup. In addition, a profound analysis of the complex dynamic behaviour of the rolling tyre is performed. This analysis quantifies the effect of rolling speed, inflation pressure, preload, temperature and excitation amplitude on the dynamic behaviour of the rolling tyre. Based on the experimentally obtained findings, a structural tyre model is developed and validated in this dissertation. The model is based on a three-dimensional flexible ring, suspended on an elastic foundation. The model accurately predicts the response of the tyre belt, wheel, air cavity and their mutual interactions up to approximately 300 Hz. This makes the proposed tyre model applicable for vehicle structure-borne noise and vibration simulations.

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Order Code

Code: 09D06