The Vertical Response Characteristics of the Non-Rolling Tyre

Abstract

Due to the complexity of the dynamic behaviour of the pneumatic tyre a preliminary study is carried out to determine experimentally the vertical response characteristics of the non-rolling tyre. This approach is further justified because of the general use of the laboratory road simulator in which the excitation is through a non-rolling tyre.

A measurement technique based on the concept of mobility is used to show that the tyre exhibits a fundamental rigid body mode as well as higher tread flexural modes of vibration. Comparisons are then made between the behaviour of a cross-ply and a radial-ply tyre over a range of pressure levels. The results show that there are marked differences between the two types both in the character of the response and the level of damping. The commonly used mathematical model to represent the fundamental mode is shown to be inadequate. A viscoelastic model is proposed, to describe this mode of vibration, which includes frequency-dependent stiffness and damping coefficients. The theory is further developed to predict motion transmissibility across the tyre from the input mobility data.

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