VEHICLE OVERALL NOISE - ROLLING NOISE ---INTERNOISE 84. INTERNATIONAL COOPERATION FOR NOISE CONTROL. PROCEEDINGS 1984 INTERNATIONAL CONFERENCE ON NOISE CONTROL ENGINEERING, HONOLULU, HAWAII, 3-5 DECEMBER 1984, VOLUMES 1 AND 2.

This short article describes and criticises the propositions for standard test methods to evaluate tyre-road contact noise (rolling noise), made by the Geneva ad hoc "rolling noise" group at the group of rapporteurs on brakes and running gear (grrf). Such methods are thought to be deficient in that they go against current vehicle noise regulations philosophy, and fail to take into sufficient account important parameters such as vehicle geometry and road surface type. Also, the proposed power spectral density (psd) profile of road surfaces required for the tests is very difficult to apply in practice. Methods to overcome these shortcomings are proposed. It is suggested that physical parameters such as acoustical and mechanical impedances may be sufficient to determine the influence of the road surface upon the level of sound emitted. The development of a statistical model of tyre noise which takes into account the effect of tyre width, external diameter, and architecture is also proposed. This would enable manufacturers to decide which tyres needed testing in the first place. For the covering abstract of the conference see IRRD 816933.