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An investigation of the disturbing sound elements of automotive exhaust noise will be discussed (e.g. whistle, raspy, boom). The investigation is performed in three steps. First a sound catalogue is established with a definition for each disturbing element. Subsequently, for each of these disturbing elements a metric is determined. This paper is focused on the final step, which consists in determining the link between each metric and the construction of the exhaust system. The case of a whistle generated by a perforated tube will be discussed. Another element that will be discussed is putter, which occurs and the end of the coast-down, before the transition to idle rpm.

This paper describes a method to determine an objective measure of disturbing sounds of automotive exhaust noise (e.g. booming noise, whistle, flow noise,…). First, a disturbing sound catalogue is established. Then the approach used to make the different disturbing sounds measurable is presented. By making the perception of the disturbing sounds objective, it becomes easy to determine when they appear and to what extent. Finally, the contribution of this research in the framework of the global integration of sound quality in the design process of exhaust systems will be discussed.