The Problems of Noise of Engines in Different Vehicle Groups

Abstract

<div class="htmlview paragraph">The paper classifies all current automotive engines into four distinct groups relative to engine usage and vehicle noise legislation.</div> <div class="htmlview paragraph">The noise characteristics of the engines in each group are widely different except that at their maximum rated speeds the overall noise levels approach the same value</div> <div class="htmlview paragraph">The sources of noise rank in different importance according to the size and type of engine. Therefore quiet engine design must also vary.</div> <div class="htmlview paragraph">The importance of mechanical noise is emphasised and it is considered that this source could be a limiting factor to future low noise engines.</div>