Estimating vehicle interior noise using room models and sound power

In this article, interior noise of a large commercial truck was modeled with the room equation. This approach assumed that integrated-sleeper truck cabins may be adequately modeled as a practical room. The method is used in architectural acoustics studies, where ray theory and statistical concepts are suitable and where application of complicated wave theory may not be necessary. This simplifies computational requirements, making a semi empirical useful for timely product development. The study employed sound power measurements at thirty-four surface patches encompassing the interior cabin boundary. Each surface patch constituted an individual interior noise source. Predicted and measured results correlated well, demonstrating the capability to estimate driver-position noise level from predicted periphery sound intensity changes.