Designing partial enclosures to minimize airborne sound transmission

摘要

Enclosures are a very common way to reduce noise emissions from machinery. However,rnenclosures display complex acoustic behavior that is difficult to predict. Boundary elementrnsimulation was used to better understand the airborne transmission path for a partialrnenclosure. Sources considered included a point source and a diesel engine. Insertion lossrnwas used as the performance measure to evaluate the effect of several different enclosurernconfigurations. Results indicate that the most important factors affecting enclosurernperformance are the opening size, amount of absorption, and the relationship between thernsource directivity and the opening location. It is notable that insertion loss was lessrnsensitive to enclosure or source size, or to absorption location.