A Review of Recent Progress in Exhaust System Design

Considerable progress has been made in the past several years in the development of improved techniques for exhaust system design. New analytical models now provide an improved understanding of the performance of such important acoustical elements as concentric resonators and plug sections. Evaluation techniques utilizing two channel FFT analyzers enable efficient measurement of transmission loss curves for a wide range of silencing designs. These techniques can be used to verify analytical predictions and evaluate the performance of features that are currently difficult to analyze.