A scheme to predict the sound pressure radiated from an automotive exhaust system

A general scheme to predict the sound pressure radiated from an automotive exhaust system is presented. The scheme is demonstrated with a step‐wise computational procedure on a model system comprised of an electroacoustic driver source, an expansion chamber muffler, and a tailpipe radiating to free space. The predicted sound pressure level spectra agree well with the corresponding measured spectra for various test cases with zero mean flow. Also, studies are made of the theoretical effects of variations of the source impedance on the sound pressure radiated from the model system.