Muffler with Perforates

Application ID: 1843

Reflective mufflers are best suited for the low-frequency range where only plane waves can propagate in the system, while dissipative mufflers with fibers are efficient in the mid- to high-frequency range. Dissipative mufflers based on flow losses, on the other hand, also work at low frequencies.

A typical automotive exhaust system is a hybrid construction consisting of a combination of reflective and dissipative muffler elements. The reflective parts are normally tuned to remove dominating low-frequency engine harmonics, while the dissipative parts are designed to take care of higher-frequency noise.

The muffler analyzed in this model is an example of a complex hybrid muffler in which the dissipative element is created completely by flow through perforated pipes and plates.

This model example illustrates applications of this type that would nominally be built using the following products: