Diesel Particulate Filter Analysis Using an Acoustic Transfer Matrix

Application ID: 79781

Diesel particulate filters (DPFs) are designed to remove and filter soot (diesel particles) from the exhaust of diesel engine vehicles. The filters in such systems are typically structured with long, air-filled channels surrounded by a porous medium that retains the soot.

Although the main function of a DPF is filtering the soot in the exhaust flow, the DPF also has acoustic damping properties that relate to the muffler system. The filters typically contain several thousand air channels, which can make the individual modeling of all of the channels computationally expensive.

In this model, the acoustics in a DPF are simulated. A method to reduce the complexity of the computation is presented by obtaining the transfer matrix of the filter itself. The transfer matrix is coupled to the surrounding cavities to obtain the total transmission loss (TL).

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