Abstract: The method of simplifying the three-dimensional acoustical model of diesel particulate filter (DPF) is discussed, then the simplified model is put into Sysnoise to do the acoustical analysis in operating condition and the transfer matrix of DPF is found. By using the transfer matrix method the insertion loss in operating condition can be calculated. In an half anechoic laboratory the engine testbed is established, the insertion loss of DPF is measured in the operating condition. The comparison between experimental and calculating results demonstrates the correctness of the acoustical modal, providing theory basis of optimizing the DPF design.

Key words: Diesel particulate filter, Insertion loss, Operating condition, Transfer matrix, Aeronautic gear Bearing chamber Sprayed oil droplets Oblique impact Numerical model Deposited oil film Flow characteristics