Abstract
In this paper, a method is presented for modelling of chamber mufflers by four-pole electrical ducts. The basic equations of the electrical ducts as the four-poles are first derived in the paper. Based on the electrical-acoustic analogy, the muffler elements are represented by four-pole electrical ducts. The acoustic pressure is analogous to voltage, while the volumetric velocity corresponds to current. Transmission loss (TL) is selected as a muffler characteristic. Some numerical results are given in the paper for various chamber diameters and lengths. Results are compared to those obtained with other methods.