Abstract
A measuring method for the transfer matrix parameters of acoustic systems by using 3-microphones is described in this report. The acoustic characteristics of engine intake systems are usually analyzed by the transfer matrix method. By using the 3-microphones method, the matrix parameters of unknown systems can be determined experimentally. The matrix parameters of the air cleaner were measured and used to predict the acoustic characteristics of the intake systems. The comparisons were made between predicting results using the matrix parameters and directly measuring results with mean flow. Agreement is fairly good and it suggests that this method can be used to evaluate the acoustic characteristics of intake systems with a low flow velocity.
