Features of Measuring Acoustic Characteristics of Mufflers Using the Four-Microphone Method

The present paper considers the particularities of measuring the acoustic characteristics of noise silencers based on the method of four microphones and two loads. The document provides a detailed description of the experimental setup and presents the findings from experimental investigations of a noise silencer in the form of a chamber of expansion. These investigations were conducted on the developed installation. The coherence function is used to analyse the influence on the accuracy of the obtained results of the form of the spectrum of the input sound influence used in the measurements. A comparison was made between the experimental data and the calculated results obtained from numerical modelling using the COMSOL Multiphysics software package. The comparison demonstrated a high degree of agreement between the calculated and experimental results.