Experimental verification of sound power determination methods based on radiation matrix

Theoretical foundation of sound power determination from a sound radiating surface using volume velocity and acoustic radiation matrix (ARM) is well established in the literature. However, a detailed experimental investigation of the accuracy of this method over a wide frequency band has not been presented. In this study, the ARM method is analyzed thoroughly to identify factors that can affect the accuracy of the calculated sound power. To do so the acoustic radiation matrix is observed closely as this is the main parameter responsible for the determination of the sound power. Further experiments are performed to calculate the sound power using ARM method and results were compared to the results obtained using the ISO 9614-2. Comparison of these results in wide frequency bands provides insight into the acoustic radiation matrix based on the assumptions made during the modeling of the ARM method. These insights are then used to improve the accuracy of the model with the motivation to imply this method to the insitu measurement of the large building facades.