Experimental research on the sound source data of the duct system

The source Data of a duct system is studied in theoretical, experimental and numerical ways respectively. The physical meaning of the source data is obtained through theoretical derivation. The experimental model of two-port acoustic source is established, and the source data have been measured by the method "with an external source". The physical insight of source parameter has been demonstrated through the experimental method. The experimental results have shown that the differences between the source data and acoustic pressures at specific locations inside the duct will decrease gradually as the acoustic boundary condition at the duct openings approximates the ideal boundary condition of total absorption more and more. The larger the sound absorption coefficient is, the smaller the difference is, and more the acoustic propagating mode approximates the traveling wave.