A pressure-based technique for predicting regenerated noise levles in ventilation systems

On the basis of a method devised by Nelson and Morfey, measured sound power levels generated by a variety of induct spoiler configurations have been collapsed. A method of determining the duct clear area ratio and magnitude of the characteristic dimension coefficient from the measurement of the pressure loss has been devised. The non-dimensional spectra produced have been used to predict the sound power levels generated by single-vane dampers. The predicted levels are in good agreement with measured levels.