An energy-based control strategy for minimizing the sound field in enclosures.
Peter J. Nashif, Scott D. Sommerfeldt · The Journal of the Acoustical Society of America · 1991
Squared pressure has generally been the quantity chosen to minimize when controlling the sound pressure level (SPL) in enclosures. However, difficulty in selecting the best possible microphone location makes this method unattractive for arbitrary enclosures. As an alternative control strategy, minimizing the total energy density in an enclosure has been investigated. This method is a logical alternative because the total energy in the field is composed of both pressure and velocity components, as opposed to simply a pressure component. Computer simulations and experimental measurements of reducing the SPL in a rigid-walled duct have been conducted to compare the two strategies. The results of the experiments show that minimizing the total energy provides greater attenuation of the total potential energy with the added advantage of being less sensitive to microphone placement than when minimizing the squared pressure.