Sound Field Separation Technique Based on Equivalent Source Method Using Pressure-Velocity Measurements and Its Application in Nearfield Acoustic Holography

摘要

In the conventional nearfield acoustic holography (NAH), all sources of the sound field are assumed to be on one side of the hologram surface. The present paper describes a technique using pressure-velocity measurements and equivalent source method (ESM) for separating wave components crossing the measurement surface in opposite directions, which makes NAH applications in a bounded noisy environment where there exist sources on both sides of the hologram surface, possible. The method is flexible in applications, stable in computation, and very easy to implement. In the paper, a theoretical description of the field separation technique is first given, and then the validities of the field separation technique and its application in NAH are evaluated through numerical simulations and an experiment.