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 arernassumed to be on one side of the hologram surface. The present paper describes arntechnique using pressure-velocity measurements and equivalent source method (ESM) forrnseparating wave components crossing the measurement surface in opposite directions,rnwhich makes NAH applications in a bounded noisy environment where there exist sourcesrnon both sides of the hologram surface, possible. The method is flexible in applications,rnstable in computation, and very easy to implement. In the paper, a theoretical descriptionrnof the field separation technique is first given, and then the validities of the field separationrntechnique and its application in NAH are evaluated through numerical simulations and anrnexperiment.