Identification of source velocities in presence of correlated sources with the inverse Patch Transfer Functions (iPTF) method

Abstract

The identification of source velocities has been developed through several methods such as Nearfield Acoustical Holography (NAH) or inverse Boundary Element Method (iBEM). However, these methods fail to identify source velocities in presence of disturbing sources and need free field conditions. The inverse Patch Transfer Functions (iPTF) method proposes to overcome this difficulty through the double measurement of pressure and particle velocity fields on the open surfaces of a virtual cavity arbitrarily defined around the source. In the method, measurement and identification surfaces are divided into elementary areas called patches. Source velocities are then obtained from the acoustic field and the Patch Transfer Functions computed by Finite Element Method. The iPTF method can also be applied on complex 3D geometries and measurements can be performed in situ. In the present paper, the basic equations of the method are reminded and an experimental validation on simple source geometry (two baffled pistons) is presented and discussed.

Mathieu Aucejo

Associate Professor

My research interests include inverse problems, vibration control and vibro-acoustics.