For fine, quantitative characterization that can replace standardized measurements using intensity probes coupled with masking, advanced acoustic imaging measurements and methods such as holography or Bayesian focusing can be used to locate and quantify sources finely, and at the same time extract their power levels. In the case of panels for which transparency needs to be defined, measurements will also need to determine the incident field. MicrodB masters both aspects of these measurements: incident and transmitted fields. These can be implemented in coupled acoustic chambers, or directly on vehicles without masking.
To establish a classification of dominant noise zones and noise reduction through their treatment, MicrodB’s tools and expertise make it possible to estimate the contribution of panels at a control point. The method is based on a few seconds’ measurement of the acoustic field using a spherical array, enabling tests to be carried out under real conditions (taxiing, flight, etc.) or in a wind tunnel, thus reducing the cost of using these heavy resources.
Array processing propagates the identified sources both on a flat surface adapted to a panel, and on a 3D mesh of the surface to be characterized (apron, passenger compartment interior, etc.). The zones to be qualified then follow the perfect geometry of the surfaces, for better quality results.