MicrodB offers a new 3D method based on microphone array for quantification of sound power of complex components.

Contact MicrodB (lien sur adresse mail) to learn more and evaluate the interest of the Generalized Acoustic Holography in your application case.

During the past years, MicrodB has jointly worked with INSA Lyon, Honeywell Turbo Technology, Renault and PSA in research and industrial projects to develop and validate the Generalized Acoustic Holography for accurate sound power quantification. The methodology and results of this work can be found through different publications in international congress:

• CFM 2015 “Measurement of component’s sound power emission on a PSA’s diesel engine by means of 3D acoustic imaging technique and its applications“,
• SIA 2016 “Sound power qualification of a turbocharger in enclosed environment using an innovating acoustic imaging processing: Generalized Acoustic Holography“
• FISITA 2016 “Array based acoustic power measurement, RENAULT pass-by noise“,
• and review PhD Thesis Thibaut LE MAGUERESSE“Approche unifiée multidimensionelle du problème d’identification acoustique inverse”.

The innovation compared to standardized method (sound intensity measurements or sound power determination based on pressure measurements) lays on working:

• In non-specific acoustic environment with microphone array techniques and more realistic transfer functions to back-propagate sound field,
• In 3 dimensions to better fit the complete sound field radiated by noisy object keeping the capability to extract individual radiated sound power by component,
• with an extension of the Bayesian focusing technique estimating the 3D sound source distribution without too much restrictive assumption like planar or spherical acoustic holography.