Acoustic Measurements

Description

The research activity carried out is focused on the development and application of innovative techniques for the localization of acoustic sources based on arrays of microphones, such as near-field Acoustic Holography and Beamforming and the estimation of sound field propagation in three-dimensional environments using analytical (Acoustic Holography) and numerical (BEM and FEM) methods.

The research activity of the Acoustic Measurement lab is aimed at the development of measurement procedures and innovative methods for the characterization of the acoustic emission of components. In particular, innovative procedures are developed by updating and customising existing commercial systems to meet specific application needs, such as, for example, the use of acoustic holography. In other cases, completely new methods are developed to suit measurement needs which are not met by available systems, which is the case, for example, of Beamforming used for the identification of acoustic sources in diffuse and reverberant environments or coherent intensimetry used for the mapping of the acoustic transparency of panels.
The activity is carried out within collaborations with national and international companies, such as CRF- Fiat Research Centre, Bridgestone, Volkswagen, Société de Chemin de Fer, and European funded projects. 
In particular, EU funded projects regarding vibro-acoustics are:

  • ACES (“Optimal Acoustic Equivalent Source Descriptors for Automotive Noise Modelling” GRD1-1999-11202 Growth programme, 5th Framework Programme -UE-1999-2002) in which the Group dealt with the application of near-field acoustic holographic techniques and direct and indirect BEM numerical models for the localization of noise sources in automotive components;  
  • CREDO (“Cabin Noise Reduction by Experimental and Numerical Design Optimisation”, 6th Framework Programme -UE-2006-2009) in which the activity carried out was focused on the development of measurement techniques for the localisation of sound sources in highly reverberant fields, like the inside of aircraft and helicopter cabins. In particular, the Group developed beamforming and coherent intensity techniques based on the correlation between acoustic intensity and a Laser Doppler Vibrometer
  • ENHANCED - joined Experimental and Numerical methods for HumAN CEntered interior noise Design is a European Industrial Doctorate funded by the European Commission within the Marie Sklodowska-Curie actions (Contract PITN-GA-2013-606800). The overall objective of ENHANCED is to create an industrial-oriented educational and research framework for the development of integrated numerical and experimental procedures for the acoustic characterisation and simulation of cabin interior noise addressing specifically the automotive field. More in details ENHANCED aims at developing Experimental Measurement Methods EMM validating NUmerical Models NUM for the characterisation and simulation of interior noise in vehicle cabin and improving HUman Comfort HUC.
Scientific Manager