O. Guasch, F.X. Magrans and P.V. Rodriguez. An inversion modelling method to obtain the acoustic power of a car cabin panels in the mid-high frequency range. Proceedings of the 14 Jornada Técnica de Automoción, UPNA-STA. Pamplona (2002).

The Inverse Problem Theory is quite complete mathematical theory that integrate methods for extracting as mcuh information as possible from measured data in order to find the most problable values for a priori unknown physical model. It is based on probability calculus and brings a natural extension of the minimax, least absolute and least square optimization criteria. The theory has found several applications in a wide variety of fields such as mathematics, astrophysics, geophysics, engineering or economy.

In this paper, the theory is applied to reconstruct the medium high frequency acoustic field in the cabin of a Ferrari 456. The acoustic powers of the car cabin panels are obtained by means of sound pressure spectra measurements and with the use of a difuse model of radiation following Lambert's law. Once all the acoustic powers are known, their inlfuence to the acoustic pressure at any point inside the car cabin can be calculated. A careful analysis of the solution has been performed by simulating errors on the measured data in order to obtain correlations among the acoustic poewrs and avoid misleading interpretation of the results. The method has proved encouraging and save a large amount of time when compared with more classical approaches.


ICR es una ingeniería acústica que soluciona problemas de ruido y vibraciones. Trabaja para sectores como el de la construcción, ferrocarril, industrial, automóvil y medioambiente. Investiga (I+D) nuevos métodos para la resolución de problemas vibroacústicos. También diseña software para control de calidad y cálculo de aislamientos e imparte formación en acústica a empresas privadas y colegios oficiales. 
Ingeniería para el Control del Ruido – Barcelona.

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