Industrial applications of the inverse problem theory

The inverse problem theory is based on a bayesian interpretation of the calculation of probabilites. It was developed mostly by geophysicists in their quest to model the interior of the earth using data collected on the surface. The application of the theory to different industrial cases has allowed us to resolve two problems, one with a scientific aspect and the other with a practical aspect. The first problem refers to the desired aim of acoustics, to know the contribution of different noise sources to the overall noise level at a particular point or location and then reduce the noise level. The inverse model has enabled us obtain the acoustic power of the various noise sources in a factory from the measurements of the acoustic fields that they generate. The second problem is being able to carry out these measurements without interfering with the operation of the factory and in a resonable length of time. Inverse models make this possible through their non-intrusive technique and their rapid application. In the case of a car, in a research project for Ferrari, ICR managed to prepare a methodology based on the model inverse theory, which determined the interior noise in the middle to high frequency range. The method reduced the length of time necessary to obtain the acoustic powers of the subsystems from 30 to 2-3 days.

The theory includes the use of various optimization techniques and accurate stability analysis and a way of validating solutions by means of techniques such as resampling.

ICR is an Acoustic Engineering resolving problems of noise and vibrations. ICR works for the railway, car, industry, construction and environmental sectors. The company researches (R+D) new methods to solve vibroacous-tic problems. ICR also designs software for quality control and transmis-sion loss and teaches acoustics to private companies and official colleges.
Ingenieria para el Control del Ruido – Barcelona.

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